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Development of luminescent coordination polymers (LCPs) for effective detection of the environmental pollutants is urgent and important for human health and environmental protection. Three novel Zn-LCPs, {[Zn1(L)(4,4′-bbibp)]–[Zn2(L)(4,4′-bbibp)]}n [YMUN6 (for Youjiang Medical University for Nationalities)], [Zn(L)(1,4-bimb)]n (YMUN7), and [Zn(L)(4,4′-bidpe)]n (YMUN8), were fabricated from flexible dicarboxylic acid 1,3-bis(4′-carboxylphenoxy)benzene (H2L) and different imidazole ligands [4,4′-bbibp = 4,4′-bis(benzimidazol-1-yl)biphenyl, 1,4-bimb = 1,4-bis(imidazol-1ylmethyl)benzene, 4,4′-bidpe = 4,4′-bis(imidazolyl)diphenyl ether] using solvothermal conditions. They were characterized using X-ray diffraction (XRD), infrared (IR), thermogravimetric (TG), powder X-ray diffraction (PXRD), and photoluminescence (PL) spectroscopic techniques. YMUN6 possessed the "ABAB" interpenetrating 2D complanate structure. YMUN7 showed a three-interpenetrating 2D network. YMUN8 displayed a hcb 3-connected 3-fold interpenetrated 2D network. Photoluminescent properties of YMUN6–8 were investigated, and 6–8 served as "turn off" sensors that could detect chlortetracycline (Chl), Ag+, and Cr2O72− in an aqueous solution with simultaneous high efficiency and sensitivity. Notably, the investigation of Ag+ sensing was most focused on lanthanide metal LCPs, and Zn-LCPs have rarely been reported in this direction. Furthermore, selectivity and recyclability were also investigated. [ABSTRACT FROM AUTHOR]

A PCN-222@MXene-based electrochemical aptasensor is fabricated to detect trace oxytetracycline via differential pulse voltammetry. The electrochemical aptasensor has good stability, fine reproducibility, and high selectivity. [Display omitted] • PCN-222 is assembled with MXene nanolayers to form PCN-222@MXene composites. • The electrochemical aptasensor can sensitively detect trace oxytetracycline. • Differential pulse voltammetry is used as the sensing method in this work. Metal–organic frameworks (MOFs) have received lots of attention in the field of electrochemical aptasensors in recent years, but most MOFs have poor conductivity to limit their electrochemical detection performance. Hence, it is still a great challenge to construct excellent MOF-based composites for fabricating outstanding electrochemical aptasensors. In this work, a zirconium–organic framework (PCN-222) is assembled with the MXene nanosheet to obtain a PCN-222@MXene nanocomposite. Due to copious Zr(IV) sites and abound mesopores of PCN-222, and the good conductivity of MXene nanosheets, the PCN-222@MXene nanocomposite is a good functional material to immobilize aptamers. Oxytetracycline (OTC), as an analytic mode, has been widely used in various applications, but the residual OTC brings a series of health and environmental problems. Excitingly, the electrochemical aptasensor based on PCN-222@MXene exhibits more outstanding sensing performance toward OTC via differential pulse voltammetry than many reported sensors, including low limitation of detection, high selectivity, available stability and reproducibility. [ABSTRACT FROM AUTHOR]

The self-assembly of chiral unit forms hydrogen-bonded metal-organic frameworks with multiple level chirality can effectively enhance chiroptical activity. [Display omitted] • Chiral coordination compounds with formula Cd[D-OH-bim] 2 (NO 3) 2 (1-D) and Cd[L-OH-bim] 2 (NO 3) 2 (1-L) were synthesized • The self-assembly of chiral unit forms hydrogen-bonded metal-organic frameworks with multiple level chirality. • The aggregation of chiral coordination unit with multilevel chirality can effectively enhance chiroptical activity. In this work, a pair of chiral coordination compounds with formula as Cd[D-OH-bim] 2 (NO 3) 2 (1-D) and Cd[L-OH-bim] 2 (NO 3) 2 (1-L) (L-OH-bim = (L)-2-(1-Hydroxyethyl)benzimidazole; D-OH-bim = (D)- 2-(1-Hydroxyethyl)benzimidazole) are synthesized for circular polarization luminescence (CPL). Single crystal X-ray diffraction (SCXRD) results show that the 1-D and 1-L contain chiral Cd[OH-bim] 2 (NO 3) 2 units composed of Cd center and chiral OH-bim ligand (D- or L-OH-bim) as well as NO 3 –. The self-assembly of these chiral units by hydrogen bonding interaction generates a 3D hydrogen-bonded framework containing multiple chirality, such as chiral ligand, helical chain, chiral spatial arrangement and chiral framework (chiral space group and chiral topology). The bulk phase with multilevel chirality shows enhanced circular dichroism response and obvious CPL than that of the organic ligands as well as Cd[OH-bim] 2 (NO 3) 2 unit. [ABSTRACT FROM AUTHOR]

Two novel 3D functional CPs based on the flexible 4-(4-carboxylphenylmethylthio)benzoic acid ligand have been successively synthesized. Complex 2 that is composed of Co(II), 4,4′-H 2 cpmb and 1,3-Hbib ligand displays good photo-degradation and adsorption properties for the organic dyes. Two new coordination polymers (CPs) based on transition metals, namely [Ni 2 (4,4′-cpmb) 2 (4,4′-bbibp) 2 (H 2 O) 4 ] n (1) and [Co(4,4′-Hcpmb)(1,3-bib)] n (2) (flexible 4,4′-H 2 cpmb = 4-(4-carboxylphenylmethylthio)benzoic acid, rigid 4,4′-bbibp = 4,4′-bis(benzoimidazo-1-ly)biphenyl and 1,3-Hbib = 1,3-bis(1-imidazo-1-ly)benzoic acid), have been designed and successfully synthesized under solvothermal conditions, which have been characterized by elemental analysis, infrared spectra, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that 1 features a 3D supermolecular structure in ABAB mode by H bonds (O⋯H⋯O) with a 2-fold interpenetrating sql topology framework and 2 displays a 3D supermolecular framework by H bonds (O⋯H⋯O) with a rarely fes topology. Moreover, the photo-degradation and dye adsorption properties of CPs 1 – 2 have been investigated. Importantly, 2 shows good photo-degradation and dye adsorption properties. [ABSTRACT FROM AUTHOR]

Five novel Cd(II) metal–organic frameworks (Cd-MOFs), namely [Cd6(L)4(1,3-bit)2(H2O)4]n (1), [Cd(HL)(4,4′-bbibp)]n (2), [Cd3(L)2(1,4-bimb)2(H2O)2]n (3), [Cd(HL)(4,4′-bidpe)]n (4) and [Cd3(L)2(1,1′-bbi)(H2O)4]n (5) (flexible H3L = 5-(2-carboxylphenoxy)isophthalic acid, rigid 1,3-bit = 1,3-bis(l-imidazoly)toluene, rigid 4,4′-bbibp = 4,4′-bis(benzoimidazo-1-ly)biphenyl, semi-flexible 1,4-bimb = 1,4-bis(imidazol-l-ylmethyl)benzene, semi-flexible 4,4′-bidpe = 4,4′-bis(imidazolyl)diphenyl ether, and flexible 1,1′-bbi = 1,1′-(1,4-butanediyl)bis(imidazole)) were synthesized employing a rational design approach under solvothermal conditions and further characterized by elemental analysis, IR spectra, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. Diversity architectural topologies have been generated by adjusting the N-donor ligands. They exhibit varied structures: 1 displays an unprecedented 6-nodal (3,3,4,4,8,8)-c 3D topology framework with the point Schläfli symbol of (3·4·5)2(32·42·52·66·78·87·9)(32·63·7)(4·64·8)(410·611·87)(43)2; 2 shows a 2-fold interpenetrating 4-connected cds topology with the point Schläfli symbol of (65·8); 3 exhibits an unprecedented 2-nodal (3,8)-c 3D topology network with the point Schläfli symbol of (42·5)2(44·56·610·75·82·9); 4 shows a 4-connected sql topology with the point Schläfli symbol of (44·62); 5 displays a tfz-d topology 2-nodal (3,8)-c 3D network with the point Schläfli symbol of (43)2(46·618·84). The luminescence studies reveal that MOFs 1–5 display highly sensitive and selective fluorescence sensing towards Fe3+ cations, CrO42− anions and molecular acetone. Meanwhile, the targeted dye adsorption properties of MOFs 1–5 are investigated. [ABSTRACT FROM AUTHOR]

The synthesis and characterization of two new porphyrin-based porous organic polymers (POPs) via Sonogashira cross-coupling reaction and leverage the two obtained POPs is reported for the fabrication of electrochemical aptasensors to detect kanamycin at an ultratrace level. The resultant electrochemical aptasensor demonstrates a high linear relationship with the logarithmic value of kanamycin concentration in the range 5 × 10−5–5 μg/L with the limit of detection of 17.6 pg/L or 36.3 fM. During the analysis of real samples from milk and river, a relative standard deviation of less than 4.39%, and good recovery values in the range 97.0–105% were obtained. [ABSTRACT FROM AUTHOR]

• Two novel Co-mofs show unparalleled topologies frameworks. • Co-MOF 2 has proposed ultra-high adsorption capacity on CR (capacity: 810.7 mg g-1). • Co-MOF 2 has excellent adsorption potential in CR from the real wastewater. Removal the hazards of Azo organic dyes from waterbody through porous heterogeneous materials is considered as a low-cost and high-efficient method. Intriguingly, two metal organic frameworks (MOFs), {[C o 3 (L) 3 (H 2 O)]·3.5(C 4 H 2 O 2)} n and [Co 4 (L) 4 (bit) 2 ] n designated as MOF 1 and 2 , have been synthesized through the traditional solvothermal method. MOF 2 exhibits significant removal effect on organic dye (congo red (CR)) from waterbody owing to more imidazole rings in the structure than 1. After optimizing the experimental conditions, the highest adsorption capacity (810.7 mg g-1) and high removal rate (97.28%) of 2 are obtained in 500 ppm CR solution. Pseudo second-order kinetics and Langmuir isotherms more accurately described the adsorption process of 2. In addition, 2 exhibits high recyclability, stability and adsorption performance through a simple organic solvent release system. Moreover, 2 also exhibits high adsorption performance in real wastewater. The possible mechanism of selective adsorption involves the π-π stacking interaction, hydrogen bond, synergistic effect of electrostatic interaction and pore filling. All the bench experiments have indicated that 2 is a promising potential sorbent in the practical wastewater treatment and CR dyes recovery. Preliminary screening displays that 2 has proposed ultra-high adsorption capacity on CR, and its maximum adsorption capacity could reach 810.7 mg g-1. In addition, the adsorption process in accordance with the Langmuir isothermal model and the second-order kinetic model. Even in dye mixtures, CR could be selectively adsorbed, and the removal rate maintained 88% after six cycles. Finally, through dye classification, infrared analysis, SEM and BET tests, it was supposed that the adsorption of CR by 2 with the synergistic of electrostatic, π-π stacking and hydrogen bond interaction. In actual river water, the maximum adsorption capacity is as high as in bench results in deionization system. Therefore, our work provided 2 has excellent adsorption performance and potential application in CR extraction from the real wastewater. [Display omitted] [ABSTRACT FROM AUTHOR]

Graphical abstract Two 3D functional coordination polymers based on the rigid 1,3,5-tris(1-imidazolyl)benzene ligand and cobalt transition metal have been successively synthesized. Complex 2 shows good photo-catalysis properties for the photo-catalytic degradation of mixed organic dyes (MB/MV/RhB). Abstract Two novel coordination polymers (CPs) based on cobalt transition metal, namely {[Co(tib) 2 ]·2HNO 3 } n (1) and {[Co(tib)(4,4′-sbdc)]·H 2 O} n (2) (tib = 1,3,5-tris(1-imidazolyl)benzene, H 2 sbdc = 4,4′-stilbenedicarboxylic), have been designed and successfully synthesized under solvothermal conditions, which were characterized by elemental analysis, infrared spectra, powder X-ray diffraction (PXRD), thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Single-crystal X-ray diffraction analysis reveals that complex 1 features a stable 2D → 3D supramolecular frameworks through H-bonds with a rare (3,6)-connected kgd topology and complex 2 displays a 2-fold interpenetrating (2,4)-connected new topology with the point Schläfli of (44·62)(42). Importantly, the photo-catalytic properties of complexes 1 – 2 have been investigated, and then complex 2 is a good photo-catalyst for the degradation of mixed organic dyes (MB/MV/RhB). [ABSTRACT FROM AUTHOR]

Four novel Co(ii) metal–organic frameworks, namely [Co2(4,4′-cpmb)2(1,1′-bbi)2]n (1), [Co(4,4′-cpmb)(4,4′-bbibp)]n (2), {[Co(4,4′-cpmb)(tib)]·3(H2O)}n (3) and {[Co(4,4′-sdc)(tib)]·(H2O)}n (4) (flexible 4,4′-cpmb = 4-(4-carboxylphenylmethylthio)benzoic acid, rigid 4,4′-sdc = 4,4′-stilbenedicarboxylic acid, flexible 1,1′-bbi = 1,1′-(1,4-butanediyl)bis(imidazole), rigid 4,4′-bbibp = 4,4′-bis(benzoimidazo-1-ly)biphenyl and rigid tib = 1,3,5-tris(1-imidazolyl)benzene) were synthesized employing a rational design approach under solvothermal conditions and further characterized by elemental analysis, IR spectra, thermogravimetric (TG) analysis, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. The four Co-MOFs display different interpenetrated structures due to the flexibility of O/N-donor ligands. Single-crystal X-ray diffraction analysis reveals that complex 1 displays a 6-fold interpenetrating class Ia net with the point Schläfli symbol of (66). Complex 2 shows a 3-fold interpenetrating sqc5 net with the point Schläfli symbol of (66·8). Complexes 3 and 4 exhibit a 2-fold interpenetrating 4-connected sql topology with the point Schläfli symbol of (44·62). The photodegradation properties and dye adsorption capacity of complexes 1–4 are investigated, and the framework integrity of complexes 1–4 can be well-retained. [ABSTRACT FROM AUTHOR]

Three new Zn metal organic frameworks (Zn-MOFs), {[Zn 2 (L)[H (1,4-bmib)]]·1.5(H 2 O)} n (1), {[Zn 2 (HL) (3,5-bip) 2 ]·(H 2 O)} n (2), and {[Zn 2 (HL) (4,4′-bbibp) 2 ]·4(H 2 O)} n (3), have been first synthesized based on a flexible H 5 L ligand with ether functional group (C–O–C) and successfully characterized (semi-flexible H 5 L ​= ​3,5-bis(3,5-dicarboxylphenoxy)benzoic acid, flexible 1,4-bmib ​= ​1,4-bis(2-methylimidazol-1-yl)butane, rigid 3,5-bip ​= ​3,5-bis(1-imidazolyl)pyridine, and rigid 4,4′-bbibp ​= ​4,4′-bis(benzoimidazo-1-ly)biphenyl). Zn-MOFs 1 – 3 are unique topological networks. As multi-responsive fluorescent sensing materials of 1 and 3 , they show excellent response and sensitivity for Fe3+, CrO 4 2− and Cr 2 O 7 2−, and tetracycline (TC) in aqueous system. The quenching mechanism is also investigated in detail. Three novel topological Zn metal organic frameworks, namely, {[Zn 2 (L)[H (1,4-bmib)]]·1.5(H 2 O)} n (1), {[Zn 2 (HL) (3,5-bip) 2 ]·(H 2 O)} n (2), and {[Zn 2 (HL) (4,4′-bbibp) 2 ]·4(H 2 O)} n (3) have been successfully synthesized and characterized. Zn-MOFs 1 and 3 afford selectivity and excellent sensitivity towards Fe3+, Cr 2 O 7 2−, CrO 4 2−, and TC in aqueous system. [Display omitted] • Three novel topological Zn metal organic frameworks have been successfully synthesized and characterized. • Zn-MOFs 1 – 3 are unique topological networks. • Zn-MOFs 1 and 3 show excellent response and sensitivity for Fe3+, CrO 4 2− and Cr 2 O 7 2−, and TC in aqueous system. [ABSTRACT FROM AUTHOR]

• Two novel polynuclear Cd-MOFs have been successfully synthesized and characterized. • 1 shows a rare 3D 2-nodal (5,10)-c fit network based on tetranuclear [Cd 4 (µ 3 -O) 4 (COO) 10 ]2− unit. • 2 displays an interesting 2D → 3D interdigitating and penetrating structure unique topological framework. • 1 – 2 can serve as excellent multi-responsive luminescent sensors for TC, Cr 2 O 7 2− and Fe3+ ions. • The 2 -coated fluorescent test papers can be used to detect TC, Cr 2 O 7 2− or Fe3+ ions in water system. Assembled from O-containing pentacarboxylate acid ligand (H 5 L), two new water-stable Cd organic frameworks (Cd-OFs), namely {[Cd 4 L 2 ]·1,4-bmib} n (1) and [Cd 4 L 2 (1,4-bimb) 3 ] n (2) have been solvothermally synthesized and further characterized. Cd-OF 1 possesses a rare 2-nodal (5,10)-c fit topological 3D network based on tetranuclear [Cd 4 (µ 3 -O) 4 (COO) 10 ]2− unit. Cd-OF 2 displays an interesting 2D → 3D interdigitating and penetrating structure with a unique 3-nodal (3,3,5)-c topological framework. The luminescence performance of Cd-OFs 1 – 2 has been investigated based on their high thermal and good chemical stability. These results reveal that 1 – 2 can serve as multi-responsive luminescent sensors for tetracycline (TC), Cr 2 O 7 2− and Fe3+ ions with excellent selectivity and highly sensitive sensing ability. Interestingly, the Cd-OF 2 -coated fluorescent test papers can be used to detect TC, Cr 2 O 7 2− and Fe3+ ions in water system, and thus may have promising application prospect. [ABSTRACT FROM AUTHOR]

In this study, we have synthesized six new coordination polymers (CPs), namely {[Cu 6 (3,5-bip) 6 (H 2 O) 12 (SO 4) 6 ]·3H 2 O} n (1), [Co(3,5-bip) (H 2 O) 3 (SO 4)] n (2), {[Cu(1,3-bit) 2 (H 2 O) 2 ]·2(NO 3)} n (3), {[Cu 2 (1,3-bit) 2 (1,3-bcbb) 2 ]·4(H 2 O)} n (4), [Cu(4,4′-bibp) (H 2 O) (NO 3) 2 ] n (5), [Cu(4,4′-bibp) (4,4′-Hsbdc)] n (6) via solvothermal methods. The structures of these new CPs have been characterized by elemental analysis, FTIR, TG analysis, PXRD and single crystal X-ray diffraction techniques. Meanwhile, the title CPs are explored for adsorption of organic dyes, i.e., anionic dyes (congo red (CR), and methyl orange (MO)) and cationic dye (methylene blue (MB)) considered extensively as water colorants pollutants. Worth noting, complex 3 can adsorb anionic dyes (CR and MO) quickly; complex 6 shows great performance in CR adsorption. Kinetic study reveals that the adsorption process is performed via pseudo-second-order reaction. The dye removal investigations of complexes 3 and 6 support that ions exchange and H-bonding interactions between CPs and target organic dyes are significant factors, heavily affecting dye adsorption. They have excellent potential in wastewater treatment. The first author and corresponding authors made the greatest contribution to this article, while the other authors contributed similarly. Image 1 • Six new coordination polymers (CPs) have been hydrothermally prepared and characterized. • Complexes 3 could selectively adsorbs anionic dyes (CR and MO) quickly from aqueous solution with good repeat-ability. • Complex 6 shows great dye adsorption performance for CR with good repeat-ability in aqueous system. • This work highlights the advantages of 2D CPs as excellent hazardous dye adsorbents. [ABSTRACT FROM AUTHOR]

• Porous materials Co-MOFs can efficiently remove azo dyes (CR and OIV). • The effects of structure and surface charge of dye on adsorption were studied. • The adsorption process was researched by kinetics, isotherm and thermodynamics. • The Co-MOFs shows high-efficiency adsorption performance in artificial seawater. Two novel Co(Ⅱ)-MOFs synthesized under solvothermal conditions, namely [Co 3 (L) 2 (bimb) 2 (H2O) 2 ] n (OUC-1) and [Co 2 (L)(OH)(H 2 O) 2 ] n (OUC-2) (bimb = 1,4-bis(lmidazol)butane, H 3 L = 3-(3,5-dicarboxylphenoxy)-5-carboxylpyridine), were used to remove Congo Red and Orange Ⅳ from aqueous environment, respectively. The influential parameters of the temperature and pH of solution, initial dye concentration, the structure and charge of dye on the adsorption performance were investigated. It is found that the dye with proper structure (i.e. organic groups favorable for adsorption, such as -NH 2 , -SO 3 H, etc, proper distance between the groups, linear structure and more benzene rings), richer negative charges, smaller molecular weight facilitates faster adsorbed. The intermittent operation experiments were adopted to make the adsorption isotherm and kinetics data of OUC-1 and OUC-2 accurately described by Langmuir isotherm and pseudo second-order kinetics. The intra-particle diffusion model indicates the adsorption process is controlled by the intra-particle diffusion and other adsorption stages. Two adsorbents release azo dyes easily through simple organic solutions and maintain high adsorption capacity after 8 cycles. Moreover, OUC-1 and OUC-2 also exhibit high adsorption performance in artificial seawater. The mechanism of selective adsorption involves pore filling, π-π stacking interaction, hydrogen bond and electrostatic interaction. [ABSTRACT FROM AUTHOR]

• Six new Zn-MOFs were prepared, and there were four Zn-MOFs showing unparalleled topologies frameworks. • The six Zn-MOFs displayed fluorescence quenching effect on Fe3+ ions and tetracycline antibiotic in aqueous solution. • Complex 1 as a bifunctional fluorescent probe material, showed highly sensitive and selective fluorescence quenching property. Either reduced or excessive metal ions level in biological systems might induce serious metabolic diseases, and the abuse of antibiotics has seriously affected the environment. Despite the significant progress in the development of fluorescence probes over the past decade, the ability to sensitively and selectively detect these metal ions and antibiotics remains a pressing problem. Herein, we demonstrated some effective fluorescence probes for sensing metal ions and antibiotics, six novel and stable Zn(II) metal-organic frameworks (Zn-MOFs), namely [Zn 3 (L) 2 (1,4-bimb) 3 ] n (1), [Zn 3 (L) 2 (4,4′-bbibp) 2 (H 2 O) 2 ] n ·2(CH 3 CN) (2), [Zn(HL)(4,4′-bidpe)] n (3), [Zn(HL)(4,4′-bibp)] n (4), [Zn(HL)(3,5′-bip)] n (5) and [Zn(HL)(1,3′-bit)] n (6) (flexible H 3 L = 5-(2-carboxylphenoxy)isophthalic acid, semi-flexible 1,4-bimb = 1,4-bis(imidazol- l -ylmethyl) benzene, rigid 4,4′-bbibp = 4,4′-bis(benzoimidazo-1-ly)biphenyl, semi-flexible 4,4′-bidpe = 4,4′-bis(imidazolyl)diphenyl ether, rigid 4,4′-bibp = 4,4′-bis(imidazolyl)biphenyl, rigid 3,5′-bip = bis(1-imidazoly)pyridine and rigid 1,3-bit = 1,3-bis(l-imidazoly)toluene) have been successfully synthesized via solvothermal conditions and further characterized by IR spectra, elemental analysis, powder X-ray diffraction (PXRD), single-crystal X-ray diffraction, and thermogravimetric (TG) analysis. These Zn MOFs have exhibited diversely architectural frameworks via the assistant N-donor ligands: 1 , 2 , 5 and 6 show unprecedented topological networks, 1 affords a 3-nodal (3, 4, 4)-connect 2-fold interpenetrating topology structure with the Point Schläfli symbol of (5·6·7·92·10) 2 (5·6·7) 2 (5·73·82), 2 shows a 3-nodal (3, 4, 6)-c topology with (4·82) 2 (42·811·10·12)(86), 5 and 6 display 3-nodal (2, 2, 4)-c topology with (2·44·6)(2)(4). 3 and 4 show 4-connected sql topology with (44·62). As expected, Zn MOFs 1 - 6 not only revealed a highly sensitive and selective fluorescence quenching effect on Fe3+ ions in aqueous solution, but also toughed the interference of a myriad of other metal ions. It is noteworthy that they could also be used as luminescent sensors for detection of tetracycline antibiotic. [ABSTRACT FROM AUTHOR]

• Two novel Zn (II) coordination polymers have been successfully prepared and characterized. • An unprecedented topology with 4-nodal 3, 3, 5, 6-c framework. • Chem-sensors with excellent performance for the detection of Fe3+ ions or TC, high selectivity, extra sensitivity. Environmental issues are the great challenge that human beings are suffering from. Development in coordination polymers (CPs) provides a great platform for tracing hazardous substance by fluorescence detection. In this work, two novel Zn-CPs, namely [Zn(1,1′-bbi)(C 2 O 4)] n (1) and [Zn 3 (1,1′-bbi)(L) 2 (H 2 O)] n (2) (flexible 1,1′-bbi = 1,1′-(1,4-butanediyl)bis(imidazole), and H 3 L = 5-(2-carboxylphenoxy)isophthalic acid) have been synthesized under solvothermal conditions, and further characterized by IR spectra, elemental analyses, thermogravimetric (TG) analyses, powder X-ray diffraction (PXRD), and single-crystal X-ray diffraction. Complex 1 displays a sql topological framework; complex 2 shows an unprecedented 4-nodal (3,3,5,6)-c topological network with Point Schläfli symbol (4·5·6) 2 (42·52·62·73·9) 2 (42·52·64·7·84·9·10)(42·5) 2. CPs 1 – 2 possess good application prospect due to their high thermal, and chemical stability. The selective and sensitive fluorescence sensing of 1 – 2 have been investigated towards Fe3+ ions and tetracycline in detail. [ABSTRACT FROM AUTHOR]

Three novel Zn(II)-based coordination polymers (Zn-CPs), namely {[Zn(1,3,5-tib) 2 (H 2 O) 2 ·2(NO 3)} n (1), [Zn(1,3,5-tib)(4,4′-saba)] n (2), and {[Zn(1,3-bit)(4,4′-cpmb)]·0.5(1,3-bit)} n (3), have been hydrothermally synthesized and successfully characterized by single crystal X-ray diffraction (1,3,5-tib ​= ​1,3,5-tris(1-imidazolyl)benzene), 4,4′-Hsaba ​= ​4-(4-sulfoacid)-benzoic acid, 1,3-bit ​= ​1,3-bis(l-imidazoly)toluene, and 4,4′-H 2 cpmb ​= ​4-(4-carboxylphenylmethylthio)benzoic acid). Structural analysis reveals that complex 1 manifests a 2D planar structure with an unprecedented (2,4)-c topological network. Complex 2 and complex 3 display a 3-c fes and 6-fold classical Ia interpenetrated dia framework with 4-c (66) sqc6 topology framework, respectively. Among the three complexes, CPs 1 and 2 demonstrate excellent performance for Azo organic dyes' adsorption, for which the selectivity and kinetics have been comprehensively studied. CPs 3 shows great luminescent intensity in aqueous solution. It is further applied as a fluorescence sensor to detect Fe3+ cation, Cr 2 O 7 2− anion, and tetracycline antibiotic. Three Zn(II) coordination polymers (Zn-CPs), {[Zn(1,3,5-tib) 2 (H 2 O) 2 ·2(NO 3)} n (1), [Zn(1,3,5-tib)(4,4′-saba)] n (2), and {[Zn(1,3-bit)(4,4′-cpmb)]·0.5(1,3-bit)} n (3), have been hydrothermally prepared. While 1 – 2 could be applied as a CR dye adsorbent, and 3 could be as a potential sensing material for detection of Fe3+, Cr 2 O 7 2−, and TC. Image 1 • Three new Zn (II) coordination polymers (Zn-CPs) have been hydrothermally prepared and characterized. • Complexes 1 – 2 could selectively removal CR dye molecule from aqueous solution. • Complex 3 could be used to detect Fe3+, Cr 2 O 7 2−, and TC with high selectivity, anti-interference, and repeat-ability. [ABSTRACT FROM AUTHOR]

Recently, lots of organic dye adsorbents were introduced; the pollution of water bodies caused by adsorbents was an urgent problem to be solved. The modified metal–organic frameworks with magnetic properties provided a great platform for solving this disadvantage. In this study, a novel magnetic material Fe3O4@PmPD–[Co-BT] (Co-BT = [Co(bcpo)0.5(tib)(H2O)2]n, bcpo = 2,5-bis(4-carboxylphenyl)-1,3,4-oxadiazole, tib = 1,3,5-tris(1-imidazolyl)benzene)) was prepared using Fe3O4 modified by mPDs (mPD = m-phenylenediamine). This material was successfully characterized by transmission electron microscopy (TEM) and powder X-ray diffraction (PXRD), and it was confirmed that Co-BT was adhered to the Fe3O4 surface by PmPDs. The dye adsorption performance of magnetic Fe3O4@PmPD–[Co-BT] was investigated in detail with selectivity, capacity, thermodynamics and kinetics studies, and with respect to influence factors including the pH value, solvent types, and ionic strength. Notably, the saturated adsorption capacity of magnetic Fe3O4@PmPD–[Co-BT] for CR dyes could reach 347.8 mg g−1. The dye removal mechanism was investigated by zeta potential analyses and Fourier transform infrared (FTIR) spectroscopy. [ABSTRACT FROM AUTHOR]

Two novel Co (II)‐ coordination polymers (CPs) based on 2,5‐bis(4‐carboxylpheny)‐1,3,4‐oxadiazole (bcpo), namely [Co/(bcpo)0.5(tib)(H2O)2]n (1) and [Co (bcpo)0.5(bidpe)(H2O)2]n (2) (tib = 1,3,5‐tirs(1‐imidazolyl)benzene, bidpe = 4,4′‐bis (imidazolyl)diphenyl ether) have been synthesized under solvothermal conditions and characterized by powder X‐ray diffraction (PXRD), single crystal X‐ray diffraction, photochemistry as well as electrochemistry. The investigation of the photo‐degradation methyl blue and methyl violet (MB, MV) properties of CPs 1–2 demonstrates that CP 1 shows great performance for the degradation of MB, and CP 2 could efficiently degrade MB/MV. Meanwhile, the possible photo‐degradation mechanism has been proposed and explored. Simultaneously, electrochemistry studies show that both CPs 1 and 2 can catalyze water oxidation under an alkaline condition at the potential around 1.20 V vs. NHE with relatively low overpotential of 330–510 mV vs. NHE. [ABSTRACT FROM AUTHOR]

A novel metal organic framework, namely, {[Zn3(btc)2(bimmb)2.5]·2H2O·CH3CN}n (1) (btc = 1,3,5-benzenetricarboxylic acid), bimmb = 1,4-bis(imidazol-l-ylmethyl) benzene), has been reasonably designed, successfully solvothermally synthesized, and characterized. The complex is characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, thermogravimetric analysis, and powder X-ray diffraction. Complex 1 exhibits a 5-nodal 3,3,4,4,6-connected 3D framework with a (5·6·7)2(52·8)2(52·92·102)2(53·82·9)2(54·62·72·84·92·11) topology. The photodegradation studies reveal that complex 1 displays highly sensitive photodegradation sensing toward methylene blue, rhodamine B, and methyl violet under UV irradiation. [ABSTRACT FROM AUTHOR]

One novel metal–organic frameworks (MOFs) has been successfully synthesized under solvothermal condition and characterized by single crystal X-ray diffraction. The electrochemical behaviors of the complex have been studied in 0.1M KOH. Photocatalytic properties have been confired by degrading rhodamine B (RhB), methylene violet (MV), and methylene blue (MB). Possible degradation mechanism and the effect of the variables have been discussed. One novel metal–organic frameworks (MOFs) constructed by one angular ligand and 5-aminoisophthalic acid, namely {[Ni(L)(bpt)(H 2 O)]·2H 2 O} n (H 2 L = 5-aminoisophthalic acid, bpt = 2,5-bis(4-pyridyl)-1,3,4-thiadiazole) has been designed and successfully synthesized under solvothermal condition. This compound was characterized by single crystal X-ray diffraction, elemental analysis, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction analysis reveals that the compound possesses a uninodal 3-connected 3D (three-dimensional) hcb topology framework with the point symbol (63). The thermal stabilities and electrochemical behavior in the solid state of the compound have been investigated in detail. Moreover, the photocatalytic degradation of the compound has been investigated. The results show photocatalytic activity of the compound for three dyes is MB > MV > RhB. [ABSTRACT FROM AUTHOR]

Two hypercrosslinked microporous carbazole-based polymers are prepared through a Friedel−Crafts coupling approach, which can effectively immobilize aptamers to prepare electrochemical impedimetric aptasensors with the outstanding sensing performance toward penicillin. [Display omitted] • Two porous carbazole-based polymers are prepared via a Friedel−Crafts method. • Electrochemical aptasensors can sensitively detect penicillin. • This aptasensor has fine stability, good repeatability, and available reproducibility. Two hypercrosslinked microporous carbazole-based polymers (namely C-POP-1 and C-POP-2) were prepared through an efficient Friedel − Crafts coupling approach. Both samples have different porous structures via regulating the length of two-node linear organic blocks. Meanwhile, they have lots of attractive advantages, such as large surface area, splendid stability and conjugate skeleton. As a research case, the aptasensor based on C-POP-2 with the large porous skeleton exhibits the excellent electrochemical detection behavior toward penicillin (PCL). More importantly, this aptasensor can quantitatively detect trace PCL in actual test samples. [ABSTRACT FROM AUTHOR]

Abstract Two metal-organic frameworks (MOFs) {[Zn(L 1)]·2DMA·H 2 O} n (1) and {[Zn(L 2)]·2DMA·H 2 O} n (2) (H 4 L 1 /H 4 L 2 = 5,5'-(1,4/3-xylylenediamino) diisophthalic acid) were synthesized under solvothermal conditions and structurally characterized. Both of the crystals are isomorphs and featuring the dia topological 3D interpenetrated framework, and constructed with Zn(II) cations and two isometric aromatic tetracarboxylate ligands, respectively. The optical adsorption and diffuse-reflection spectrum show that the two crystals could be the potential UV photocatalytic materials, and photocatalytic studies exhibit great degradation activity of three organic dyes (methylene blue (MB), Rhodamine B (RhB) and Methyl orange (MO)). Graphical abstract Two dia isomorphic Zn-MOFs are synthesized based on two isomeric semi-rigid aromatic tetracarboxylate acids. The study of optical property and photocatalysis property of 1 and 2 indicates both are good candidates for the photocatalytic degradation of Rhodamine B, Methylene Blue and Methyl Orange. Image 1 [ABSTRACT FROM AUTHOR]

Three novel coordination polymers (CPs) based on transition metals, namely {[Cu(bpt)2(H2O)2]·2NO3}n (1), {[Cu(bpt)(SO4)(H2O)]·H2O}n (2) and [Cd(bpt)(SO4)]n (3) (tib = 1,3,5-tris(1-imidazolyl)benzene and bpt = 2,5-bis(4-pyridyl)-1,3,4-thiadiazole), have been designed and successfully synthesized under solvothermal conditions. All of these three polymers were characterized by single crystal X-ray diffraction, elemental analysis, IR spectra, powder X-ray diffraction (PXRD), and thermogravimetric analysis (TGA). Single-crystal X-ray diffraction analysis reveals that complex 1 possesses a uninodal 4-connected 3D (three-dimensional) spl topology framework with the point symbol (44·62). Complex 2 showing a 1D zigzag chain, which is connected by a sulfate anion to form a 2D network, is further assembled into a 3D supramolecular structure, whereas complex 3 displays a 3D 3,5-connected tfz-d topology with chiral inorganic 2-D layers. Moreover, the photocatalytic degradation of the three complexes has been investigated. Significantly, complex 1 is the best photocatalyst for the degradation of organic dyes (MB/MV/RhB). [ABSTRACT FROM AUTHOR]

Two novel Co(II) coordination polymers (CPs), formulated as {[Co 2 (L)(H 2 O) 6 ]·H 2 O} n (1) and {[Co(bidpe) 2 (H 2 O) 2 ]·H 2 L·3.5H 2 O} n (2) (H 4 L = 3,5-bis(3,4-dicarboxylphenoxy)pyridine, bidpe = 4,4′-bis(lmidazolyl)diphenyl ether), have been solvothermally synthesized and characterized by various techniques. Complex 1 exhibited a 2D→3D supramolecular framework through H-bonds with a point symbol of (12)(4·125)(4) topology. However, with the introduction of additional bibpe ligand, the H 4 L ligand did not coordinate with Co(II) ions in the synthesis of 2. Complex 2 possessed a 1D [Co(bidpe) 2 ] n loop line, which was further linked by H-bonds to form a 3D supramolecular architecture. In particular, both the CPs exhibited efficient photocatalytic activities towards the degradation of methyl violet (MV) under low-energy irradiation of a 125 W Hg lamp, which could be attributed to their high efficiencies in generating ·OH radicals. Moreover, the variable-temperature magnetic analyses indicated that 1 and 2 exhibit antiferromagnetic behavior between the adjacent Co(II) ions. Two novel Co(II)-CPs are applied to the UV-light-driven degradation of methyl violet (MV) with small dosage and low-energy irradiation. [Display omitted] • Two novel Co(II)-CPs under solvothermal condition in one-step, for the first time, were synthesized. • The obtained Co(II)-CPs can act as efficient and recyclable photocatalysts for the UV-light-driven degradation of methyl violet with small dosage and low-energy irradiation. • The obtained Co(II)-CPs exhibit antiferromagnetic coupling between adjacent central Co(II) ions. [ABSTRACT FROM AUTHOR]

The atmospheric concentration of carbon dioxide (CO 2) is gradually rising every year, resulting in the increasing global temperature along with thorny environmental and health issues. Up to now, considerable attention has been focused on the design and expansion of excellent heterogeneous catalysts for chemical transformation of CO 2 into high value-added chemicals. Covalent organic frameworks (COFs) and their hybrid materials as a rapidly developing class of porous crystalline materials have been synthesized to capture and utilize CO 2 as a carbon resource for multiple chemicals, such as cyclic carbonate, propiolic acid, oxazolidinone, benzimidazole and so on. Herein, we give a comprehensive summary of COFs and their hybrid materials for chemical transformation of CO 2 in recent five years. Meanwhile, some representative examples are highlighted and analyzed in detail. Finally, this review also discusses opportunities and challenges in the research area. This review provides COFs-based catalysts for chemical fixation of CO 2 into valued chemicals in the last five years. According to skeleton structure and composition, these COFs and their composites are well divided into four major categories: non-metallic COFs, metallic COFs, metal nanoparticle@COFs, and ionic COFs. [Display omitted] • It is a comprehensive review of COFs and their hybrid materials for chemical transformation of CO 2 in recent five years. • COFs-based catalysts are divided into four major categories for CO 2 utilization. • The opportunity, challenge, and prospect are further discussed in this review. [ABSTRACT FROM AUTHOR]

The as-synthesized PCN-222(Fe) nanosheet can efficiently immobilize aptamers to fabricate an electrochemical aptasensor, which is used as an efficient platform for impedimetric sensing toward tobramycin. [Display omitted] • A PCN-222(Fe) nanosheet is prepared successfully. • It can efficiently immobilize aptamers to fabricate an electrochemical aptasensor. • It is used as an efficiently impedimetric sensor toward tobramycin. A zirconium metal-organic framework nanosheet, namely PCN-222(Fe) NS, is prepared using [5,10,15,20-tetrakis(4-carboxyphenyl)porphyrinato]-Fe(III) chloride and Zr clusters, which is further investigated in detail by various technologies. The as-synthesized PCN-222(Fe) NS can efficiently immobilize aptamers to construct an electrochemical aptasensor for impedimetric sensing toward tobramycin (TOB). The fabricated electrochemical aptasensor can sensitively monitor TOB with outstanding specificity, fine long-term preservation, acceptable repeatability as well as good actual usability. [ABSTRACT FROM AUTHOR]

Metal–organic frameworks (MOFs) have a good designability, a well-defined pore, stimulus responsiveness, a high surface area, and a controllable morphology. Up to now, various MOFs have been widely used as nanocarriers and have attracted lots of attention in the field of drug delivery and release because of their good biocompatibility and high-drug-loading capacity. Herein, we provide a comprehensive summary of MOF-based nanocarriers for drug delivery and release over the last five years. Meanwhile, some representative examples are highlighted in detail according to four categories, including the University of Oslo MOFs, Fe-MOFs, cyclodextrin MOFs, and other MOFs. Moreover, the opportunities and challenges of MOF-based smart delivery vehicles are discussed. We hope that this review will be helpful for researchers to understand the recent developments and challenges of MOF-based drug-delivery systems. [ABSTRACT FROM AUTHOR]

A new complex, Ni(C 22 H 26 N 2 O 10 S 2 )·2CH 3 OH, with a sexidentate (N 2 O 4 ) symmetric bis-Schiff base ligand (C 22 H 26 N 2 O 10 S 2 = 1,2-bis(2-methoxy-6-formylphenoxy)ethane-2-aminoethane-sulfonic acid) has been synthesized and characterized by physico-chemical and spectroscopic methods. The X-ray crystal structure shows that the Ni(II) atom of the complex is six-coordinated by two nitrogens from C N groups, two oxygens from ether groups and two hydroxyl oxygens from sulfonic acid groups in the mono-ligand, forming a distorted octahedral geometry. Theoretical study of the complex is carried out by density functional theory (DFT) method and the B3LYP method employing the 6-3l+G* basis set. Moreover, the complex proved to be good candidate for the photocatalytic degradation of methylene blue. [ABSTRACT FROM AUTHOR]

An easy prepared probe, BHMMP, was designed and synthesized, which displayed a significant fluorescence enhancement (over 38-fold) and obvious color change in the recognition of Al3+. The binding ratio of probe BHMMP to Al3+ was determined as 1:1, according to Job plot. The binding mechanism was fully clarified by the experiments, such as FT-IR spectrum, ESI–MS analysis, and 1H NMR titration. A DFT study further confirmed the binding mode of BHMMP to Al3+. The limit of detection (LOD) for Al3+ was determined as low as 0.70 µM, based on the fluorescence titration of BHMMP. Moreover, the results from real sample experiments, including real water samples, test papers, and cell images, well-demonstrated that BHMMP was capable of sensing Al3+ in environmental and biological systems. [ABSTRACT FROM AUTHOR]

A novel 3D Co-MOF based on the semi-rigid 3,5-bis(3,5-dicarboxylphenoxy)benzoic acid ligand have been successively synthesized. YMUN 9-D collected from programmed heat treatment of YMUN 9 displays excellent OER electrochemical activity. [Display omitted] Cobalt metal organic frameworks (Co-MOFs), as promising potential electrocatalyst materials, have been extensively investigated owing to high catalytic active center, uniform catalytic site, large specific surface area, adjustable pore. A new Co-MOF, namely, {[Co 2 (L)(4,4′-bbibp) 2 ]·4(H 2 O)} n [ YMUN 9 (YMUN for Youjiang Medical University for Nationalities)], has been synthesized based on semi-rigid dicarboxylic acid and rigid imidazole ligands (H 2 L = 3,5-bis(3,5-dicarboxylphenoxy)benzoic acid, 4,4′-bbibp = 4,4′-bis(benzimidazol-1-yl)biphenyl). YMUN 9 displays a 3D framework through by means of single-crystal X-ray diffraction (SC-XRD). In order to present the structure more clearly, YMUN 9 can be defined as a 3D 2-nodal (4,4)-connected network with the point symbol of {4·85}2{42·104} through topology analysis. YMUN 9-D has been obtained based on YMUN 9 through a new strategy that of programmed heat treatment of YMUN 9. The oxygen evolution reaction (OER) electrochemical activity of YMUN 9-D has been investigated through cyclic voltammetry (CV), linear scanning voltammetry (LSV), chronopotentiometry (CP), and electrochemical impedance spectroscopy (EIS), in 0.1 M KOH electrolyte. The investigated results revealing that YMUN 9-D has a prominent overpotential of 273.9 mV (at J = 10 mA·cm−2), and keeps great chemical stability until 1000 mins. The Tafel slope of YMUN 9-D is 141.9 mV·dec−1 and its double layer capacitance is found to be 32 mF·cm−2. Compared to other MOFs materials, YMUN 9-D displays similar or superior electrocatalytic performance. [ABSTRACT FROM AUTHOR]

Two novel Ni(II) CPs have been successfully synthesized, which could be good candidates for the photocatalytic degradation of organic dyes. • Synthesis of two different Ni(II) coordination polymers by introduction of carboxylic acid ligands. • Frame structure and photodegradation properties of the two complexes have been discussed. • The possible mechanism of photocatalytic degradation of dyes is explored. Two different novel coordination polymers were synthesized under hydrothermal conditions, namely {[Ni(bibp) 3 (H 2 O) 2 ]·2NO 3 ·0.5H 2 O} n (1), [NiL(bibp)] n (2) (H 2 L = 3,3′-azodibenzoic acid, bibp = 4,4′-bis(imidazolyl)biphenyl). Complex 2 is based on the introduction of carboxylic acid ligands on complex 1. These two polymers were characterized by single crystal X-ray diffraction, IR spectra, elemental analysis, powder X-ray diffraction (PXRD), and thermogravimetric (TG) analysis. Single crystal X-ray diffraction analysis showed that complex 1 formed a 3D structure by weak force. Complex 2 possesses a uninodal 4-connected 3D (three-dimensional) sql topology framework with the point symbol (44·62). In addition, the photocatalytic degradation properties of the two complexes are investigated. Significantly, complex 1 is a good photocatalyst for the degradation of organic dyes (RhB/MO), complex 2 is a good photocatalyst for the degradation of organic dyes (MB). And the possible photodegradation mechanism was proposed and explored. [ABSTRACT FROM AUTHOR]

Four novel Zn(ii) metal–organic frameworks (MOFs) including {[Zn(L)0.5(bimb)]·2H2O·0.5(CH3)2NH}n (1), {[Zn(L)0.5(bimmb)]·2H2O}n (2), {[Zn(L)0.5(btdpe)]·H2O}n (3), and [Zn(L)0.5(bidpe)]n (4) (H4L = 5,5′-(1,4-xylylenediamino) diisophthalic acid, bimb = 1,4-bis(imidazol-1-yl)-butane, bimmb = 1,4-bis(imidazol-1-ylmethyl)benzene, btdpe = 4,4′-bis(4H-1,2,4-triazol-4-yl)diphenyl ether, and bidpe = 4,4′-bis(imidazolyl)diphenyl ether) were solvothermally prepared and further characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, thermogravimetric (TG) analysis and powder X-ray diffraction (PXRD). Single-crystal X-ray diffraction analysis showed that complex 1 features a 3-fold interpenetrated bbf topological framework with the Schläfli symbol of (64·82)(66)2. Complex 2 displayed an unprecedented 2-nodal (4,4)-connected 3D framework with the Schläfli symbol of (86), while complexes 3 and 4 showed 3-nodal (2,4,4)-connected (4·8·104)2(4)2(84·10·12)-unprecedented frameworks. Luminescence studies revealed that complexes 1–4 can be used as high selectivity luminescence sensors for sensing Fe(iii) cations, Cr(vi) anions (Cr2O72− and CrO42−) and nitroaromatic compounds. Furthermore, a possible sensing mechanism was investigated in this paper. [ABSTRACT FROM AUTHOR]

Two novel luminescent coordination polymers, namely, {[Zn(tmlb)(H2tmlb)]·H2O}n (1) and [Zn(tmlb)(bbibp)]n (2) ((bbibp = bis(benzoimidazo-1-ly)biphenyl), H2tmlb = (1H-1,2,4-triazol-1-yl)methylenebis(benzoic acid)), have been rationally designed and successfully solvothermally synthesized. Complexes 1 and 2 have been characterized by elemental analysis, IR spectroscopy, single-crystal X-ray diffraction, thermogravimetric (TG) analysis and powder X-ray diffraction (PXRD). Complex 1 possesses a 2-fold interpenetrating 3-connected 3D framework with a point symbol of (63) topology. Complex 2 exhibits a two-fold interpenetrating uninodal 4-connected 3D framework with a (65·8) topology. The luminescence studies reveal that complexes 1 and 2 display highly sensitive and selective luminescent sensing towards Cr(vi) (CrO42− and Cr2O72−) anions, and complex 2 displays highly sensitive and selective luminescence sensing towards Fe(iii) cations. In addition, photocatalytic studies show that complex 1 could be a good candidate for the photocatalytic degradation of methylene blue (MB), and complex 2 could be a good candidate for the photocatalytic degradation of methylene violet (MV) and Rhodamine B (RhB). [ABSTRACT FROM AUTHOR]

Two novel Ni(II)-based monomeric complexes are applied to the UV-light-driven degradation of methyl violet (MV). [Display omitted] Two Ni(II)-based monomeric complexes with the formulas of [Ni(dbb)(H 2 O) 2 ] (1) and [Ni 2 (H 2 dbb) 2 (xda)(H 2 O) 2 ] (2) (H 2 dbb = 6,6′-di(benzimidazol-2-yl)-2,2′-bipyridine, H 4 xda = 5,5′-(1,4-xylylenediamino) diisophthalic acid) have been successfully synthesized under solvothermal conditions. Structural analysis revealed that the discrete monomers of 1 and 2 extend into high-dimensional networks through intermolecular hydrogen bonds, π···π stacking interactions and weak intermolecular interactions. As novel photocatalyst materials, 1 and 2 exhibited active performance towards the degradation of methyl violet (MV) under UV irradiation. Besides, the cyclic experiments indicated that 2 was stable and reusable, enabling it to be potential candidates for dye-containing wastewater treatment. The possible mechanism of the photocatalytic performance was also investigated in detail. Moreover, the magnetic susceptibility measurements of 1 and 2 demonstrated that week antiferromagnetic interactions were operative between the Ni(II) ions. [ABSTRACT FROM AUTHOR]

Three novel Mn(II)/Co(II)-based 3D metal-organic frameworks (MOFs), namely {[Mn 2 (L)(tib)(H 2 O)]·3DMA·4H 2 O} n (1), {[Co 2 (L)(bipd) 2 ]·3H 2 O} n (2) and {[Co(L) 0.5 (bimb)]·3H 2 O·0.5O 2 } n (3) (H 4 L ​= ​5,5'-(1,4-xylylenediamino) diisophthalic acid, tib ​= ​1,3,5-tris(1-imidazolyl)benzene, bipd ​= ​3,5-bis(1-imidazoly)pyridine, and bimb ​= ​1,4-bis(lmidazol)-butane), have been successfully synthesized using the mixed-ligand as functionalized organic linker. The structural characterization revealed that both MOFs 1 and 2 exhibited an unprecedented 4-nodal 3D framework that enriching crystal engineering, while MOF 3 featured a 2-nodal three-interpenetrating bbf topology framework with a Schläfli symbol of (64·82)(66) 2. The title MOFs have been exploited as photocatalysts for degradation of methylene blue (MB), methyl violet (MV) and malachite green (MG). The photocatalytic results demonstrated that MOFs 2 and 3 exhibited efficient photocatalytic abilities to degrade the three aromatic dyes under UV irradiation. The possible catalytic mechanism was also explored and discussed in detail. Moreover, the variable-temperature magnetic analyses indicated that MOFs 1 – 3 exhibited weak antiferromagnetic behavior between Mn(II)/Co(II) ions. [Display omitted] • Three novel Mn(II)/Co(II)-based 3D MOFs under solvothermal or hydrothermal condition in one-step, for the first time, were synthesized. • The MOFs 2 and 3 act as efficient heterogeneous photocatalyst for degradation of three aromatic dyes. • The possible catalytic mechanism was explored and discussed in detail. • MOFs 1 – 3 exhibit antiferromagnetic coupling between neighboring central ions. [ABSTRACT FROM AUTHOR]

In this work, five novel Cd/Zn-based MOFs with different topological framework, namely {[Cd(bimb)(Hbipa)]·H 2 O} n (1), {[Cd 3 (dimb) 3 (bipa) 2 (H 2 O) 2 ·2H 2 O} n (2) , [Cd(bimd)(Hbipa)(H 2 O)] n (3) , {[Zn(bipd)(Hbipa)]·H 2 O} n (4) and [Zn(bimb)(Hbipa)] n (5) had been synthesized and characterized. Worth noting, Complex 1 and 2 had effective separation behaviors towards MO and MBE dyes respectively, which could reach the adsorption equilibrium within a quite short time even if there existed another kind of dye in the system. Meanwhile, Complex 3 – 5 showed great performance in CR adsorption. Additionally, Complex 3 – 5 also showed excellent photocatalytic degradation capabilities toward MB and MV dyes under UV irradiation. According to the study, these five metal-organic frameworks can be used as a kind of functional materials in the adsorption and photocatalytic degradation of organic dyes in wastewater. [Display omitted] • Produce novel Cd/Zn -based MOFs that possess novel 3D structure. • Selectively absorb specific aromatic dyes in a mixed aqueous system. • Exhibit efficient photocatalytic degradation abilities towards MB/MV in aqueous solution. [ABSTRACT FROM AUTHOR]

[Display omitted] • Produce novel Co-based MOFs that possess analogous layered stacked structure. • Require only 1.2 V@2.93 mA cm−2 and 1.5 V@2.78 mA cm−2 for full water splitting. • Exhibit efficient photocatalytic degradation abilities towards MB/MV in aqueous solution. Two novel Co-MOFs constructed from aromatic polycarboxylic acid named {[Co(tib) 2 (bimb) 2 ]·4H 2 O} n (tib = 3-((4-(1H-1,2,4-triazol-1-yl)benzyl)oxy)benzoic acid, bimb = 1,4-bis(imidazole-1-ylmethy) benzene) and {[Co 2 (bipa) 4 (bibp) 6 ]} n (bipa = 2-(4-carboxy-2-nitrophenoxy)-6-nitroterephthalic acid, bibp = 4,4′-bis(imidazolyl) biphenyl), have been synthesized under solvothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, IR spectra, powder X-ray diffraction (PXRD), thermogravimetric analysis (TG) as well as electrochemistry. The single-crystal X-ray diffraction analysis indicates that Co-MOF 1 exhibits an uninodal net with a (65·8) topology, whereas Co-MOF 2 exhibits an uninodal 4-connected framework with a (44·62) topology. The electrochemistry studies demonstrate that both of the two Co-MOFs can behave as the efficient electrocatalysts for water oxidation in a mild neutral system at the potential around 1.20 V vs. NHE with comparatively low overpotential (η) for Co-MOF 1 and 2 of 337–541 mV vs. NHE. Moreover, the two Co-MOFs also show good photocatalytic degradation capabilities toward MB/MV dyes under UV irradiation, and the mechanism studies demonstrate that the main active species are · OH radicals. Therefore, these bi-functional Co-MOFs materials can be treated as convenient and efficient catalysts for the oxygen evolution reaction and aromatic dyes degradation. [ABSTRACT FROM AUTHOR]

• A stable 3D Cd-MOF based on π-electron rich ligands was successfully synthesized and characterized. • The Cd-MOF can not only sensitively detect CHL through luminescence quenching, but also exhibit good adsorption capability toward CHL in aqueous solution. • The good adsorption capability makes the antibiotic contact with the framework more sufficiently which enhances the sensing efficiency. An efficiently selective sensor for aquatic antibiotic detection based on a photoluminescent cadmium metal–organic framework (Cd-MOF) is researched in this work. The novel and simple luminescent MOF that composed from a π-electron rich ligand bip (3,5-bis(1-imidazol) pyridine) and H 3 L (2-nitro-5-(4-carboxy-2-nitrophenoxy) isophthalic) was synthesized in hydrothermal condition and characterized. Single crystal X-ray diffraction analysis demonstrated that it had an uncommon 2-nodal (3,6)-connected 3D framework with a (32·4)(34·46·53·62) topology, which could be formulated as [{[Cd 2 (HL) 2 (bip) 2 ·H 2 O} n. Benefiting from its unique framework, [{[Cd 2 (HL) 2 (bip) 2 ·H 2 O} n can not only respond to the trace quantity of chloramphenicol (CHL) via fluorescence quenching but also show good adsorption capability toward CHL in aqueous solution. The selective response to CHL reached up to the ppb level with high anti-interference ability in aqueous phase, and the effective detection of antibiotics had been theorized by Density Functional Theory (DFT) calculation for energy bands of H 3 L and antibiotics, which revealed that the cooperation influence on photo-induced electron transfer (PET) process and fluorescence inner filter effect (IFE) made CHL show more sensitive luminescence responses than other experimental antibiotics. Moreover, because of its specific interactions with analytes and relatively high porosity, the pre-enrichment makes the antibiotic fuller contact and interact with the framework, which improves the overall sensing efficiency towards CHL appreciably. Stemming from the abuse, antibiotics have been considered as the great threat to the health of human race and the sustainable development of society. Therefore, it is extremely important to achieve new technology to detect and absorb antibiotics residues in water. This work proves that metal–organic framework complexes can conform the performance of detecting and removing antibiotic in aqueous environment, that emphasizes the application of luminescent MOFs in contaminant monitoring and removing. [ABSTRACT FROM AUTHOR]

Three novel Cu (II) coordination complexes, formulated as [Cu3(C14H8NO3F)2(CH3COO)2]n (1), [Cu2(C14H9NO3F)2(CH3COO)Cl] (2) and [Cu(C14H8NO3F)(CH3OH)2] (3), have been synthesized by 3‐Fluoroanthranilic acid, Salicylaldehyde and Cu (II) salt as sources in different reaction conditions and characterized by single crystal X‐ray diffraction, X‐ray powder diffraction, IR spectroscopy and elemental analysis. Single‐crystal diffraction analysis revealed that the complexes exhibited different coordination modes and conformations which were linked into multidimensional networks through some weak interactions. The biological activities vary greatly on account of the different Cu (II) numbers among the three complexes. In order to discuss the bioactivities, the complexes have been screened for antimicrobial activities against E. coli and S. aureus, antitumor activities against A549 (human lung cancer cells), Hela (human cervical cancer cells) and HepG‐2(human liver hepatocellular carcinoma cells). Their interactions with calf thymus DNA were investigated by UV–visible and fluorescence spectrometry, as well as viscosity measurements. Interestingly, 1 (the rare 3‐core Cu (II) coordination polymer) shows great antibacterial activities and highest DNA binding affinities. Antitumor studies revealed that complex 1 also exhibited highest activity. [ABSTRACT FROM AUTHOR]