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The exquisite combination of [In4(μ3-OH)2(COO)10(DMF)(H2O)2] clusters and H5CPDD generated a highly robust nanoporous MOF with high catalytic performance in the cycloaddition reaction of epoxides with CO2 and Knoevenagel condensation.

The structural engineering of complex WNiM–WNi LDH (M = Se, S, or P) was firstly developed by in situ growth on Ni foam and subsequent selenization, sulfation and phosphorization for use in overall water splitting and the urea oxidation reaction.

A porous 3D multifunctional Zn-MOF (1), namely {[Zn2.5(DDPP)(OH)(H2O)]•H2O•1.5DMF}n (H4DDPP = 3,5-di(2',5'-dicarboxylphenyl)pyridine, DMF = N,N-dimethylformamide) was solvothermally synthesized by the reaction of H4DDPP ligand and Zinc salts. 1 exhibits a high adsorption performance for N2 (246.2 cm3 g-1 at 77 K) and CO2 (116.1 cm3 g-1 at 273 K) as well as excellent selective separation for CO2/CH4 (V:V = 0.5:05) and CO2/CH4 (V:V = 0.05:0.95) with the selectivity coefficiens are 79.3 and 25.4 at 298 K and 1 bar, respectively. Meanwhile, 1 shows a great performance for H2O vapor sorption and the uptake amount of H2O vapor is 281.9 cm3 g-1 (at 298 K and P/P0 = 0.99), which is comparable to that reported in the literatures. Furthermore, 1 has excellent separation ability for H2O vapor in H2O/CH3OH mixed vapor and the selectivity of 1 for H2O/CH3OH (V:V = 0.1:0.9) and H2O/CH3OH (V:V = 0.05:0.95) is 254.6 and 94.9 at 298 K and 1 bar, repectively. More importantly, Grand Canonical Monte Carlo (GCMC) simulation shows that the reason for the good adsorption capacity of 1 for CO2 and H2O vapor is attributed to the pore structure of 1 and the interaction between the coordinated H2O molecules and μ3-OH- in 1 and CO2 or H2O molecule. In addition, 1 shows sensitive sensing ability for nitrofurantoin (NFT) and the detection limit (DL) was 5.3×10-8 M. Moreover, the fluorescence sensing mechanism of 1 for NFT can mainly be attributed to the competitive absorption between the absorption spectrum of NFT and the emission spectrum of 1, the weak interactions between μ3-OH- in 1 and NFT and photoinduced electron transfer from 1 to NFT.

The combination of [In2Tm2(μ2-OH)2(CO2)10(H2O)2] clusters and H5BDCP ligand generated a highly robust nanoporous MOF with high catalytic performance in the cycloaddition reaction of epoxides with CO2 and Knoevenagel condensation.

The efficient separation of CO2 from CH4 and N2 is essential for the upgrading of biogas and reducing carbon emissions in flue gas, but is challenging in the energy industry.

The rare combination of InIII 5p and ZnII 3d in the presence of a structure-oriented TDP6- ligand led to a robust hybrid material of {(Me2NH2)[InZn(TDP)(OH2)]·4DMF·4H2O}n (NUC-42) with the interlaced hierarchical nanochannels (hexagonal and cylindrical) shaped by six rows of undocumented [InZn(CO2)6(OH2)] clusters, which represented the first 5p-3d nanochannel-based heterometallic metal-organic framework. With respect to the multifarious symbiotic Lewis acid-base and Bronsted acid sites in the high porous framework, the catalytic performance of activated NUC-42a upon CO2 cycloaddition with styrene oxide was evaluated under solvent-free conditions with 1 atm of CO2 pressure, which exhibited that the reaction could be well completed at ambient temperature within 48 h or at 60 °C within 4 h with high yield and selectivity. Moreover, because of the acidic function of metal sites and a central free pyridine in the TDP6- ligand, deacetalization-Knoevenagel condensation of acetals and malononitrile could be efficiently facilitated by an activated sample of NUC-42a under lukewarm conditions.

EOR is a semi-reaction of direct ethanol fuel cells (DEFCs), and determines the performance of the DEFCs. Therefore, it is very important for EOR to rationally design an electrocatalyst with excellent activity, stability and CO-resistance. Based on this, we report the synthesis of MOF based composite catalysts by a facile method, which is formed by combining polyaniline hydrogel (PANH) with MOF 1 and carbon cloth (CC). At the same time, the structures of the composites were characterized by XRD, SEM and XPS. Under the optimum conditions, the j value for EOR is 107 mA cm−2 under alkaline conditions at 0.6 V, which indicates that composite 2 has excellent catalytic activity for EOR, and is superior to that of the previously reported nickel-based catalysts for EOR. The Tafel slope and the exchange current density of composite 2 are 88.9 mV dec−1 and 1.95 × 10−5 A cm−2 respectively. In addition, the j value of composite 2 was 65% of the original value after 1000 CV cycles. However, when the electrolyte was changed into the original one (1 M KOH + 1 M EtOH), the j value returned to 74% of the original value. Based on the excellent electrocatalytic performance, good stability and anti-CO poisoning, composite 2 is expected to be an economic, efficient and CO poisoning resistant electrocatalyst for EOR.

Noble metal-based electrocatalysts present high activities for methanol oxidation reaction (MOR), but are limited by their high cost, low stability and poor resistance to carbon monoxide (CO) poisoning. The development of active and stable non-noble metal electrocatalysts for MOR is desired, but remains a challenge. Herein, we report a simple strategy to make copper nanocrystal/nitrogen-doped carbon (Cu/N-C) monoliths, which can serve as active and robust electrodes for MOR. Copper nanocrystals were electrochemically deposited onto a conductive polyaniline hydrogel and calcined to form Cu/N-C monolith, where the active copper nanocrystals are protected by nitrogen-doped carbon. Owing to their extremely high electrical conductivity (1.25 × 105 S cm−1) and mechanical robustness, these Cu/N-C monoliths can be directly used as electrodes for MOR, without using substrates or additives. The optimal Cu/N-C (FT) @500 monolith shows a high MOR activity of 189 mA cm−2 at 0.6 V vs. SCE in alkaline methanol solution, superior to most of reported Cu-based MOR catalysts. Cu/N-C (FT)@500 also presents a better stability than Pt/C catalyst in the long-term MOR test at high current densities. Upon carbon monoxide (CO) poisoning, Cu/N-C (FT)@500 retains 96% of its MOR activity, far exceeding the performance of Pt/C catalyst (61% retention). Owing to its facile synthesis, outstanding activity, high stability and mechanical robustness, Cu/N-C (FT)@500 monolith is promising as a low-cost, efficient and CO-resistant electrocatalyst for MOR.

The target for the self-assembly of functional microporous metal-organic frameworks (MOFs) could be realized by employing ligand-directed and/or template-induced strategies, which prompted us to explore the synthetic technique of d10 secondary-building-unit-based nanoporous frameworks. Here, the exquisite combination of a paddle-wheel [Mn2(CO2)6(OH2)2] cluster and a TDP6- ligand contributes one robust honeycomb framework of {(Me2NH2)2[Mn2(TDP)(H2O)2]·3H2O·3DMF}n (NUC-31; DMF = N,N-dimethylformamide), whose activated state with the removal of associated aqueous molecules characterizes the outstanding physicochemical properties of nanochannels, penta- and tetracoordinated Mn2+ serving as highly open metal sites, rich Lewis base sites (rows of C═O groups and Npyridine atoms), and excellent thermal stability. Moreover, it is worth mentioning that Lewis acid-base sites on the inner surface of the channels in activated NUC-31 successfully form one unprecedented canal-shaped acid-base confined space with evenly distributed open metal sites of Mn2+ and Npyridine atoms as the canal bottom as well as two rows of C═O groups serving as dyke dams. Catalytic experiments displayed that activated NUC-31 could serve as an efficient heterogeneous catalyst for the chemical fixation of CO2 with epoxides into cyclic carbonates under mild conditions. Furthermore, NUC-31 could effectively catalyze the reaction Knoevenagel condensation, which should be ascribed to the synergistic polarization effect aroused from its plentiful Lewis base sites in the confined channel space. Hence, these results demonstrate that the employment of ligand-directed and template-dependent strategies could overcome the self-assembled barriers of functional microporous MOFs and achieve unexpected frameworks.

The reversible redox of methylene blue in organic solvents was highly attractive, yet was rarely reported. In this study, we realized the continuous filtration redox of methylene blue (MB) in dimethylsulfoxide (DMSO) through Fenton-like oxidization by using MnO2 loaded carbonaceous nanofibrous membrane (cPAN-MnO2). The carbonaceous nanofibrous membrane (cPAN) was fabricated through electrospun of polyacrylonitrile and subsequent carbonization. The obtained cPAN nanofibrous membrane showed excellent stability in polar DMSO. MnO2 can be readily coated on cPAN nanofibers through an in situ redox reaction between cPAN and potassium permanganate. The fabricated cPAN-MnO2 membrane exhibited instantaneous reduction property towards MB in DMSO during a gravity-driven continuous filtration process. Interestingly, MB reduction was initiated by a typical Fenton-like oxidization, where hydroxyl radicals were firstly generated from hydrogen peroxide catalyzed by MnO2 in DMSO. Then hydroxyl radicals attacked DMSO to further produce methyl radicals, which resulted in the reduction of MB. In addition, MB reduction process in DMSO was reversible. Our study provides a novel strategy for continuous redox of MB in polar organic solvent and might give new ideas for MB applications.

The exquisite combination of Ba2+ and Zn2+ with the aid of 2,4,6-tri(2,4-dicarboxyphenyl)pyridine (H6TDP) under the condition of solvothermal self-assembly generates one highly robust [Ba3Zn4(CO2)12(HCO2)2(OH2)2]-organic framework of {[Ba3Zn4(TDP)2(HCO2)2(OH2)2]·7DMF·4H2O}n (NUC-27), in which adjacent 2D layers are interlaced via hydrogen-bonding interactions to form a 3D skeleton with peapod-like channels and nano-caged voids. It is worth emphasizing that both Ba2+ and Zn2+ ions in NUC-27 display the extremely low coordination modes: hexa-coordinated [Ba(1)] and tetra-coordinated [Ba(2), Zn(1), and Zn(2)]. Furthermore, to the best our knowledge, NUC-27 is one scarcely reported 2D-based nanomaterial with an unprecedented Z-shaped hepta-nuclear heterometallic cluster of [Ba3Zn4(CO2)12(HCO2)2(OH2)2] as SBUs, which not only has plentiful low-coordinated open metal sites but also has the excellent physicochemical properties including omni-directional opening pores, ultrahigh porosity, larger specific surface area, and the coexistence of Lewis acid-base sites. Just as expected, thanks to its rich active metal sites and pyridine groups as strong Lewis acid-base roles, completely activated NUC-27 displays high catalytic efficiency on the chemical transformation of epoxides with CO2 into cyclic carbonates under mild conditions and effectively accelerates the reaction process of Knoevenagel condensation.

In most instances, the incursion of functional groups on the inner surface of microporous MOFs could undoubtedly result in a significant improvement of their desirable performances, inspired by which one amino-functionalized ligand 2,6-di(3,5-dicarboxylphenyl)-4-aminobenzoic acid (H5DDAC) was designed and synthesized. By employing H5DDAC as the organic linker, the exquisite combination of dinuclear [Eu2(CO2)9] and [Eu2(CO2)6(H2O)2] generated one highly robust microporous framework of {(Me2NH2)4[Eu4(DDAC)3(HCO2)(OH2)2]·8DMF·9H2O}n (NUC-41), which was characterized by hierarchical channels and cage-like voids. Owing to the Lewis acid-base synergistic effect including open metal sites, free oxygen atoms and amino groups, NUC-41 with the aid of cocatalyst n-Bu4NBr exhibited extremely high catalytic activity for the cycloaddition reactions of alkyl epoxides and CO2 under mild solvent-free conditions, especially for epoxides with a smaller size. Furthermore, fluorescence experiments confirmed that the amino-functionalized skeleton of NUC-41 could effectively sense 2,4,6-trinitrophenol in aqueous solution over other nitro analytes including TNP, 2,4-DNP, 4-NP, 2,4-DNT, TNT, 1,4-DNB, 4-NT and NB with KSV and the limit of detection being 8.6 × 104 M−1 and 3.5 × 10−6 M, respectively. Therefore, these results indicate that amino functionalization is an effective strategy to improve and expand the application performance of MOFs, which is critically related to the sustainable development of MOF research in this day and age.

Adding redox-active additives into the electrolyte is an effective way to enhance the performance of pseudocapacitive supercapacitors (SCs). However, the applications of these redox-active additives are limited by their high molecular weight and narrow redox potential window. Herein, we report thiourea (TU) as a catalytic redox-active additive to enhance the performance of a supercapacitor based on copper nanocrystal@nitrogen-doped carbon composites (Cu@N-C), whose capacitance was increased 5.9 fold: from 194 mF cm−2 (15.7 mA h g−1, without TU) to 1154 mF cm−2 (93.3 mA h g−1, with TU). The optimized Cu@N-C-600 electrode presents a wide voltage window (1.8 V) and an extremely high capacitance (9571 mF cm−2, 775.4 mA h g−1 at 5 mA cm−2), which is mainly attributed to the pseudocapacitance from the reversible redox reaction of TU and Cu compounds. The porous nitrogen-doped carbon matrix immobilizes and protects the highly active Cu nanocrystals, and also facilitates charge and mass transfer between the electrode and electrolyte. For the symmetrical SC based on Cu@N-C-600, the energy density and power density reach 314 μW h cm−2 and 2798 μW cm−2, respectively, superior to those of most of the inorganic material-based SCs. This work demonstrates that TU is an efficient redox-active additive to improve the performance of pseudocapacitive SCs.

In terms of documented references, multifunctional MOFs with high catalytic performance could be constructed from the combination of metal cations and polycarboxyl-pyridine ligands, which could eff...

Three Co(II) coordination polymers (CPs), {[Co2(HL)(1,4-bibb)(H2O)]·(CH3CN)·(H2O)}n (1), {[Co4(L)(OH)3(H2O)4]·(1,4-bmib)}n (2) and {[Co6(L)2(OH)2(4,4-biyb)]·(CH3CN)·(H2O)}n (3) have been obtained based on a V-shaped rigid pentacarboxylate ligand (H5L = 3,5-di(2′,5′-dicarboxylphenyl)benzoic acid) and different N-donor ligands. All complexes show 3D structures and contain open carboxyl sites and “accessible metal sites” (AMSs). The gas adsorption experiments show that 1 and 3 have a high H2 adsorption capacity at 77 K and in particular, 3 displays the selective uptake of CO2 over CH4 (14.2 for CO2/CH4 = 0.5/0.5 and 11.0 for CO2/CH4 = 0.05/0.95 under 1 bar at 298 K). Furthermore, anti-ferromagnetic interactions among Co(II) ions are observed in 2.

Two novel 3D Cd-MOFs, namely {[Cd4(HDDCP)2(4,4′-bibp)2(H2O)2]·2.5(DOA)·1.5(H2O)}n (1) and {[Cd2(HDDCP)(1,4-bib)(H2O)]·H2O}n (2), where H5DDCP = 2,4-di(2′,5′-dicarboxylphenyl)benzoic acid, 4,4′-bibp = 4,4′-bis(imidazolyl)biphenyl and 1,4-bib = 1,4-bis(1-imidazoly)benzene, have been solvothermally synthesized and structurally characterized by single crystal X-ray diffraction, elemental analysis (EA), thermogravimetric analysis (TGA) and infrared (IR) analysis. The structural analysis showed that 1 should be regarded as a complex 3D structure based on different 1D Cd–(COO) or Cd–(COO)–(COOH) rods as SBUs, and 2 was viewed as a complex 3D framework based on 1D Cd–(COO) rods as SBUs. MOFs 1 and 2 have good stability in boiling water, and alkaline/acidic aqueous solutions (pH = 4–10). The adsorption measurements indicated that the adsorption capacity of 1 for CO2 and CH4 is greater than that of 2, while the adsorption selectivity of 1 for CO2 is superior to that for CH4, which is attributed to the fact that 1 has a larger porosity and CO2 has characteristics such as a linear structure, larger polarizability and significant quadrupole moment. Furthermore, luminescence studies revealed that both 1 and 2 can be used as a highly selective and sensitive sensor for sensing TNP or Fe3+ ions in aqueous solution or soil samples, and the fluorescence quenching mechanism was explored in this work.

Two novel coordination polymers (CPs), namely, {[Mn2(HL)(DMF)2(H2O)]·H2O}n (1) and {[Mn2(HL)(bibp)(H2O)]·H2O}n (2) {H5L = 2,4-di(2′,5′-dicarboxylphenyl)benzoic acid, bibp = 4,4′-bis(imidazolyl)biphenyl}, were prepared under solvothermal conditions by a mixed-ligand strategy. The structural analysis shows that 1 has a 2D sheet structure with a 2-nodal (3,5)-connected {3·4·5}{32·4·5·62·74} topology, which is further expanded into a 3D supermolecular framework by hydrogen bonding between 2D layers, while 2 exhibits a 3D framework with a 3-nodal (3,3,12)-connected network with a point Schlafli symbol of {3·4·5}2{3·52}2{32·414·510·626·76·86·92}. Moreover, temperature dependent magnetic susceptibility and magnetization measurements revealed that 1 and 2 show weak antiferromagnetic interactions in the Mn chains with different spin topologies, which consist of repeating sequences of –J1J2– for 1 and –J1J2J3J2– for 2. Meanwhile, their superexchange coupling constants obtained using the PHI program further indicate that the magnetic interactions have an –AF–AF– repeating sequence for 1 and an –F–AF–F–AF– repeating sequence for 2, which are attributed to the structural differences of CPs 1 and 2 and are consistent with the magnetic results of structural analysis.

A novel 3D supermolecular metal–organic framework (LMOF 1) {[Cd1.5(TCPB)(phen) 2DMF·3.5dioxane·H2O]}n (H3TCPB = 1,3,5-tris(4-carbonylphenyloxy)benzene and phen = 1,10-phenanthroline monohydrate) was solvothermally synthesized, and after the incorporation of the fluorescent guest molecule rhodamine B (RhB) into the channel of LMOF 1, the composite RhB@LMOF 1 was successfully prepared. Because the channels of LMOF 1 could restrain the dissociation of the RhB aggregates, RhB@LMOF 1 displayed outstanding stability under varying treatment conditions. The solid-state fluorescence spectrum analysis showed that RhB@LMOF 1 possesses the characteristic emissions of both RhB and LMOF 1. Subsequently, the luminescence sensing of RhB@LMOF 1 for six types of pesticides was investigated at room temperature. The results demonstrated that RhB@LMOF 1 could sensitively and selectively recognize organophosphorous (OP) pesticides, which is mainly attributed to the synthetic effect of the internal filter effect (IFE) and photo-induced electron transfer (PET).

RhB@ZrT-1-OH composite was constructed by introduction of Rhodamine B (RhB) into the cages of zirconium-based metal-organic cage that had two fluorescence emission peaks at 466 and 612 nm upon excitation at 327 nm. The dual-emission fluorescence sensor exhibits ultra-high sensitive detection for malachite green (MG) and glycine (Gly) in phosphate buffer solution (pH = 6.86). RhB@ZrT-1-OH as a ratiometric fluorescence probe was applied to detect MG with a low LOD of 0.2879 μM and presented obvious fluorescence visual changes from orange to purple to blue under 254 nm UV-vis lamp. Moreover, RhB@ZrT-1-OH also can be utilized as a "turn-on" fluorescence sensor to recognize Gly with a low LOD of 0.3747 μM and exhibits fluorescence color changes from orange to pink to purple. Notably, the corresponding test papers for sensing MG and Gly were designed for recognize the concentration of MG and Gly. Furthermore, the dual-emission fluorescence sensor can be used to detect MG and Gly in fish and human serum with high sensitivity and reliable. The possible detecting mechanisms of RhB@ZrT-1-OH for sensing MG and Gly were detailedly explored.

The electrolysis of water on a large scale for hydrogen production needs low cost, efficient, and stable electrocatalysts for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OE...

Nanometer-scale phase separation has been explored in an Al60Ge30Mn10 amorphous alloy, where all atomic pairs have negative heats of mixing. Here we use a combination of experimental (X-ray diffraction, X-ray absorption fine structure, small angle X-ray scattering and transmission electron microscopy) and simulation (Ab initio molecular dynamics and reverse Monte Carlo) techniques to resolve the atomic- and micrometer-level structures in the phase-separated Al60Ge30Mn10 amorphous alloy. Three characteristic peaks appear in the structure factor, linking with three kinds of composition fluctuation regions with different heterogeneous structures. The origin of three characteristic peaks is investigated in details and attributed to different atomic pairs. By analyzing the local chemical ordering between main polyhedra, we find that various phases exhibit differences in atomic structure, composition and bond-orientational order. The results obtained here provide atomic-scale understanding of the nanometer-scale phase separation phenomenon in Al60Ge30Mn10 amorphous alloy.

Two novel coordination polymers (CPs), namely {[Cd(TZMB)(1,4-bimb)0.5]·2.5H2O} (1) and {[Co(TZMB)(4,4′-bpy)0.5(μ2-H2O)(DMA)0.5(H2O)]·5DMA}n (2) (H2TZMB = 4,4’-(1H-1,2,4-triazol-1-yl)methylene-bis(benzonic acid), 1,4-bimb = 1,4-bis(imidazol-1-ylmethyl)benene, 4,4′-bpy = 4,4-bipyridine) have been synthesized under the solvothermal method and characterized by single-crystal X-ray diffraction analysis, IR spectra analyses (IR), elemental analyses (EA), powder X-ray diffraction (PXRD) and thermogravimetric (TG) analysis. Single X-ray diffraction analysis reveals that CPs 1 and 2 are 3D frameworks. Furthermore, luminescent measurements showed that 1 has high sensing selectivity for NACs and Fe3+ ions. In addition, the magnetic measurements indicated that 2 exhibits antiferromagnetic interactions between Co ions within the binuclear {Co2(COO)2(μ2-H2O} SBUs.

Two novel adsorbents (AGD301 and ArgD301) were successfully prepared through ring-opening reaction. The adsorption performance and recognition selectivity of AGD301 and ArgD301 towards AuCl4− were ...

Two mononuclear trigonal antiprismatic Co(II) complexes, [Co(CHQ)2Py2] (1) and [Co(NHQ)2Py2] (2) (CHQ = deprotonated 2-methyl-8-hydroxyquinoline, NHQ = deprotonated 2-amino-8-hydroxyquinoline), have been synthesized. Magnetic measurements indicate that complexes 1 and 2 exhibit frequency and temperature dependence of out-of-phase magnetic susceptibility under designated dc field, both behaving as field-induced SIMs. The high-field and high-frequency electron paramagnetic resonance (HF-EPR) studies reveal that the easy-plane magnetic anisotropy of both 1 and 2. Fitting the data of 1 gives that the energy barrier is 60.10 K, obviously higher than 56.44 K for 2, because that the amino group on the pyridine from NHQ has stronger electron-donor ability than the methyl group from CHQ. Magnetic study shows the coexistence of multiple relaxation process mechanisms, including the direct, Raman and Orbach processes for 1 and 2.

Based on H4TPTC and 1,2-bimb/1,3-bimb ligands, four novel complexes, namely, {[Cu(TPTC)(1,2-bimb)2]·4.5(H2O)}n (1), [Cu(TPTC)0.5(1,3-bimb)]n (2), {[Eu2(TPTC)1.5(H2O)4]·4.5(H2O)·2(1,4–DOX)}n (3) and {[Ce(TPTC)(H2O)4]·0.5(H2O)·0.5(1,4–DOX)}n (4) have been constructed under solvothermal conditions [H4TPTC = terphenyl-3,3″,5,5″-tetracarboxylic acid, 1,3-bimb = 1,3-bis (imidazol-1-ylmethyl) benzene, 1,2-bimb = 1,2-bis (imidazol-1-ylmethyl) benzene]. Complexes 1 and 2 are 4-connected 2D networks with the topological types of sql (1) and kgm (2). Complex 3 exhibits a 4, 4, 12-connected network with the point symbol of {432.634}{44.62}{46}2. Complex 4 presents a 3D supramolecular network through hydrogen bonds. The fluorescent properties of complexes 1 and 3 showed that 1 has good fluorescence sensitivity for Cr2O72− and Fe3+ ions in aqueous solutions, and 3 can selectively detect NDVs. Furthermore, possible mechanism for luminescence quenching was also investigated.

Two porous isomorphic 3D Eu(III)/Nd(III) lanthanide metal–organic frameworks (Ln-MOFs), formulated as {[Eu(BCPB)(H2O)(DMF)]·H2O·1.5CH3OH}n (1) and {[Nd(BCPB)(H2O)(DMF)]·2H2O}n (2), have been designed and synthesized by using the tripodal ligand of 3,5-bis(2-carboxy-phenoxy)-benzoic acid (H3BCPB) under solvothermal condition. Complexes 1 and 2 display 3D (3,6)-c net with the point symbol of {4·62}2{42·610·83}. Furthermore, fluorescent measurements showed 1 has highly selective detection for Fe3+ and CrO42− ions in aqueous solution, which shows that it acts as a chemical sensor for detecting Fe3+/CrO42− in aqueous solution. Meanwhile, gas adsorption properties of 1 and 2 have also been studied at different temperatures for N2, CH4 and CO2.

Three 3D metal–organic frameworks (MOFs), namely, {[Cd2(HL)(4,4-bipy)(H2O)]n·H2O} (1), {Zn2(HL)(phen)}n (2) and {Zn2(HL)(2,2-bipy)}n (3) have been synthesized by the V-pattern multi-carboxylic acid ligand H5L (H5L = 3,5-di(2′,5′-dicarboxylphenyl)benozoic acid) and Cd(II)/Zn(II) salts under solvothermal conditions and characterized by X-ray single-crystal diffraction analysis, IR spectrum analysis, thermogravimetric analysis and powder X-ray diffraction analysis. Complex 1 reveals a 3D 4,6-connected net with the point symbol of {43·5·62}{43·53·67·72}. 2 and 3 display a 3D 3-connected net with the point symbol of {103}, respectively. Furthermore, the solid-state luminescence properties of three complexes were researched, 1 and 3 present highly sensitive detection for Fe3+ and Cr2O72− ions in aqueous solution.

In this paper, a novel surface molecularly imprinting technique with higher imprinting efficiency is well designed. It really realizes the synchronization of polymer crosslinking and template imprinting. Then the surface molecularly imprinted polymers (SMIPs) are synthesized using 2-nitrophenol (2-NP), 3-nitrophenol (3-NP), 4-nitrophenol (4-NP), and 4-methylphenol (4-MP) as template, respectively. The physicochemical characteristics of SMIPs are characterized by Fourier transform infrared spectroscopy (FTIR) and elemental analysis. The adsorption performances and recognization selectivity of SMIPs towards template are systematically investigated by batch method. The experimental results show that the SMIPs possess strong adsorption ability and excellent selectivity towards template. The selectivity coefficients of 2-NP, 3-NP, 4-NP and 4-MP relative to 4-chlorophenol (4-CP) are 132.2, 124.5, 157.3 and 37.8, respectively. The adsorption process could be well described by the Lagergren-first-order model and Langmuir-monolayer adsorption model. SMIPs have good chemical stability and reusability. The consecutive adsorption-desorption experiments show that the exhausted SMIPs could be effectively regenerated, and the regenerative SMIPs could be reused without significant reduction of adsorption capacity and selectivity coefficient.