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Two Cd(II) MOFs based on the 1,4-bis[(2-methyl-1H-imidazol-1-yl)-methyl]benzene (1,4-mbix) and succinate (Suc2−) or azelate (Aze2−) ligands have been hydrothermally synthesized, namely, {[Cd2(Suc)2(1,4-mbix)2]·5H2O}n (1) and [Cd(Aze)(1,4-mbix)]n (2). Both MOFs were structurally characterized by single-crystal X-ray diffraction. In MOF 1, the Cd(II) centers are connected by Suc2− and 1,4-mbix to generate a two-dimensional (2D) sql layer with (H2O)5 water cluster. Each 2D layer is further interlocked with two adjacent layers to form a 2D + 2D → 3D parallel polycatenated structure. In MOF 2, when the Suc2− was placed by Aze2−, the Cd(II) centers are connected by Aze2− and 1,4-mbix into a 2D sql layer but without any water molecules. And two 2D sql layers interpenetrate with each other to generate a twofold 2D + 2D → 2D sheet. MOFs 1 and 2 display photoluminescence at 343 nm (λex = 288 nm) and 298 nm (λex = 271 nm), respectively. Luminescent quenching experiments show that 1 and 2 have good ability for detection of Fe3+ in deionized water with low detection limits as 0.58 μM for 1 and 0.54 μM for 2, respectively. Two MOFs also can serve as luminescent sensors for Fe3+ in real tap water and river water. The luminescent quenching of 1 and 2 toward Fe3+ can be attributed to the competition among the absorption of Fe3+ with the excitation and emission of two MOFs. [ABSTRACT FROM AUTHOR]

• Two new 3D Zn(II)/Co(II) CPs of sebacic acid and bbimb ligands are discribed. • CPs 1 and 2 display as 5-fold interpenetrating dia topology. • Both CPs exhibit selective sensing toward tryptophan and norfloxacin via turn-on and red shift effects. Two three-dimensional (3D) coordination polymers (CPs), namely {[M(seb)(bbimb)]·3H 2 O} n (M = Zn for 1 ; Co for 2), were obtained via hydrothermal method using sebacic acid (H 2 seb) mixed with 1,4-bis(benzoimidazol-1-yl)butane (bbimb). The structures of 1 and 2 both display as 3D frameworks with a 5-fold interpenetrating dia topology. CPs 1 and 2 both exhibit excellent luminescent properties and good water stability. Fluorescence sensing experiments demonstrate that 1 and 2 both can selectively detect tryptophan (Trp) and norfloxacin (Nor) in aqueous solution through turn-on and red-shift effect with remarkable anti-interference ability and low detection limits. The limits of detection (LOD) toward Trp-and Nor are 0.07 μ M, 0.08 μ M for 1 and 0.41 μ M, 0.11 μ M for 2. In addition, theoretical calculations and different detection methods were utilized to thoroughly investigate the potential sensing mechanisms for Trp-and Nor. Importantly, 1 and 2 represent two rare examples for sensing both Trp-and Nor via turn-on and red-shift effects. The fluoresence test films of 1 and 2 were prepared which can detect Trp-and Nor quickly with naked eye. [Display omitted] Two new 3D Zn(II)/Co(II) CPs of sebacic acid and bbimb ligands are discribed. CPs 1 and 2 display as 5-fold interpenetrating dia topology. Both CPs were confirmed to be luminescent sensors for detection of tryptophan (Trp) and norfloxacin (Nor) in aqueous solution through turn-on and red shift effects. [ABSTRACT FROM AUTHOR]

• Two new 3D Cd(II)/Co(II) MOFs based on binuclear clusters are described. • MOFs 1 and 2 display as 6-connected mab and bsn networks. • Both MOFs exhibit selective sensing toward Fe3+, Cr 2 O 7 2− and nitrobenzene. Two novel three-dimensional (3D) Cd(II)/Co(II) metal-organic frameworks (MOFs), [Cd 2 (seb) 2 (bbmb)(H 2 O) 2 ] n (1) and {[C o 2 (seb) 2 (bbmb) 2 (H 2 O)]·0·5H 2 O} n (2), were synthesized under hydrothermal conditions based on sebacic acid (H 2 seb) and 4,4′-Bis(benzimidazol-1-ylmethyl) biphenyl (bbmb) ligands. Their crystal structures were structurally characterized by single-crystal X-ray diffraction. MOFs 1 and 2 both show a 3D framework based on binuclear Cd 2 or Co 2 clusters, respectively. In 1, the Cd 2 clusters are linked by seb2- into a 2D corrugated layer. These layers are further connected by bbmb to generate a 3D structure with 6-connected (44·610·8) mab topology. In 2, the Co 2 clusters form a 1D chain through the bbmb ligands, the chains are linked by seb2− into a 3D framework with 6-connected (48·54·63) bsn topology. Fluorescence sensing experiments show that 1 and 2 have good ability for detection of Fe3+, Cr 2 O 7 2− and nitrobenzene (NB) with low detection limits as 5.83 μ M, 1.36 μ M and 2.70 × 10−7M for 1 and 6.19 μ M, 1.40 μ M and 2.90 × 10−7M for 2, respectively. Furthermore, the sensing mechanism was also investigated in detail by various detection means and theoretical calculations. Two new 3D Cd(II)/Co(II) MOFs of 4,4′-Bis(benzimidazol-1-ylmethyl) biphenyl and sebacic acid are described. MOFs 1 and 2 display as rarely reported 6-connected mab and bsn topologies based on the binuclear units. Both MOFs were confirmed to be luminescent sensors for Fe3+, Cr 2 O 7 2− and nitrobenzene. [Display omitted] [ABSTRACT FROM AUTHOR]

Two new three-dimensional (3D) Ni(II) coordination polymers (CPs), namely, {[Ni(L1)2(H2O)2]·(1,5-NDS)}n (1) and [Ni(L2)2(1,5-NDS)]n (2) have been hydrothermally synthesized based on 1,5-naphthalenedisulfonate (1,5-NDS) and two bis(benzimidazole) ligands (L1 = 1,4-bis(1H-benzimidazol-1-yl)butane, L2 = 1,2-bis(benzimidazol-1-ylmethyl)benzene). CP 1 presents a 3D framework with 4-connected 66dia topology. While CP 2 shows a 3D network with 6-connected (412.63) pcu topology. CPs 1 and 2 both exhibit excellent luminescent properties and good water stability. And luminescent sensing experiments reveal that both CPs can detect uric acid (UA) in aqueous solution through the luminescent quenching effect, and they also can detect tryptophan (Trp) in aqueous solution with red-shift and turn-on luminescent effect. The detection limits toward UA and Trp are 1.30 and 0.92 μM for 1, and those are 1.20 and 1.30 μM for 2, respectively. Furthermore, the luminescence sensing mechanisms were studied via PXRD patterns, UV–Vis spectra, lifetimes and theoretical calculations. The luminescence test films of 1 and 2 were also prepared for visual detection of UA and Trp. [ABSTRACT FROM AUTHOR]

• Two new 3D Cd(II)/Co(II) MOFs based on binuclear clusters are described. • MOFs 1 and 2 display as 6-connected mab and bsn networks. • Both MOFs exhibit selective sensing toward Fe3+, Cr 2 O 7 2− and nitrobenzene. Two novel three-dimensional (3D) Cd(II)/Co(II) metal-organic frameworks (MOFs), [Cd 2 (seb) 2 (bbmb)(H 2 O) 2 ] n (1) and {[C o 2 (seb) 2 (bbmb) 2 (H 2 O)]·0·5H 2 O} n (2), were synthesized under hydrothermal conditions based on sebacic acid (H 2 seb) and 4,4′-Bis(benzimidazol-1-ylmethyl) biphenyl (bbmb) ligands. Their crystal structures were structurally characterized by single-crystal X-ray diffraction. MOFs 1 and 2 both show a 3D framework based on binuclear Cd 2 or Co 2 clusters, respectively. In 1, the Cd 2 clusters are linked by seb2- into a 2D corrugated layer. These layers are further connected by bbmb to generate a 3D structure with 6-connected (44·610·8) mab topology. In 2, the Co 2 clusters form a 1D chain through the bbmb ligands, the chains are linked by seb2− into a 3D framework with 6-connected (48·54·63) bsn topology. Fluorescence sensing experiments show that 1 and 2 have good ability for detection of Fe3+, Cr 2 O 7 2− and nitrobenzene (NB) with low detection limits as 5.83 μ M, 1.36 μ M and 2.70 × 10−7M for 1 and 6.19 μ M, 1.40 μ M and 2.90 × 10−7M for 2, respectively. Furthermore, the sensing mechanism was also investigated in detail by various detection means and theoretical calculations. Two new 3D Cd(II)/Co(II) MOFs of 4,4′-Bis(benzimidazol-1-ylmethyl) biphenyl and sebacic acid are described. MOFs 1 and 2 display as rarely reported 6-connected mab and bsn topologies based on the binuclear units. Both MOFs were confirmed to be luminescent sensors for Fe3+, Cr 2 O 7 2− and nitrobenzene. [Display omitted] [ABSTRACT FROM AUTHOR]

Hydrothermally reaction of Cd(NO3)2·4H2O, pimelic acid (H2Pim) mixed with two N-containing ligands of 1,2-bis(2-methyl-imidazol-1-ylmethyl)benzene (1,2-mbix) or 1,3-bis(2-methyl-imidazol-1-ylmethyl)benzene (1,3-mbix) gave rise to two new Cd(II) MOFs, [Cd(Pim)(1,2-mbix)] (1) and [Cd(Pim)(1,3-mbix)]·H2O (2). Both MOFs were structurally characterized by IR and UV–Vis spectra, single-crystal and powder X-ray diffraction, thermogravimetric analyses. MOF 1 shows a fourfold interpenetrating dia network. Differently, MOF 2 shows a 2D → 3D interdigitated architecture base on the 63hcb layer when 1,2-mbix was replaced by 1,3-mbix. The luminescent properties of 1 and 2 have been investigated. Furthermore, the luminescent quenching experiments suggest both MOFs exhibit good selectivity and sensitivity to detect Fe3+ and Cr2O72− in water. [ABSTRACT FROM AUTHOR]

Two new heterometallic CuEr cluster complexes based on 3,5-dichlorobenzoic acid (HL) and 2,2′:6′,2″-terpyridine (TPY), [Cu(L)(TPY)][Er(L)4]·H2O (1) and [Cu(L)(TPY)][Er2(L)7] (2), have been hydrothermally prepared by controlling the metal–ligand ratios. Comparative study revealed that metal–ligand ratios affected the coordination modes of L− and thus generate two distinct structures. Both complexes display as ion-pair bicomponent structures. The cationic [Cu(L)(TPY)]+ components show the similar binuclear cluster structure in two complexes, while the two anionic parts are very different. In 1, two Er(III) centers are coordinated by four bridging and four chelating L− ligands to form the binuclear anionic [Er2(L)8]2− cluster. While in 2, all L− ligands show the bridging modes and connect the Er(III) centers into an extended one-dimensional (1D) chain. So the overall structures of 1 and 2 are bicomponent 0D + 0D and 0D + 1D structures, respectively. Direct current magnetic susceptibility measurements were performed for two complexes and they both showed antiferromagnetic behavior. [ABSTRACT FROM AUTHOR]

Two new CdII MOFs, namely, two‐dimensional (2D) poly[[[μ2‐1,4‐bis(1H‐benzimidazol‐1‐yl)butane](μ2‐heptanedioato)cadmium(II)] tetrahydrate], {[Cd(C7H10O4)(C18H18N4)]·4H2O}n or {[Cd(Pim)(bbimb)]·4H2O}n (1), and 2D poly[diaqua[μ2‐1,4‐bis(1H‐benzimidazol‐1‐yl)butane](μ4‐decanedioato)(μ2‐decanedioato)dicadmium(II)], [Cd2(C10H16O4)2(C18H18N4)(H2O)2]n or [Cd(Seb)(bbimb)0.5(H2O)]n (2), have been synthesized hydrothermally based on the 1,4‐bis(1H‐benzimidazol‐1‐yl)butane (bbimb) and pimelate (Pim2−, heptanedioate) or sebacate (Seb2−, decanedioate) ligands. Both MOFs were structurally characterized by single‐crystal X‐ray diffraction. In 1, the CdII centres are connected by bbimb and Pim2− ligands to generate a 2D sql layer structure with an octameric (H2O)8 water cluster. The 2D layers are further connected by O—H...O hydrogen bonds, resulting in a three‐dimensional (3D) supramolecular structure. In 2, the CdII centres are coordinated by Seb2− ligands to form binuclear Cd2 units which are linked by bbimb and Seb2− ligands into a 2D hxl layer. The 2D layers are further connected by O—H...O hydrogen bonds, leading to an 8‐connected 3D hex supramolecular network. IR and UV–Vis spectroscopy, thermogravimetric analysis and solid‐state photoluminescence analysis were carried out on both MOFs. Luminescence sensing experiments reveal that both MOFs have good selective sensing towards Fe3+ in aqueous solution. [ABSTRACT FROM AUTHOR]

Two new metal–organic frameworks (MOFs), namely, three‐dimensional poly[diaquabis{μ2‐1,4‐bis[(2‐methyl‐1H‐imidazol‐1‐yl)methyl]benzene}bis(μ2‐glutarato)dinickel(II)] monohydrate], {[Ni2(C5H6O4)2(C16H18N4)2(H2O)2]·H2O}n or {[Ni2(Glu)2(1,4‐mbix)2(H2O)2]·H2O}n, (I), and two‐dimensional poly[[{μ2‐1,4‐bis[(2‐methyl‐1H‐imidazol‐1‐yl)methyl]benzene}(μ2‐glutarato)zinc(II)] tetrahydrate], {[Zn(C5H6O4)(C16H18N4)]·4H2O}n or {[Zn(Glu)(1,4‐mbix)]·4H2O}n (II), have been synthesized hydrothermally using glutarate (Glu2−) mixed with 1,4‐bis[(2‐methyl‐1H‐imidazol‐1‐yl)methyl]benzene (1,4‐mbix), and characterized by single‐crystal X‐ray diffraction, IR and UV–Vis spectroscopy, powder X‐ray diffraction, and thermogravimetric and photoluminescence analyses. NiII MOF (I) shows a 4‐connected 3D framework with point symbol 66, but is not a typical dia network. ZnII MOF (II) displays a two‐dimensional 44‐sql network with one‐dimensional water chains penetrating the grids along the c direction. The solid‐state photoluminescence analysis of (II) was performed at room temperature and the MOF exhibits highly selective sensing toward Fe3+ and Cr2O72− ions in aqueous solution. [ABSTRACT FROM AUTHOR]

Syntheses and characterizations of two new Cd(II) coordination polymers based on a novel tetra-imidazole ligand are described. 1 and 2 display a 3D supramolecular structure and an unprecedented (3,4,6)-connected trilayer structure, respectively. The photoluminescent and thermal properties of both polymers have been investigated. • Two Cd(II) coordination polymers of a tetra-imidazole ligand have been reported. • 1 displays a 1D chain with the luminescent emission at 462 nm. • 2 shows (3,4,6)-connected trilayer structure with the luminescent emission at 490 nm. Two Cd(II) coordination polymers, [Cd(L)(NO 3) 2 ] (1) and [Cd 2.5 (L)(BDC) 1.5 Cl 2 ] 2 ·3H 2 O (2) have been synthesized based on a novel tetra-imidazole ligand under hydrothermal conditions. (L = bis(3,5-bis((1 H -imidazol-1-yl)methyl)-2,4,6-trimethylphenyl)methane, H 2 BDC = 1,4-benzenedicarboxylate acid). Polymer 1 displays a 1D chain connected by the L ligand, and extends to a 3D supramolecular structure via C H⋯O hydrogen bonds. When added the auxiliary H 2 BDC ligand, a 2D trilayer structure for 2 was constructed, which shows a trinodal (3,4,6)-connected net with unprecedented symbol of (3·4·5) 2 (32·42·52)(3·44·5·68·7) 2. 1 and 2 display photoluminescence at 462 nm and 490 nm, respectively. Thermogravimetric properties of both coordination polymers have also been investigated. [ABSTRACT FROM AUTHOR]

Abstract The hydrothermal reaction of NiSO 4 ·6H 2 O and 4,4′-bis(1-imidazolyl)bipheny (bibp) has afforded a new nickel complex, {[Ni 4 (µ 3 -OH) 4 (µ 4 -SO 4)(bibp) 4 ](OH) 2 ·12H 2 O} n (1). The Ni(II) centers are bridged by µ 3 -OH- anions into cubic [Ni 4 (µ 3 -OH) 4 ] units, which are connected by bibp ligands and µ 4 -SO 4 2- anions into a double-walled 3D framework with channels along c direction. Unusual 1D water cages with a repeat of vase-like water cluster are trapped in the channels. Magnetic studies reveal ferromagnetic behavior for complex 1 , and the thermal property of 1 was also studied. Graphical abstract This contribution describes one unique 3D double-walled framework based on cubic [Ni 4 (µ 3 -OH) 4 ] units, which contains 1D channels occupied by 1D water cages with a repeat of vase-like water cluster and display ferromagnetic behavior. fx1 Highlights • One novel double-walled 3D framework based on cubic [Ni 4 (µ 3 -OH) 4 ] units has been synthesized and structurally characterized. • Complex 1 contains 1D channels occupied by 1D water cages with a repeat of vase-like water cluster. • Magnetic studies reveal ferromagnetic behavior for complex 1. [ABSTRACT FROM AUTHOR]

Under hydrothermal conditions, a new polynuclear Cu(II) complex, [Cu 2 (nip)(ina)( μ 3 -OH)] 2 ·H 2 O ( 1 ) (H 2 nip = 5-nitroisophthalic acid, Hina = isonicotinic acid) has been synthesized with mixed organic ligands. Single crystal X-ray analysis reveals that complex 1 displays a three-dimensional (3D) structure based on the tetranuclear Cu 4 units. In the structure of 1 , two pairs of symmetry-related Cu(II) ions are connected by six carboxyl and two μ 3 -OH groups to generate the tetranuclear Cu 4 units, which are connected by the mixed ligands into a 3D framework. Topology analysis reveals a (3,8)-connected tfz-d net for 1 . Magnetic studies display antiferromagnetic behavior for 1 . And thermogravimetric analysis of 1 has also been investigated. [ABSTRACT FROM AUTHOR]

Abstract: Three new 3D transition metal coordination complexes, namely, [Co(Aze)(L)] (1), [Cu(Aze)(L)]2 (2) and [Cd(Aze)(L)]·3H2O (3) (Aze = azelaic acid, L = 1,4-bis (1-imidazolyl)-benzene) have been synthesized hydrothermally from the self-assembly of the transition metal ions (M2+) with flexible aliphatic dicarboxylate ligand (Aze) and the rigid bis(imidazole) ligand (L). All complexes display three-dimensional (3D) structures. Complex 1 shows a three-fold interpenetrating 4-connected dmp net. Complex 2 shows a noninterpenetrating 4-connected cds net. Complex 3 shows the pcu net built on 6-connected Cd2 units and particularly there exists weave-like water chains penetrating the channels of the pcu net along b direction. Furthermore, thermogravimetric studies of 1, 2 and 3, and photoluminescent property of 3 have also been investigated. [Copyright &y& Elsevier]

Abstract: A novel chiral cyanide-bridged Pr(III)-Cr(III) bimetallic complex, [Pr(DMSO)4(H2O)3Cr(CN)6] (1) (DMSO=dimethylsulfoxide) has been prepared and characterized by single-crystal X-ray diffraction, IR, elemental analysis and solid-state CD spectra. Complex 1 crystallizes in the monoclinic with chiral space group P21 and displays as a dinuclear molecule. The solid-state CD spectra confirm the chiral nature of complex 1. Magnetic studies indicate ferromagnetic interactions between Pr(III) and Cr(III) ions. Ferroelectric measurements reveal that complex 1 exhibits ferroelectric features representing electric hysteresis loops at room temperature with remanent polarizations of 0.111 μC/cm2 and coercive electric fields of 4.13kV/cm. [Copyright &y& Elsevier]

Abstract: Two Co(II) complexes, [Co(bimb)(L1)2] (1) and [Co(bix)(L2)] (2) (bimb=1,4-bis(imidazol-1–yl)-butane, bix=1,4-bis(imidazol-1-yl-methylene)-benzene, HL1 =3,5-dinitro-benzoic acid, H2L2 = o-phthalic acid), have been successfully prepared based on achiral flexible bis(imidazole) ligands via spontaneous resolution. Complexes 1 and 2 crystallize in the asymmetrical monoclinic with P21 and Cc space groups, respectively. Interestingly, magnetic studies reveal that complex 1 demonstrates dominant ferromagnetic behavior and complex 2 displays spin-canting behavior. More interestingly, both complexes 1 and 2 exhibit ferroelectric features representing electric hysteresis loops with the saturation polarization (P s) of ca. 0.085μCcm−2 and 0.141μCcm−2. [Copyright &y& Elsevier]

Two acentric, i.e., noncentrosymmetric, mononuclear complexes, Co(5-ATZ)4Cl2, 1, and Cu(5-ATZ)4Cl2, 2, where 5-ATZ is the monodentate 5-amino-1-H-tetrazole ligand, have been prepared and characterized. Both complexes crystallize in the tetragonal system with the P4nc space group, a member of the polar noncentrosymmetric 4mm class, and thus both 1 and 2 can exhibit ferroelectric and nonlinear optical properties. Magnetic studies indicate that 1 is a paramagnetic high-spin cobalt(II) complex with a rather extensive spin-orbit coupling, modeled as a zero-field splitting parameter, D, of ±91(3) cm-1 and with very weak long-range antiferromagnetic exchange interactions. Direct current (dc) and ac magnetic studies indicate that 2 is a paramagnetic copper(II) complex that exhibits weak ferromagnetic exchange interactions below 15 K. Both 1 and 2 exhibit ferroelectric hysteresis loops at room temperature with remanent polarizations of 0.015 μC/cm2 and coercive electric fields of 5.5 and 5.7 kV/cm, respectively. [ABSTRACT FROM AUTHOR]

Abstract: Two new MOFs, [Mn(HBTC)(2-PyBim)(H2O)] (1) and [Zn2(BTC)(OH)(2-PyBim)] (2) (H3BTC=1,3,5-benzenetricarboxylic acid, 2-PyBim=2-(2-pyridyl)benzimidazole), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction (XRD), infrared spectroscopy (IR), elemental analysis (EA). In 1, adjacent two Mn(II) ions are connected into binuclear Mn2 units which are bridged by HBTC2− anions to generate a two-dimensional (2D) (4,4) network. In 2, the Zn(II) ions are connected into tetranuclear Zn4 units which are bridged by the BTC3− anions to generate a 2D (3,6)-connected non-interpenetrating CdI2-type network with (43)2(46 ·66 ·83) topology symbol. Both 1 and 2 are extended into 3D supramolecular structure by hydrogen bonds and π⋯π interactions. Magnetic studies of 1 indicate that it exhibits ferromagnetic coupling between the binuclear Mn(II) ions, polymer 2 was found to exhibit photoluminescence at about 437nm (λ ex =365nm). [Copyright &y& Elsevier]

Abstract: The hydrothermal reaction of CdCl2·2.5H2O with 3,5-bis-oxyacetate-benzoic acid (H3BOABA) and 4,4′-bis(1-imidazolyl)biphenyl (L) generates a new three-dimensional (3D) coordination polymer, {[Cd2(BOABA)(L)(μ 3-OH)]2·3H2O}n (1). In 1, the Cd(II) centers are connected by carboxylate and μ 3-OH bridges into Cd-O-C rod-like secondary building units (SBUs) which are further linked by BOABA3− and L ligands into the 3D framework. Two types of irregular rhombic channels occupied by free water molecules were observed in the framework. And the topology analysis suggests an unusual (4,8)-connected net for 1. Furthermore, the thermal and photoluminescent properties of 1 have also been studied. [Copyright &y& Elsevier]

Abstract: Three new complexes, namely, [M(Pim)(L)] (M=Co (1), Cd (2), Pim=Pimelic acid, L=1,4-bis(1-imidazolyl)-benzene), [Zn(Pim)(L)]·H2O (3), have been synthesized hydrothermally from the self-assembly of the transtion metal ions (M2+) with flexible aliphatic dicarboxylate ligand (Pim) and the rigid bis(imidazole) ligand(L). Both complexes 1 and 2 consist of left- and right-handed single-helical chains and present a two-dimensional (2D) layer with 36-hxl topology. Complex 3 displays a 2D structure constructed by right-handed single-helical chains and left-handed double-helical chains with intercrossed arrangement. Furthermore, thermogravimetric analyses for 1–3 and the photoluminescent properties of 2 and 3 have also been studied. [Copyright &y& Elsevier]

Abstract: Two new coordination complexes, {[Co3(nip)2(ina)2(H2O)2]·4H2O}n (1) and {[Mn3(nip)2(ina)2]}n (2) (nip=5-nitroisophthalic acid, ina=isonicotinic acid), have been hydrothermally synthesized from mixed rigid ligands. Complex 1 consists of linear trimeric Co3 units which are connected through double bridges into a two-dimensional (2D) (4,4) sql net. While for complex 2, the metal Mn centers are connected into infinite {⋯Mn2⋯Mn2⋯Mn1⋯}n chains which are bridged by nip and ina ligands into a 3D structure with pcu topology. Magnetic properties of the two complexes have also been studied, complex 1 displays ferromagnetic interaction between intracluster Co(II) ions, and complex 2 shows antiferromagnetic behavior. [Copyright &y& Elsevier]

Abstract: Two novel metal–organic frameworks of [M3(ptz)2(N3)4(H2O)2] (M=Zn(1), Cd(2)) (ptz=5-(4-pyridyl)tetrazolate) have been prepared hydro(solvo)thermally by reactions of 4-cyanopyridine and excess NaN3 in the presence of zinc and cadmium chloride, respectively. The overall structure motif of complexes 1 and 2 show pillared layered frameworks and feature an unprecedented 3-nodal network with (3,5,6)-connectivity. The layer is of particular interest as it is constructed by μ1,1–N3 − and μ1,1,3–N3 − bridging modes, simultaneously. Furthermore, the solid fluorescent properties and TGA were studied. [Copyright &y& Elsevier]

Abstract: Two novel complexes, [Co3(N3)2(bca)4(phen)2] (1, bca = benzenecarboxylic acid, phen = 1,10-Phenanthroline) and [Co3(N3)2(bdc)2(phen)2]n (2, bdc = terephthalic acid), have been synthesized hydrothermally and characterized by single crystal X-ray diffraction (XRD), infrared spectra (IR) and element analysis (EA). Complex 1 features unprecedented discrete linear Co3 clusters that formed by mixed (μ-EO-N3)(μ-COO)2 (EO = end-on) triple bridges whereas 2 presents an extended (2D) network based on the similar trinuclear units as 1. Magnetic studies of 1 and 2 reveal that the mixed (μ-EO-N3)(μ-COO)2 triple bridges transmit ferromagnetic behavior. [Copyright &y& Elsevier]

Two Cu(II) coordination polymers of d -camphoric acid and bis-imidazole ligands controlled by metal-ligand ratios are described. 1 shows a 1D chain with (H 2 O) 4 water cluster. 2 displays a 3D pcu network based on paddle-wheel Cu 2 units. Magnetic studies show ferromagnetic interaction in 1 and antiferromagnetic interaction in 2. • Two Cu(II) compounds controlled by metal-ligand ratios are described. • 1 shows a 1D chain with (H 2 O) 4 water cluster. • 2 displays a 3D pcu network based on paddle-wheel Cu 2 units. • Magnetic studies show ferromagnetic interaction in 1 and antiferromagnetic interaction in 2. By controlling the metal-ligand ratios, two new Cu(II) coordination polymers based on d -camphoric acid (H 2 DCA) and 1,4-bis(imidazol-1-yl)-butane (bimb), {[Cu 2 (DCA) 2 (bimb) 2 (H 2 O)] 2 ·7H 2 O} n (1), and {[Cu 2 (DCA) 2 (bimb)]} n (2), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction, IR and UV–Vis spectra, powder X-ray diffraction. Comparative investigation showed that the different metal-ligand ratios affected the coordination modes of ligand and thus resulted in two distinct structures from 1D chain to 3D network. In 1 , the Cu(II) centers are connected by DCA2− and bimb into 1D chains, and (H 2 O) 4 water clusters connect the 1D chains into a 3D supramolecular structure via O H⋯O hydrogen bonds. Differently, the Cu(II) centers in 2 are bridged by four carboxyl of DCA2− to form the binuclear paddle-wheel [Cu 2 (O 2 CR) 4 ] units, which are pillared by bimb ligands into a 3D framework showing 6-connected pcu topology. Moreover, thermogravimetric and magnetic properties of the two CPs have also been investigated. [ABSTRACT FROM AUTHOR]

Two Cd(II) MOFs of sebacic acid and isomeric bis(2-methyl-imidazole) ligands are described. MOF 1 shows a 4-fold interpenetrating dia network. MOF 2 displays a 2D 2-fold interpenetrating network containing both polyrotaxane and polycatenane. Both MOFs exhibit selective sensing toward Fe3+. • Two Cd(II) MOFs of sebacic acid and bis(2-methyl-imidazole) ligands are described. • 1 shows a 4-fold interpenetrating dia network. • 2 displays a 2D 2-fold interpenetrating network containing both polyrotaxane and polycatenane. • Both MOFs exhibit selective sensing toward Fe3+. Two new entangled Cd(II) MOFs, [Cd(Seb)(1,2-mbix)]·H 2 O (1) and [Cd(Seb)(1,4-mbix)] (2), based on sebacic acid (Seb) mixed with 1,2-bis(2-methyl-imidazol-1-ylmethyl)benzene (1,2-mbix) and 1,4-bis(2-methyl-imidazol-1-ylmethyl)benzene (1,4-mbix) ligands, have been hydrothermally prepared and characterized by single-crystal X-ray diffraction, IR and UV–Vis spectra, thermogravimetric and photoluminescent analyses. In 1 , the Cd(II) centers are connected by Seb2− and 1,2-mbix into a 3D framework with a 4-fold interpenetrating dia topology. When 1,2-mbix was replaced by 1,4-mbix, a distinct structure for 2 was constructed, which is a 2D interpenetrating network containing both polyrotaxane and polycatenane features. This result demonstrates the important role of the two position isomeric bis(2-methyl-imidazole) ligands to their structural diversity. 1 and 2 dispay photoluminescence at 368 nm (λ ex = 247 nm) and 401 nm (λ ex = 306 nm), respectively. And both MOFs exhibit selective sensing toward Fe3+ through the luminescent quenching experiments. [ABSTRACT FROM AUTHOR]

Syntheses and magnetic properties of three transition metal complexes based on 4′-p-tolyl-2,2′:6′,2″-terpyridine (ttpy) and SCN− are described. The three complexes shows three distinct structures for the versatile coordination fashions of the metal centers and SCN−, and all shows the supramolecular structures connected by C H⋯S hydrogen bonds and π⋯π interactions. Three transition metal complexes based on 4′-p-tolyl-2,2′:6′,2″-terpyridine (ttpy) and SCN−, [Mn 2 (ttpy) 2 (SCN) 3 Cl] (1), [Co 2 (ttpy) 2 (SCN) 4 ]·H 2 O (2) and [Ni(ttpy)(SCN) 2 ] 2 (3), have been hydrothermally synthesized. The single-crystal X-ray diffraction analyses reveal that the three complexes display discrete molecules with three distinct structures caused by the different coordination geometry of the transition metal centers. Complex 1 contains two neutral independent components of mononuclear [Mn(ttpy)(SCN) 2 ] and binuclear [Mn(ttpy)(SCN)Cl] 2. Complex 2 shows an ion-pair bicomponent structure of [Co(ttpy) 2 ]2+ and [Co(SCN) 4 ]2−. Complex 3 shows a binuclear structure bridged by two end-to-end bridging SCN− anions. Magnetic properties of the three complexes have been investigated. [ABSTRACT FROM AUTHOR]

Two entangled MOFs based on rigid 1,6-naphthalenedisulfonate (1,6-NDS) mixed with flexible 1,4-bis(benzoimidazol-1-yl)butane (bbimb) ligands, [Zn(1,6-NDS)(bbimb) 1.5 ]·2H 2 O (1) and [Cd 2 (1,6-NDS) 2 (bbimb) 3 (H 2 O) 4 ]·2H 2 O (2), have been hydrothermally synthesized and characterized by single-crystal X-ray diffraction, powder X-ray diffraction, thermogravimetric and photoluminescent analyses. In 1 , the Zn(II) ions are connected by bbimb ligands into a 2D (6,3) brick wall structure with the 1,6-NDS2- as dangling arms threaded into the voids of two adjacent layers up and down, and finally generates a 2D→3D polythreading framework. While the Cd(II) centers in 2 are connected by bbimb ligands into a 3D (10,3)-b network, and four (10,3)-b networks interweave to generate a 4-fold interpenetrating structure. 1 and 2 dispay similar photoluminescence at 343 nm (λ ex = 302 nm) and 342 nm (λ ex = 293 nm), respectively. And both MOFs display selective sensing of Fe3+ through the luminescent quenching experiments. Two new MOFs of 1,6-naphthalenedisulfonate and bis-benzimidazole ligands are discribed. Zn MOF 1 shows a 2D → 3D polythreading framework based on 2D (6,3) brick wall. Cd MOF 2 displays a 4-fold interpenetrating network based on 3D (10,3)-b net. Both MOFs have the ability of efficient detection of Fe3+. Image 1 • Two Zn(II)/Cd(II) MOFs of 1,6-naphthalenedisulfonate and 1,4-bis(benzoimidazol-1-yl)butane are described. • 1 shows a 2D.→3D polythreading framework based on 2D (6,3) brick wall. • 2 shows a 4-fold interpenetrating (10,3)-b network. • Both MOFs have the ability of efficient detection of Fe3+. [ABSTRACT FROM AUTHOR]

At present metal–organic frameworks (MOFs) provide an ideal platform for the preparation of various materials. In this work, a new efficient fluorescent sensor [Zn3(L)(HL)(OH)(H2O)3]·H2O (1) for detecting Cr2O72− anions has been synthesized. The luminescence intensities of compound 1 with various types of anions (I−, PO43−, SO42−, NO3−, CO32−, Br−, Cr2O72−) are investigated. The results demonstrate that compound 1 could be a potential candidate for detecting Cr2O72− anions with high selectivity and sensitivity. Additionally, electrocatalytic water-splitting is one of the most efficient ways to produce clean energy hydrogen, but commercially available catalysts are expensive. Hence a new material (R-C@800) has been prepared after the calcination treatment of compound 1, and it is employed as a catalyst material for the hydrogen evolution reaction (HER) in KOH media. The overpotential of R-C@800 at the current density of 10 mA cm−2 is 395 mV. Moreover, the Tafel slope is estimated to be 191 mV dec−1 by fitting the corresponding Tafel plots extracted from the polarization curves. The results show that R-C@800 is a potential HER material. [ABSTRACT FROM AUTHOR]

A new polyiodide compound [Ni(bpy) 3 (H 2 O) 2 ]·bpy·2H 2 O·2I 3 − with the rare 1D → 3D interdigitated architecture has been synthesized by hydrothermal method. A new polyiodide compound [Ni(bpy) 3 (H 2 O) 2 ]·bpy·2H 2 O·2I 3 − (1), where bpy is 4,4′-bipyridine, has been synthesized by hydrothermal method. In 1 , the adjacent Ni(II) ions are bridged with the bpy ligand to form a 1D chain, which is further extended to be a 3D supramolecular framework by π – π interactions. This 3D supramolecular framework is a rare 1D → 3D interdigitated architecture. Compound 1 has been characterized by X-ray crystallography, elemental analysis, IR, PXRD and TG. The variable-temperature magnetic studies indicate very weak antiferromagnetic interactions in 1. [ABSTRACT FROM AUTHOR]

Two new Co(II)-based coordination polymers, [Co(HL)(H 2 O) 2 ] ( 1 ) and [Co(HL)(bpy)]·H 2 O ( 2 ) (H 3 L = 5-((4-carboxyphenoxy)methyl)benzene-1,3-dioic acid, bpy = 4,4′-bipyridine), have been synthesized under hydrothermal conditions. The two compounds have been characterized by single crystal and powder X-ray diffraction analyses, infrared analyses, elemental analyses and thermogravimetric analyses. Compound 1 shows a 3D 2-fold interpenetrating hms framework, whereas compound 2 reveals a typical 3D pcu net. The UV–vis diffuse reflectance spectra of compounds 1 and 2 have been investigated. Moreover, the magnetic susceptibilities of compounds 1 and 2 have been studied. [ABSTRACT FROM AUTHOR]

A novel coordination polymer [Zn(HL)(bpy)(H 2 O)] ( 1 ) has been prepared by utilizing π-conjugated aromatic ligand 5-((4-carboxyphenoxy)methyl)benzene-1,3-dioic acid (H 3 L) and rigid ligand 4,4′-bipyridine (bpy) under the hydrothermal condition. Compound 1 has been characterized by single crystal X-ray diffraction, power X-ray diffraction, elemental analysis, and thermogravimetric analysis. The structure of 1 exhibits 3D supermolecular structure with π–π interactions and hydrogen-bonding interactions . The solid state luminescent emission intensity of compound 1 is strong at room temperature. The rapid and efficient response of 1 to Fe 3+ ion suggests that this material could be used as a luminescent sensor for Fe 3+ ion. [ABSTRACT FROM AUTHOR]

A series of coordination polymers, namely [Zn(μ3-L)(H2O)2] (1), [Zn(μ2-L)(2,2′-bpy)(H2O)] (2), [Zn(μ3-L)(μ2-4,4′-bpy)0.5] (3), [Cd(μ3-L)(2,2′-bpy)] (4), and [Cd(μ2-L)(phen)(H2O)] (5) (H2L = 3-carboxy-1-(3′-carboxybenzyl)-2-oxidopyridinium, 2,2′-bpy = 2,2′-bipyridine, 4,4′-bpy = 4,4′-bipyridine, phen = 1,10-phenanthroline), have been synthesized under hydrothermal conditions. These coordination polymers have been characterized by single-crystal X-ray diffraction, elemental analyses, infrared spectroscopy, thermogravimetric analyses and powder X-ray diffraction. The structure analysis by single crystal X-ray diffraction reveals that compound 1 shows a 1D double chain which can be expanded to a 2D supramolecular architecture through intermolecular π–π stacking interactions. In compound 2, the 1D wave-like chains are extended to a 3D supramolecular framework by intermolecular hydrogen bonds and π–π stacking interactions. In compound 3, the infinite rod-like metal ion chains are linked with L2− anions and 4,4′-bpy to form a 3D framework. In compound 4, the adjacent 1D loop-like chains are interconnected to a 3D supramolecular framework by intermolecular hydrogen bonds and π–π stacking interactions. Compound 5 displays a 3D supramolecular architecture extended from the 1D zigzag chains by intermolecular hydrogen bonds and π–π stacking interactions. The result reveals that the organic ligand plays a key role in the self-assembly of coordination polymers. The luminescence sensing experiments reveal that compounds 1–5 can effectively detect Fe3+, Cr2O72−, and NB. In particular, compound 1 shows a high quenching constant and a low limit of detection for Fe3+. [ABSTRACT FROM AUTHOR]

It is well known that organic inorganic hybrid metal halides have been excellent materials in the field of luminescence. So far, organic-inorganic Pb(Ⅱ) halide hybrids materials have been extensively studied for their excellent optical properties. However, the toxicity of lead may generate additional pollution. It is important to develop new lead-free halide hybrids. In this work, three new organic inorganic hybrid metal halides, namely [(C 4 H 10 NO)Ag 2 I 3 ] (1), [(C 4 H 10 NO) 2 CuI 2.5 ]·0.5I·0.5H 2 O (2) and [(C 4 H 9 NO) 2 CdI 2 ] (3) were synthesized under mild conditions. Compounds 1 and 2 display different one dimensional inorganic chains surrounded by organic amine cations, while compound 3 shows a zero dimensional structure. Their luminescent and optical properties were investigated in detail. The result suggests that these three compounds are potential optical materials. [Display omitted] • Three new organic inorganic hybrid metal halides were synthesized under mild conditions. • Three new compounds show various structures. • The results suggest that these three compounds are potential optical materials. [ABSTRACT FROM AUTHOR]

• Three alkaline earth-based MOFs were synthesized under hydrothermal conditions. • Compounds 1-3 reveal structural diversity owing to different metal ions and organic ligands. • The luminescent properties of compounds 1 - 3 were studied in detail. The alkaline earth-based metal-organic frameworks (MOFs) have attracted more and more attention for their beautiful structure and environmental friendliness. In this work, three alkaline earth-based MOFs, namely [Ba(HL 1)] n (1), [Ca(HL 1)(H 2 O) 2 ] n (2), and [Ba(HL 2)] n (3) (H 3 L 1 = 1-(3-carboxyphenylmethyl)-1H-pyrazol-3,5-dicarboxylic acid and H 3 L 2 = 1-(4-carboxyphenylmethyl)-1H-pyrazol-3,5-dicarboxylic acid), were synthesized under hydrothermal conditions. Compounds 1-3 reveal structural diversity owing to different metal ions and organic ligands. Thermal and solvent stability were characterized by thermogravimetric analyses (TG) and powder X-ray diffraction (PXRD), respectively. The solid-state luminescent properties were also investigated. The result shows a clear correlation between emission bands and excitation wavelengths of compounds 1-3. Three new alkaline earth-based metal-organic frameworks with luminescent properties were synthesized and characterized. [Display omitted] [ABSTRACT FROM AUTHOR]

Two new coordination polymers (CPs), namely, {[Zn(tib)(SO4)]·2H2O}n (1) and {[Cd(tib)(2,6-pydc)(H2O)]·H2O}n (2), have been hydrothermally synthesized based on the rigid 1,3,5-tris(imidazol-1-yl)benzene (tib) and 2,6-pyridinedicarboxylate (2,6-pydc2−) ligands. Both CPs were structurally characterized by single-crystal X-ray diffraction. In 1, the Zn(II) centers are connected by tib to generate a 2D → 2D polythreading honeycomb 63 bilayer structure with the SO42− as rods. The bilayers are further connected by O–H···O hydrogen bonds to result in a 3D supramolecular structure. In 2, the Cd(II) centers are coordinated by 2,6-pydc2− to form binuclear Cd2 units which are linked by µ2-tib into 1D chain. The 1D chains are further connected by O–H···O hydrogen bonds, leading to the 2D hydrogen bonded network. Finally, it shows a 2D → 3D interdigitated architecture based on the 2D hydrogen bonded layers through the uncoordinated imidazole rings of tib ligands. The thermogravimetric properties and solid-state photoluminescence of 1 and 2 were investigated. Two new photoluminescent Zn(II) and Cd(II) coordination polymers of 1,3,5-tris(1-imidazolyl)benzene were investigated in this work. [ABSTRACT FROM AUTHOR]

• Five new coordination polymers (CPs) have been constructed by using 1-(4-carboxybenzyl)−1H-pyrazole-3,5-dicarboxylic acid (H 3 L) as an organic ligand. • Five compounds show various structures because of different metal ions, various coordination modes of H 3 L and the addition of the neutral ligand. • The luminescent properties of compounds 1 – 5 have been studied in detail. Five new coordination polymers (CPs), namely {Pb 1.5 (L)} (1), {Pb 3 (L) 2 (2,2′-bpy) · 2·5H 2 O} (2), {[P b (HL)(phen)] · H 2 O} (3), {Ag 2 (HL)} (4) and {Ag(H 2 L)(phen)} (5), have been constructed by using 1-(4-carboxybenzyl)-1H-pyrazole-3,5-dicarboxylic acid (H 3 L) as an organic ligand. Compound 1 reveals a three-dimensional (3D) (4,6,7)-connected framework with the point symbol of {410·65}{46} 2 {48·613} 2. Compound 2 exhibits a novel (3,6)-connected 3D framework based on a trinuclear Pb(II) cluster with point symbol {42.6} 2 {44.62.88.10}. Compound 3 is a 1D chain that is further assembled into a 3D supramolecular framework by hydrogen-bonds. Compound 4 shows a (3,6)-connected 3D structure based on a tetranuclear Ag(I) cluster with {4·62} 2 {42·610·83} topology. Compound 5 is a 0D structure, and can be further expanded into a 3D supramolecular network by various weak interactions. The solid-state luminescent spectra have been measured at room temperature. The results show that compounds 1–5 exhibit strong luminescent emission in the visible region, and can be tunable by varying excitation wavelengths. Five new luminescent coordination polymers have been synthesized under solvothermal conditions. [Display omitted] [ABSTRACT FROM AUTHOR]

In this work, five Ag(I)-based CPs with luminescent properties have been synthesized under hydrothermal conditions. [Display omitted] • Five Ag(I)-based coordination polymers (CPs) have been synthesized under hydrothermal conditions. • Organic ligand plays a key role in the formation of the final structures. • The luminescent color of compounds 1 – 5 can be tunable by varying excitation wavelengths. In this work, five Ag(I)-based coordination polymers (CPs), namely, [Ag(HL)(H 2 L)] n (1), [Ag(HL)(2,2′-bpy)(H 2 O) 0.5 ] (2), [Ag(HL)(phen)(H 2 O) 0.5 ] (3), {[Ag 2 (HL) 2 (4,4′-bpy)(H 2 O) 2 ]∙H 2 O} (4) and [Ag(HL)(thpy)] n (5), were synthesized under hydrothermal conditions (H 2 L = 1-(3-carboxybenzyl)-1H-pyrazole-4-carboxylic acid, 2,2′-bpy = 2,2′-bipyridine, phen = 1,10-phenanthroline, 4,4′-bpy = 4,4′-bipyridine and thpy = 2-(2-thienyl)pyridine). These coordination polymers were characterized by single-crystal X-ray diffraction, elemental analyses, infrared spectroscopy, thermogravimetric analyses and powder X-ray diffraction. Compound 1 displays a one-dimensional (1D) chain structure which can be further extended into a three-dimensional (3D) supramolecular structure via intermolecular hydrogen bond. In compounds 2 and 3 , the binuclear zero dimensional (0D) units are extended to 3D supramolecular frameworks by intermolecular hydrogen bond and π–π stacking interaction. In compound 4 , the 0D units constructed by HL− anions, 4,4′-bpy and metal ions are expanded to form a two-dimensional (2D) supramolecular network. Compound 5 shows a different 2D supramolecular structure extended from 1D chain by intermolecular hydrogen bond. The results suggest that organic ligand plays a key role in the formation of the final structures. The solid-state luminescent properties of compounds 1 – 5 were studied in detail. The results show that the luminescent color of compounds 1 – 5 can be tunable by varying excitation wavelengths. [ABSTRACT FROM AUTHOR]

Two new 3D Co(II) MOFs based on 1,5-naphthalenedisulfonate and bis(benzimidazole) ligands are reported. The two MOFs show the dia and pcu nets, respectively, and they both exhibit selective sensing toward Fe3+ and Cr 2 O 7 2− in water. [Display omitted] Two novel three dimensional (3D) Co(II) MOFs, namely, {[Co(bbimb) 2 (H 2 O) 2 ]·(1,5-NDS)} n (1) and [Co(1,2-bbix) 2 (1,5-NDS)] n (2), have been hydrothermally prepared (1,5-NDS = 1,5-naphthalenedisulfonate, bbimb = 1,4-bis(1H-benzimidazol-1-yl)butane, 1,2-bbix = 1,2-bis(benzimidazol-1-yl-methyl)benzene). MOFs 1 and 2 were characterized by single-crystal X-ray diffraction, IR and UV–Vis spectra, powder X-ray diffraction (PXRD), thermogravimetric analyses (TGA). In MOF 1 , the Co(II) centers are linked by bbimb ligands to form a 4-connected dia network with the uncoordinated 1,5-NDS2− as counter ions. In MOF 2, when used 1,2-bbix instead of bbimb, the 1,5-NDS2− coordinate to the Co(II) centers and link the centers with 1,2-bbix ligands into a 6-connected pcu network. MOF 1 and 2 dispay photoluminescence at 425 nm (λ ex = 357 nm) and 418 nm (λ ex = 350 nm), respectively. The luminescence sensing experiments show that two MOFs both have good selective sensing for Fe3+ and Cr 2 O 7 2− in aqueous solution. [ABSTRACT FROM AUTHOR]

Two Ni(II)-based coordination polymers, [Ni 1.5 (L)(dib) 1.5 (H 2 O)]·2H 2 O (1) and [Ni 1.5 (L)(bimb) 1.5 (H 2 O) 2 ·4H 2 O (2), were synthesized by using the same anionic ligand and different neutral ligands under hydrothermal conditions. • Two CPs were synthesized by using an anionic ligand and different neutral ligands. • Compound 1 reveals a 2D net which is extended to be a 3D supramolecular framework with intermolecular π-π interactions. • Compound 2 shows a 2-fold interpenetrating (3,4,4)-connected framework with {63} 2 {62·84}{64·82} 2 topology. Two Ni(II)-based coordination polymers, [Ni 1.5 (L)(dib) 1.5 (H 2 O)]·2H 2 O (1) and [Ni 1.5 (L)(bimb) 1.5 (H 2 O) 2 ·4H 2 O (2), were synthesized by using the same anionic ligand and different neutral ligands under the same hydrothermal conditions. The structures of these two coordination polymers were determined by single-crystal X-ray crystallography. Compound 1 reveals a 2D net which is extended to be a 3D supramolecular framework with intermolecular π-π interactions. Compound 2 shows a 2-fold interpenetrating (3,4,4)-connected framework with {63} 2 {62·84}{64·82} 2 topology. The results confirm that organic ligands play an important role in the assembly of various coordination polymers. Elemental analyses, infrared spectra, powder X-ray diffraction and UV–vis absorption spectra were measured, and magnetic properties were also studied. [ABSTRACT FROM AUTHOR]

Presented here is a three-dimensional structure [Cd 3 (IN) 5 ]·I 3 − ( 1 ) based on isonicotinic acid. Compound 1 has been characterized by single crystal X-ray diffraction, powder crystal X-ray diffraction, infrared spectrum, thermogravimetric analysis, element analysis and scanning electron microscopy. The structure of compound 1 shows a 3D framework constructed by rod-shaped metal chains together with IN anions, while the channels are occupied by triiodide ions. The luminescent properties of 1 have also been investigated. [ABSTRACT FROM AUTHOR]

Four new coordination polymers 1 - 4 have been synthesized by H 2 L and bpy under hydrothermal conditions. [Display omitted] • Four new coordination polymers 1 - 4 have been synthesized by H 2 L and bpy under hydrothermal conditions. • The structures of compounds 1 - 3 are essentially isomorphic and reveal that the 1D chains are extended to the 2D supramolecular layer by intermolecular π-π interactions. • Compound 4 shows a 0D → 1D interdigitated architecture, and the interdigitated supramolecular chains are extended to the 2D structure by intermolecular π-π interactions. Coordination polymers have received considerable attention for their fascinating architectures and potential applications. It is well-known that several factors influence the final structures of desired coordination polymers. In this work, four new coordination polymers [Mn(L)(bpy)]·H 2 O (1), [Co(L)(bpy)]·H 2 O (2), [Cd(L)(bpy)]·H 2 O (3), and [Zn(L)(bpy)]·H 2 O (4) were constructed by (3-carboxyl-phenyl)-(4-(2'-carboxyl-phenyl)-benzyl) ether (H 2 L) and 2,2'-bipyridine (bpy). Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by IR spectra, elemental analyses, and thermogravimetric analyses. The results exhibit that the structures of compounds 1 - 3 are essentially isomorphic and display similar ladder-like double-chain structures. The adjacent chains are extended to the 2D supramolecular layer by intermolecular π-π interactions. Compound 4 shows a 0D metallomacrocyclic structure, which can penetrate adjacent metallomacrocyclic to generate a 0D → 1D interdigitated architecture. Furthermore, the interdigitated supramolecular chains are extended to the 2D supramolecular structure by the intermolecular π-π interactions. The results display the π-π interaction plays an important role in the final structures of coordination polymers. [ABSTRACT FROM AUTHOR]

A new 3D Cd(II) MOF based on tetracarboxylic acid and tris-benzimidazole ligands was reported. The Cd(II) MOF shows a 4-connected mog -net structure and exhibits selective sensing toward Fe3+ and Cr 2 O 7 2− in water. [Display omitted] • A Cd(II) MOF of tetracarboxylic acid and tris-benzimidazole ligands is described. • MOF 1 shows a 3D 4-connected mog -net. • MOF 1 exhibits selective sensing toward Fe3+ and Cr 2 O 7 2−. A tris-benzimidazole ligand, 1,3,5-tris(benzimidazol-1-ylmethyl)-2,4,6-trimethylbenzene (tbimb), and 3,3′,4,4′-biphenyltetracarboxylic acid (H 4 bptc) were selected as organic ligands to construct a new Cd(II) MOF under hydrothermal condition, [Cd(bptc) 0.5 (tbimb)(H 2 O)]·H 2 O (1). In the crystal structure of 1 , the Cd(II) centers were connected by bptc4− and tbimb ligands to generate a 3D framework, which shows a 4-connected mog -net with point symbol of (4·64·8) 2 (42·62·82). UV–Vis spectrum of 1 shows two bands at 236 and 304 nm. Thermogravimetric and powder X-ray diffraction analyses indicate MOF 1 has good stability. The solid state photoluminescence of 1 shows the emission peak at 358 nm when it was excited at 291 nm. Furthermore, the luminescent quenching experiments suggest MOF 1 exhibits good selectivity and sensitivity to detect Fe3+ and Cr 2 O 7 2− in water. [ABSTRACT FROM AUTHOR]