Zinc(II) and manganese(II) coordination polymers constructed by 2-naphthyl imidazole dicarboxylate: syntheses,structures and properties

Three coordination polymers [Zn(μ₃-HNIDC)(CH₃OH)]_n (H₃NIDC = 2-(2-naphthyl)-1H-imidazole-4,5-dicarboxylic acid) (1), [Mn(μ₂-HNIDC)(4,4′-bipy)]_n (4,4′-bipy = 4,4′-bipyridine) (2) and [Mn₂(μ₂-HNIDC)₂(phen)₂]_n (phen = 1,10-phenanthroline) (3) have been solvothermally synthesised and structurally characterised by single-crystal X-ray diffraction, elemental analyses, thermal analyses and IR spectra. Polymer 1 displays a three-dimensional open architecture with one-dimensional (1D) channels. Polymer 2 exhibits a sheet structure containing infinite rectangles. Polymer 3 presents a 1D wave chain structure. The solid-state photoluminescence of 1 has been investigated as well.     

Syntheses,structures and properties of four metal-organic frameworks from chlorophenyl imidazole dicarboxylates

Four metal-organic frameworks, [Sr(o-ClPhHIDC)(H₂O)₂]_n (o-ClPhH₃IDC = 2-(o-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid) (1), [Mg(m-ClPhHIDC)(H₂O)₂]_n (2), [Sr(m-ClPhHIDC)(H₂O)]_n (3) and {[Co₃(m-ClPhIDC)₂(H₂O)₆]·2H₂O}_n (m-ClPhH₃IDC = 2-(m-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid) (4), have been solvothermally synthesized and structurally characterized. Single-crystal X-ray analyses reveal that 1–3 show 2-D architectures and 4 exhibits a 3-D structure. The o-ClPhH₃IDC and m-ClPhH₃IDC ligands in the polymers can be partly deprotonated and coordinate to metal ions by various modes. The metal ions of 1–4 are coordinated only to oxygens. The thermal and luminescence properties of the polymers have also been investigated.     

Three different structural lead(II) polymers constructed from newly designed chlorophenyl-imidazole dicarboxylate ligands

A 1-D coordination polymer, {[Pb(o-ClPhH₂IDC)₂]·H₂O}_n (o-ClPhH₃IDC = 2-(2-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid) (1), a 2-D coordination polymer, [Pb₃(p-ClPhIDC)₂(H₂O)]_n (p-ClPhH₃IDC = 2-(4-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid) (2), and a 3-D polymer, [Pb(p-ClPhH₂IDC)₂]_n (3), have been obtained solvothermally and structurally characterized by elemental analyses, IR, and single-crystal X-ray diffraction. Although they were prepared with similar ligands and Pb²⁺, polymers 1–3 show distinct structures. The X-ray powder diffraction and thermal properties of the polymers have been investigated. The influence of the reaction conditions to the final products and coordination of the organic ligands are discussed.     

Syntheses,structural diversity and properties of three coordination polymers built by chlorophenyl imidazole dicarboxylate

Two 2D coordiantion polymers, [Sr(p-ClPhHIDC)(H₂O)]_n (p-ClPhH₃IDC = 2-(4-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid) (1) and [Cd₃(p-ClPhH₂IDC)₂(p-ClPhHIDC)₂(H₂O)₂]_n (2) and one 3D polymer {[Co₃(p-ClPhHIDC)₃(H₂O)₃]·6H₂O}_n (3) have been prepared successfully under solvothermal conditions and structurally characterised by elemental analyses, IR and XRPD determinations, and have been further analysed by single-crystal X-ray diffraction. Polymer 1 exhibits a graceful 2D grid sheet structure. Polymer 2 can be regarded as a (3,3,4)-coordinated 2D network. Polymer 3 exhibits a 3D motif with 1D open channels and [Co₁₂(p-ClPhHIDC)₉] bihexagonal rings. The coordination features of the newly prepared imidazole dicarboxylate ligand, p-ClPhH₃IDC, have been discussed from both theoretical and experimental aspects. Furthermore, the solid-state photoluminescence and thermal properties of the polymers have also been investigated.     

Pyridine effected tunable luminescence properties of a 1D cadmium(II) polymer with tetranuclear second building units

One novel 1D polymer, [Cd₂(m-BrPhHIDC)₂(4,4′-bipy)(H₂O)₂]_n (1) (m-BrPhH₃IDC = 2-(3-bromophenyl)-1H-imidazole-4,5-dicarboxylic acid; 4,4′-bipy = 4,4′-bipyridine), has been hydrothermally synthesised and characterised by single-crystal X-ray diffraction, elemental analysis, IR, powder X-ray diffraction (PXRD) and thermogravimetric analysis. Polymer 1 composed of tetranuclear square [Cd₂(m-BrPhHIDC)₂] second building units and 4,4′-bipy bridges shows the interesting tunable luminescence properties aroused by pyridine. A luminescence enhance mechanism has been proposed.     

Two 3-D metal-organic frameworks constructed by 2-methyl or 2-ethyl imidazole dicarboxylates

Two polymeric frameworks, [Zn₅(MIDC)₂(HMIDC)₂(phen)₅] _n (1) (H₃MIDC?=?2-methyl-1H-imidazole-4,5-dicarboxylic acid, phen?=?1,10-phenanthroline) and {[Ca₂(HEIDC)₂(H₂O)]?·?H₂O} _n (2) (H₃EIDC?=?2-ethyl-1H-imidazole-4,5-dicarboxylic acid), have been solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction. Compound 1 exhibits a 3-D structure constructed from 2-D layer motifs joined by µ ₂-HMIDC^2? or µ ₃-MIDC^3? ligands. Compound 2 also presents a 3-D framework, generated from 1-D chains linked by HEIDC^2? ligands by two different µ₅-modes. The thermal and solid-state photoluminescence properties of both the complexes have been determined.     

Syntheses,structures, and luminescence of two Zn(II) coordination polymers based on 5-(4-imidazol-1-yl-phenyl)-2H-tetrazole and carboxylates

Reactions of Zn(II) salts, 5-(4-(1H-imidazol-1-yl)phenyl)-1H-tetrazolate (HIPT) and 2-mercaptobenzoic acid or 2-propyl-1H-imidazole-4,5-dicarboxylic acid (H₃PrIDC), result in two mixed-ligand coordination polymers (CPs), [Zn₂(IPT)(DSDB)(OH)]_n (H₂DSDB = 2,2′-disulfanediyldibenzoic acid, 1) and [Zn₂(IPT)(PrIDC)(H₂O)]_n (H₃PrIDC = 2-propyl-1H-imidazole-4,5-dicarboxylic acid, 2). Compound 1 possesses a 2-D structure built by 1-D [Zn(IPT)]_n chains and DSDB^2? connectors, in which the DSDB^2? is generated via in situ reaction from 2-mercaptobenzoic acid. It displays a new intricate 4-nodal {3·4·6·7·8·9}{3·6·7·8·9·10}{3·8·9}{4·6·8} topology. Compound 2 displays a 3-D framework with new 3-connected topology with Schläfli symbol of (4·8·10) (8·12²), in which the 1-D Zn-carboxylate chains were bridged by 3-connected IPT^? ligands. The thermal stabilities and luminescence properties of 1 and 2 have also been studied. The compounds exhibit intense solid-state fluorescent emissions at room temperature.     

Two tetranuclear Ni(II) complexes from substituted imidazole dicarboxylates: syntheses,structures, thermal and magnetic properties

Two tetranuclear nickel(II) complexes, [Ni₄ (p-BrPhHIDC)₄(py)₄(H₂O)₄]·CH₃OH (p-BrPhH₃IDC = 2-(p-bromophenyl)-1H-imidazole-4,5-dicarboxylic acid) (1) and [Ni₄(p-ClPhHIDC)₄ (CH₃CN)₄(H₂O)₄]·4H₂O (p-ClPhH₃IDC = 2-(p-chlorophenyl)-1H-imidazole-4,5-dicarboxylic acid, py = pyridine) (2), have been solvothermally synthesised and structurally characterised. Both compounds consist of similar tetranuclear Ni(II) cores, in which the imidazole dicarboxylate ligands adopt the similar coordination mode. The thermal properties of 1 and 2 have been investigated. Also, it is discovered that there exists antiferromagnetic coupling between the Ni(II) ions in 1 and 2; the best fittings to the experimental magnetic susceptibilities gave J = ? 9.89 cm^? 1 and g = 2.18 for 1, and J = ? 10.54 cm^? 1 and g = 2.14 for 2.     

Three-pillared layer metal–organic frameworks assembled by imidazole-4,5-dicarboxylate and rigid bisimidazole ligands: synthesis,crystal structure,and sensing nitroaromatics

Three-pillared layer metal–organic frameworks based on 1H-imidazole-4,5-dicarboxylate and linear bis(imidazole) ligands generally formulated as {[Co₃(idc)₂(bib)₃]·8H₂O}_n (1), {[Cd(Hidc)(bib)_0.5]}_n (2) and {[Cd(Hidc)(bibp)]}_n (3), where H₃idc = 1H-imidazole-4,5-dicarboxylate, bib = 1,4-bis(1-imidazolyl)benzene and bibp = 4,4′-bis(1-imidazolyl)biphenyl, have been solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction. Compound 1 features a 3-D-pillared layer structure with 1-D channels, generated by honeycomb-like 2-D layer linked by bib ligands. Compound 2 consists of 2-D lumpy layers of [Cd₄(Hidc)₄], which are further connected by bridging ligands of bib to generate a pillared layer 3-D framework with 1-D channels. In 3, the 2-D corrugated honeycomb networks, structurally analogous to CFx, are pillared by bibp ligands to form a 3-D architecture with 1-D channels. Through selecting different metal ions and the length of pillared ligands, the pore sizes are adjusted in the three complexes. The potential of 2 and 3 for nitro explosive sensing is investigated through luminescence quenching experiments, which show that 3 can be applied as a fluorescent sensor for nitro compounds.     

Syntheses,structures, and properties of three MOFs based on tertbutylphenyl imidazole dicarboxylate

By hydrothermal reactions of a newly designed ligand, 2-(p-tert-butylphenyl)-1H-imidazole-4,5-dicarboxylic acid (H₃BuPhIDC) with Cd(II) or Zn(II), three metal-organic frameworks, [Cd(μ₃-HBuPhIDC)(H₂O)]·2H₂O (1), [Cd(μ₃-HBuPhIDC)(4,4′-bipy)_0.5] (4,4′-bipy = 4,4′-bipyridine) (2), and [Zn₂(μ₃-HBuPhIDC)₂(CH₃OH)₂] (3), have been obtained and characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. In 1, small countless diamond grids form a mesh structure and then are bridged through μ₃-HBuPhIDC^2? linkers building a 3-D framework. Compared with 1, 4,4′-bipy participates in the construction of a 3-D structure of 2. Polymer 3 shows an interesting 3-D open architecture, which contains infinite 1-D octagonal channels built by left- and right-handed helical chains. Thermal and solid-state photoluminescence properties of the polymers have been investigated.     

Synthesis,properties, and X-ray crystal structures of two Ag(I) complexes with 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarboxylic acid

Two 1-D and 3-D Ag(I) complexes involving 2-(pyridin-4-yl)-1H-imidazole-4,5-dicarboxylic acid (H₃PIDC) have been characterized by infrared spectrum, elemental analysis, and single-crystal X-ray diffraction. [Ag₂(HPIDC)]_n (1), synthesized under hydrothermal conditions, gave a 3-D framework; [Ag₂(HPIDC)(MBI)]_n (2) (MBI?=?2-methyl-1H-benzo[d]imidazole), with MBI as the second ligand, gave a 1-D zigzag chain and further formed a 3-D supramolecular structure through π···π interactions. The most interesting structural features of these complexes are the presence of C–H···Ag hydrogen bonding interactions and Ag···C weak interactions between the Ag centers and H₃PIDC. Luminescence indicates that 2 has significantly stronger fluorescent emissions than 1 in the solid state at room temperature.     

Syntheses,crystal structures,and fluorescent properties of two Cd(II) complexes based on 2,2′-(ethane-1,2-diyl)bis(1H-imidazole-4,5-dicarboxylic acid)

Two new complexes, [Cd₂(H₄ebidc)₂(CH₃OH)₄]?·?2CH₃OH (1) and {[Cd(Cl)(I)(H₆ebidc)_1/2]?·?1/2bbe?·?H₂O} _n (2) (H₆ebidc?=?2,2′-(ethane-1,2-diyl)bis(1H-imidazole-4,5-dicarboxylic acid), bbe?=?1,2-bis(2-benzimidazolyl)ethane), are obtained through self-assembly of H₆ebidc with Cd(II). Single-crystal X-ray diffraction shows that 1 has a binuclear structure and each tridentate chelating ligand coordinates to two Cd(II) ions with µ₂-O. Complex 2 displays a 1-D chain structure and each tetradentate ligand bridges two Cd(II) ions in chelating fashion. Fluorescent properties have also been determined.     

Synthesis and structures of two cobalt(II) coordination networks formed from aromatic polycarboxylates and 1,4-bis(imidazole-1-ylmethyl)benzene

Two Co(II) coordination polymers, [Co(Hbtc)(bix)] _n , (1) and [Co(1,4-bdc)(bix)H₂O] _n (2) (bix = 1,4-bis(imidazole-1-ylmethyl)benzene; H₃btc = benzene-1,3,5-tricarboxylic acid; 1,4-H₂bdc = benzene-1,4-dicarboxylic acid) have been synthesized under hydrothermal conditions and structurally characterized. X-ray structure analysis reveals that in polymer 1, 2D infinite grid-like frameworks are interconnected by hydrogen-bond interactions to result in a 3D supramolecular architecture, in which the three carboxylate groups of the H₃btc molecule adopt three different coordination modes. In polymer 2, 1,4-bdc ligands with cobalt atoms construct 1D zigzag chains which are bridged by bix ligands to form a 3D framework.     

A phenyl imidazole dicarboxylate-based 3D terbium–organic framework for selective sensing of nitrobenzene

A novel lanthanide(III)–organic framework, {(Tb(μ₃-HPhIDC)(μ₂-C₂O₄)_0.5(H₂O))·2H₂O}_n (1) (H₃PhIDC = 2-phenyl-1H-imidazole-4,5-dicarboxylic acid) has been solvothermally synthesised and structurally characterised, which exhibits selective detection of nitrobenzene via a photoinduced electron transfer quenching mechanism. The high efficiency, stability and recyclability of 1 make it a potential chemosensor for nitrobenzene.     

锌、镉配位聚合物的合成、晶体结构及荧光性质

通过水热法合成了2个金属-有机配位聚合物[Zn（boba）（bix）]_n=（1）和[Cd（L1）（L2）]_2n=·nH₂O（2）（H₂boba=4,4’-（丁烷-1,2-二氧基）-二苯甲酸,bix=1,4-双（咪唑基-1-基）苯,H₂L1=4-（羧基甲氧基）苯甲酸,L2=2-（4-羟基）-1H-咪唑并[4,5-f][1,10]菲咯啉）。并对其进行了元素分析、红外光谱、热重和X-射线单晶衍射测定。配合物1为二维网状结构,配合物2为一维双链结构。此外,还研究了它们的荧光性质。     

Luminescent sensing of Fe3+ and K+ by three novel imidazole dicarboxylate-based MOFs

In this paper, three luminescent metal–organic frameworks, namely: [Zn(p-IPhHIDC)]_n (1), {[Cd(p-IPhIDC)(H₂O)]·CH₃OH}_n (2) and [Zn(p-TIPhHIDC)]_n (3), bearing two novel substituted imidazole dicarboxylate ligands, 2-(p-N-imidazol-1-yl)-phenyl-1H-imidazole-4,5dicarboxylic acid (p-IPhH₃IDC) and 2-p-(1H-1,2,4-triazol-1-yl)-phenyl-1H-imidazole-4,5dicarboxylic acid (p-TIPhH₃IDC), have been prepared and characterised through infrared spectra, X-ray powder diffraction, elemental analyses, thermogravimetric analyses and single-crystal X-ray diffraction. Ignoring the free methanol molecule and coordinated water in 2, 1–3 are similar structures. Moreover, the luminescent properties of the MOFs have been explored. It was found that MOFs 1 and 2 show good luminescent sensing of Fe³⁺ in varying degrees, and 3 of K⁺.     

Cobalt(II)/silver(I) coordination polymers with bis(2-methylbenzimidazole) and polycarboxylate ligands

Three coordination polymers, [Co(L)(tbta)]_n (1), [Ag(L)(H₂O)·(Hhpht)]_n (2) and [Ag₂(L)_1.5(oba)]_n (3) (L = 1,4-bis(2-methylbenzimidazol-1-ylmethyl)benzene, H₂tbta = tetrabromoterephthalic acid, H₂hpht = homophthalic acid, H₂oba = 4,4′-oxybis(benzoic acid)), have been hydrothermally synthesized and structurally characterized. Complex 1 displays a 2-D uninodal 4-connected sql network, 2 and 3 feature chain structures, which further generate 2D supramolecular networks through hydrogen bonding interactions. The thermal and fluorescence properties of 1–3 have been carried out and discussed.     

Assembly of three 3-D MOFs from 2-phenyl-4,5-imidazole dicarboxylate and oxalate

Three lanthanide–organic polymers, {[Ln(μ ₃-HPhIDC)(μ ₂-C₂O₄)_0.5(H₂O)]?·?2H₂O} _n (Ln?=?Nd (1), Sm (2), and Tb (3)), have been isolated from the reaction of 2-phenyl-1H-imidazole-4,5-dicarboxylic acid (H₃PhIDC) with equal amount of Ln(III) salts under solvothermal condition with the rigid coligand oxalate. The three polymers, which are isomorphous and isostructural, have been structurally characterized by elemental analyses, IR spectroscopy, and single-crystal X-ray diffraction. Each exhibits a 3-D framework constructed from infinite 2-D layers joined by μ ₂-C₂O₄, which are composed of μ ₃-HPhIDC^2? and trivalent lanthanide. Thermal properties have also been investigated.     

Solvothermal syntheses,crystal structures and properties of four polymers built by p-methoxyphenyl imidazole dicarboxylates

By employing 2-(4-methoxyphenyl)-1H-imidazole-4,5-dicarboxylic acid (p-MOPhH₃IDC) to react with Cd(II), Zn(II) and Sr(II) ions, four polymers, [Cd(p-MOPhHIDC)(2,2′-bipy)]_n (2,2′-bipy = 2,2′-bipyridine) (1), [Zn_0.5(p-MOPhH₂IDC)·H₂O]_n (2), {[Cd₄(p-MOPhHIDC)₄(C₂H₅OH)₂(H₂O)₂]·4C₂H₅OH·2H₂O}_n (3) and {[Sr₂(H₂MOPhIDC)₂(C₈H₄O₄)(H₂O)₆]·6H₂O}_n (4) have been solvothermally synthesised and structurally characterised by single-crystal X-ray diffraction. Polymer 1 is a chain with 2,2′-bipy appending in the same side. Polymer 2 is a 2D rhombus grid structure. The π?π interactions between the aromatic groups supply the additional stabilisation for the solid-state structures of 1 and 2. Polymer 3 shows a 3D framework bearing 1D open channels. Polymer 4 exhibits a 2D latticed plane. The thermal and photoluminescence properties of 1–4 have been investigated as well.     

Syntheses,crystal structures,and luminescent properties of three metal coordination polymers based on adipic acid and 2-(pyridine-3-yl)-(1H)-benzimidazole

Three new metal coordination polymers constructed from adipic acid and 2-(pyridin-3-yl)-(1H)-benzimidazole ligands, [M(ADP)(3PBI)₂(H₂O)₂]·2H₂O (M = Ni and Co for 1 and 2, respectively) and [Cd(ADP)(3PBI)(H₂O)] (3) [ADP = adipic acid dianion; 3PBI = 2-(pyridin-3-yl)-(1H)-benzimidazole], have been synthesized by hydrothermal reactions and were characterized by X-ray single-crystal diffraction, elemental analyses, IR, powder X-ray diffraction, and thermogravimetry. Complexes 1 and 2 are isostructural. Both form a 1-D linear chain structure, which is further assembled into a 3-D supramolecular framework by π?π stacking and hydrogen bonding interactions. Complex 3 possesses a binuclear unit and displays a 2-D layer which is further extended to a 3-D supramolecular architecture via hydrogen bonding and other weak packing interactions. The luminescent properties of 3 were investigated in the solid state at room temperature.