Synthesis,Crystal Structures,Luminescence, Biological and Catalytic Properties of Two d10 Metal-Organic Coordination Polymers Constructed from Mixed Ligands

Two d¹⁰ metal-organic coordination polymers, [Cd₂(4-cpa)₄(bmip)₂]_n (1) and [Zn(4-cpa)₂(4,4′-bpy)]_n (2), [4-cpa = 4-chlorophenylacetate, bmip = 1,3-bis(2-methylimidazoly)propane, 4,4′-bpy = 4,4′-bipyridine], were hydrothermally synthesized and characterized by IR spectroscopy, elemental analysis, thermogravimetric analysis (TGA), powder X-ray diffraction and single-crystal X-ray diffraction. Single-crystal X-ray diffraction studies indicated that both 1 and 2 display analogous wave-like infinite chain structures. The two coordination polymers are further extended into 3D supramolecular structures through π···π stacking interactions and C–H···O hydrogen bonds for 1 and π···π stacking interactions, C–H···π stacking interactions and C–H···O hydrogen bonds for 2. Both 1 and 2 emit the intense blue luminescence at room temperature. The 4-Hcpa ligand and complexes 1 and 2 have been screened for their herbicidal activities against Brassica napus L. and Echinochloa crusgalli L. The results are compared with the activity of quizalofop-P-ethyl. Both compounds exhibit high catalytic properties on degradation of methyl orange in Fenton-like process.     

Syntheses, Structures, and Luminescent Properties of Two Novel Coordination Polymers with Mixed Ligands

Two novel metal–organic coordination polymers {[Pb₂(MIP)₂(BDC)₂]·H₂O} _n 1 and [Cd(MIP)(NDC)] _n 2 [MIP = 2-(3-methoxyphenyl)-1H-imidazo [4,5-f] [1, 10] phenanthroline, BDC = terephthalic acid, NDC = naphthalene-1,4-dicarboxylic acid] were obtained from hydrothermal reaction and characterized by elemental analysis, thermogravimetric (TG) analysis, infrared spectrum (IR) and single-crystal X-ray diffraction. The coordination polymers crystallize in triclinic, space group P-1 with a = 1.0335(2), b = 1.4224(3), c = 1.8156(4) nm, β = 106.088(3)° for complex 1 and the complex 2 crystallizes in monoclinic, space group P2(1)/n with a = 1.2562(8), b = 1.4800(9), c = 1.3723(8) nm, β = 97.257(1)°, respectively. The metal ions Pb(II) are located in [:PbN2O4] pentagonal bipyramidal geometry in complex 1. The metal ions Cd(II) in complex 2 act as distorted octahedral geometry, being surrounded by four carboxylate oxygen atoms from three NDC ligands and two donor nitrogen atoms from one MIP molecule. Moreover, there are hydrogen bonds in the two complexes, and it is noteworthy that the existence of hydrogen bonds and π–π interactions reinforce the structural stability of the title complexes, which have been proved by TG analysis. The luminescent properties for the ligand MIP, NDC and complex 2 are also discussed in detail.     

New Zn/Cd Coordination Polymers Constructed from Mixed Ligands: Crystal Structures and Photocatalytic Performances Toward Organic Dyes Degradation

Two coordination polymers (CPs), Cd(bpp)(H₂O)L (BUC-18) and Zn(bpp)L (BUC-19), (H₂L?=?cis-1,3-dibenzyl-2-imidazolidone-4,5-dicarboxylic acid, bpp?=?1,3-bis(4-pyridyl)propane), have been synthesized under hydrothermal conditions, and characterized by single crystal X-ray analysis, Fourier transform infrared spectra (FTIR), thermogravimetric analyses (TGA), CNH element analysis and UV–Vis diffuse reflectance spectra (UV–Vis DRS). Upon the UV light irradiation, BUC-19 exhibited excellent photocatalytic performances toward methylene blue (initial concentration 10 mg L^?1), methyl orange (initial concentration 10 mg L^?1) and reactive red X-3B (initial concentration 50 mg L^?1) with degradation efficiency of 93, 80 and 92%, respectively. The possible mechanism was proposed, which was further confirmed by trapping experiments.     

Two New Zn(II) Coordination Polymers Constructed from Asymmetric Biphenyl-Dicarboxylate and Imidazole-Containing Ligands: Structures and Photoluminescent Properties

Two new coordination polymers, [Zn(2,4′-bpdc) (L₁)_0.5·(H₂O)] _n (1) and {[Zn(3,4′-bpdc) (L₁)]·(H₂O)} _n (2), have been obtained from hydrothermal reactions of zinc (II) nitrate with the ligands 1,4-bis(imidazol-1-yl)benzene (L) and two asymmetric biphenyl-dicarboxylate [biphenyl-2,4′-dicarboxylate (2,4′-bpdc) and biphenyl-3,4′-dicarboxylate (3,4′-bpdc)]. Single-crystal X-ray diffraction analysis the two coordination polymer show different structures due to the different dicarboxylate ligands. Complex 1 features a 3D mab topological net. Complex 2 is unusual case that has 3D frameworks constructed from 2D 4⁴-sql layers by parallel polycatenation. The photoluminescent properties of 1 and 2 have also been investigated.     

Construction of Three New Coordination Polymers Based on Dicarboxylate and Different Organic N-Donor Ligands

Three new metal coordination polymers, {[Ni₂(L₁)₂(bip)₂]·H₂O} _n (1), [Zn₂(L₂)₂(bih)_0.5] _n (2) and [Cd(L₂)(bih)_0.5] _n (3) [H₂L₁?=?2-(3-carboxyphenoxy)benzoic acid, H₂L₂?=?2-(4-carboxyphenoxy) benzoic acid, bip?=?4,4??-bis(2-imidazol-1-ylmethyl) biphenyl and bih?=?1,6-bis(2-methylimidazol-1-yl) hexane], have been synthesized and structurally characterized by elemental analysis, IR and X-ray diffraction. Compound 1 is a one-dimensional ladder-like chain structure. Compound 2 is a two-dimensional layer structure. In compound 3, the alternate arrangement of the right- and left-handed helical chains through bih ligands interactions, which lead to form a two-dimensional framework. In compound 1, 2 and 3, the L₁ and L₂ ligands act as bridging ligands, exhibiting three coordination modes to link metal ions: bis-monodentate, bidentate chelating and monodentate modes. Moreover, the luminescent properties of compound 2 and 3 were also investigated in this work.     

Two 3D Coordination Polymers with New Topology Based on Mixed Ligands: Synthesis,Structure, and Photoluminescence Properties

Employing tetracarboxylate and imidazole mixed ligands to react with different transition meat salts afford two new 3D coordination polymers, {[Zn₂(BPTC)(BBI)₂]·(H₂O)₃·DMSO}_n (1) and {[Cd₂(BPTC)(BBI)₂]·H₂O}_n (2) (H₄BPTC?=?biphenyl-3,3′,4,4′-tetracarboxylic acid, BBI?=?1,1′-(1,4-butanediyl)bis(imidazole)). Both these two coordination polymers are 4-connected network topologies. Compound 1 features a unprecedented 3-nodal (4,4,4)-connected network topology with the point symbol {6⁴·8²}, and 2 displays a (4,4)-connected binodal network bearing new topology with the point symbol of {7²·8⁴}2{7³·8³}. Additionally, thermal stability and photoluminescence properties of 1 and 2 were investigated.     

Syntheses, Structures, and Luminescent Properties of Two Novel Coordination Polymers with Poly-Carboxylate and N-Heterocyclic Ligands

Two novel metal–organic coordination polymers {[Pb(CIPT)(1,4-BDC)]·2H₂O} _n 1 and {[Zn₂(IPDT)₂(1,4-BDC)₂(H₂O)].3H₂O} _n 2 [CIPT = 2-(3-chlorophenyl)-1H-imidazo[4,5-f][1,10]phenanthroline, 1,4-BDC = terephthalic acid, IPDT = 4-(1H-imidazo[4,5-f][1,10]phenanthroline-2-yl)-2,6-dimethoxyphenol] were obtained from hydrothermal reaction and characterized by elemental analysis, thermogravimetric (TG) analysis, IR and single-crystal X-ray diffraction. Both of the two coordination polymers exhibit one-dimensional (1D) infinite chain structures through non-covalent interactions, and the existence of hydrogen bonds interactions lead the 1D chain to 2D layer structures. It is noteworthy that the existence of hydrogen bonds reinforces the structural stability of the complexes 1 and 2, which can be proved by TG analysis. The photoluminescent study of coordination polymer 1 shows that it exhibits fluorescent emission band at 637 nm, which is red-shifted by 46 nm relative to the free ligand CIPT.     

Imidazole-Containing Ligands Assisted Self Assembly of Two New Cd(II) Coordination Polymers: Syntheses, Crystal Structures and Photoluminescent Properties

Two new coordination polymers, {[Cd₂(PDC)₂(H₂O)₂(L₁)]·2H₂O}_n (1) and {[Cd (2,5-PDC)(H₂O)(L₂)]·H₂O}_n (2), have been obtained from hydrothermal reactions of Cd²⁺ ion with the 2,5-pyridinedicarboxylic acid (H₂PDC) and two imidazole-containing ligands [L₁ = 1,4-bis(imidazol-1-yl)benzene and L₂ = 1,4-bis(1-imidazol-yl)-2,5-dimethylbenzene]. Complex 1 features a three-dimensional 6-connected rob topological net. Complex 2 shows a two-dimensional 6-connected hxl topological net. The structural differences between 1 and 2 demonstrate that the different imidazole-containing ligands play critical roles in the formation of the resulting frameworks. The photoluminescent properties of 1 and 2 have also been investigated.     

Two 3D Supramolecular Coordination Polymers Constructed from Aromatic Carboxylic Acids and Flexible Bis(thiabendazole) Ligands

Two coordination polymers (CPs), [Zn(L1)(H₂bta)] (1) and [Co(L2)(ndc)]·0.75H₂O (2), (L1?=?1,6-(thiabendazole)hexane), L2?=?1,3-(thiabendazole)propane, H₄bta?=?1,2,4,5-benzenetetracarboxylic acid, H₂ndc?=?2,6-naphthalenedicarboxylic acid) have been hydrothermally synthesized and characterized. Single crystal X-ray diffraction analyses reveal that CP 1 and CP 2 feature 1D infinite zigzag and “Ω”-like chains, and further extend into 3D supramolecular framework by O–H?O and C–H?O hydrogen bonding interactions, respectively. Furthermore, the luminescence properties, thermal stability, and catalytic degradation of methyl orange in a Fenton-like process are also investigated in detail.     

Hydrothermal Synthesis, Crystal Structures and Fluorescent Properties of Two New d10 Metal Coordination Polymers with Two Mixed Flexible Ligands

Two complexes, [Zn(qda)(bpp)] _n (1) and {[Cd(qda)(bpp)₂]·2H₂O} _n (2), (H₂qda?=?hydroquinone-O,O′-diacetic acid, bpp?=?1,3-bis(4-pyridyl)propane), were hydrothermally synthesized and characterized by single crystal X-ray diffraction analysis, FTIR and elemental analysis. Both compounds exhibit two-dimensional structures. The qda anions in compound 1 adopt two different trans conformations, coordinating to Zn²⁺ ions in a monodentate fashion, while in compound 2 they adopt only one trans conformation yet keeping the same coordination fashion as in compound 1. The bpp molecules show same anti-gauche coordination conformation in both 1 and 2. In addition, photoluminescence for 1 and 2 has been investigated in the solid state at room temperature.     

Synthesis,Structures, and Catalytic Properties of Two Zinc(II) Coordination Polymers Constructed from Polycarboxylate and Bis(Benzimidazole) Ligands

Two Zn(II) coordination polymers, formulated as {[Zn(L1)_0.5(btc)_0.5(H₂O)]·H₂O} _n (1) and {[Zn(L2)(1,4-ndc)]·2H₂O} _n (2) [L1 = 1,4-bis(2-methylbenzimidazole-1-ylmethyl)benzene, L2 = 1,4-bis(2-methylbenzimidazole)butane, H₄btc = butane-1,2,3,4-tetracarboxylic acid, 1,4-H₂ndc = 1,4-naphthalenedicarboxylic acid] have been synthesized and structurally characterized by single crystal X-ray diffraction. Complex 1 features a 3D (3,4)-connected network with the topology of fsh-3,4-P2₁/c. Complex 2 is a 2D (4,4) grid with sql topology and further extends into a 3D supramolecular framework by π–π stacking interactions. In addition, the thermal stability, fluorescence, and catalytic properties of two complexes for degrading methyl orange dye in a Fenton-like process were investigated.     

Syntheses and Characterization of Three Coordination Polymers of Zinc(II) and Cadmium(II) with Dicarboxylates and Bis(thiabendazole) Ligands

Three d ¹⁰ coordination polymers formulated as [Zn(L1)₂(mip)] _n (1), [Zn(L1)(2,6-ndc)] _n (2) and [Cd(L2)_0.5(bpdc)] _n (3) (L1 = 1,1′-(1,3-propanediyl)bis(thiabendazole), L2 = 1,1′-(1,6-hexanediyl)bis(thiabendazole), H₂mip = 5-methylisophthalic acid, 2,6-H₂ndc = 2,6-naphthalenedicarboxylic acid, H₂bpdc = 4,4′-biphenyldicarboxylic acid) were hydrothermally synthesized. Complexes 1–3 were characterized by elemental analysis, IR spectroscopy, X-ray powder diffraction analysis, and single crystal X-ray diffraction. Complexes 1 and 2 present different chain structures, both of them are extended into 2D supramolecular architectures via C–H···O hydrogen bonds, while 3 is a three-fold interpenetrating three-dimensional framework with binodal 4,4-connected mog topology. The thermal stability, UV–visible spectroscopy and luminescence properties of complexes 1–3 were also examined. Furthermore, complex 3 exhibits relatively positive catalytic activity towards the degradation of methyl orange in a Fenton-like process.