The Synthesis, Spectroscopic and Structural Study of a Copper(II) Complex with a (3-py)2Hg Linker: A Zig-Zag Chain Paddle-Wheel Coordination Polymer

Two one-dimesional (1D) coordination polymers (CPs) [Cu2(μ 2-OAc)4(μ 2-bpt)] n (1) and [Cu(μ t-DMF)(μ t-NO3)2(μ 2-bpmh)] n (2) (DMF = N,N-dimethylformamide) based on copper(II) salts and 3,5-bis(4-pyridyl)-1,2,4-triazole (bpt) and 1,2-bis(pyridin-4-ylmethylene)hydrazine (bpmh) have been synthesized under different conditions, respectively; and characterized by single-crystal X-ray diffraction, elemental analysis, thermogravimetric analyses, powder X-ray diffraction, fluorescence analysis, fourier transforming infrared and ultraviolet–visible spectroscopies. CP 1 shows an infinite 1D zigzag chain with paddle-wheel shaped [Cu2(μ 2-OAc)4] secondary building units (SBUs) and μ 2-bpt V-shaped dipyridyl ligands. The Cu···Cu distance in the [Cu2(μ 2-OAc)4] core is 2.631(18) A, supporting the Cu···Cu interaction. Cu(II) in CP 2 also adopts five-coordinated mode but in trigonal bipyramidal geometry which is completed by three O atoms from nitrates and DMF and also two N atoms from adjacent bpmh to form an infinite 1D linear chain. Furthermore, the magnetism property of CP 1 was investigated. Its results show that CP 1 indicated antiferromagnetic behavior. In addition, CPs 1 and 2 display fluorescence quenching compared with corresponding free ligands at room temperature. CPs 1 and 2 were hydrothermally synthesized and solution interdiffusion procedure, respectively. Both of which show 1D infinite zigzag chain but pack in different patterns. CP 1 shows an infinite 1D zigzag chain with paddle-wheel shaped [Cu2(μ 2-OAc)4] secondary building units (SBUs) and μ 2-bpt V-shaped dipyridyl ligands. Cu(II) in CP 2 also adopts five-coordinated mode but in trigonal bipyramidal geometry which is completed by three O atoms from nitrates and DMF and also two N atoms from adjacent bpmh to form an infinite 1D linear chain. CP 1 shows antiferromagnetic behavior. Both CPs 1 and 2 display fluorescence quenching compared with corresponding free ligands at room temperature.

Metal-directed assembly of two one-dimensional coordination polymers: Structural, theoretical, fluorescent and non-linear optical studies

Syntheses, structures, and properties of three mixed-ligand complexes based on 3,6-bis(imidazole-1-yl)pyridazine

Syntheses, crystallization and selective dye adsorption of three Co(II) coordination polymers via one-pot reaction

Desolvation–Solvation-Induced Reversible On–Off Switching of Two Memory Channels in a Cobalt(II) Coordination Polymer: Overlay of Spin Crossover and Structural Phase Transition

Diversified architectures of one-dimensional zinc(II) and cadmium(II) coordination polymers incorporating bipyridyl ligands: Syntheses, structures, theoretical studies, fluorescent and nonlinear optical properties

Two mercury(II) halide coordination polymers with efficient photoluminescence

Ligand Modified and Light Switched On/Off Single-Chain Magnets of {Fe ₂ Co} Coordination Polymers via Metal-to-Metal Charge Transfer

A new coordination polymer {[Zn2(dpb)2(bdc)2]·1.03H2O}n(1) was prepared under solvothermal condition using terephthalate(1,4-H2bdc) as well as 1,3-dipyridyl benzene(1,3-dpb) as initiators. The complex was characterized by means of infrared spectroscopy(IR), thermogravimetric analysis(TGA), powder X-ray diffraction(XRD) and X-ray single-crystal diffraction. The results indicate that complex 1 crystallizes in the monoclinic system with space group of P21/c. The neighboring Zn(II) ions are linked by ligand dpb to form infinitely meso-helical or zigzag chains, which are further connected to form a two-fold interpenetrated 3D framework, in which there exists strong hydrogen bonds(O—H···O) between the interpenetrated frameworks. In addition, the solid-state fluorescence behavior of complex 1 was also discussed.

In a systematic study, six pseudopolymorphic coordination polymers containing the ditopic 1,3-di(pyridin-4-yl)urea ligand (4bpu) constructed with d10 metal cations, possessing the formula {[M(4bpu)I2]S}n [(M = Zn, Cd and Hg), (S = MeOH or EtOH)], namely Zn-MeOH, Zn-EtOH, Cd-MeOH, Cd-EtOH, Hg-MeOH and Hg-EtOH were obtained. The title compounds were characterized by single-crystal X-ray diffraction analysis (SC-XRD), elemental analysis (CHN), FT-IR spectroscopy, thermogravimetric analysis (TGA), and powder X-ray diffraction (PXRD). The diffraction studies show that these compounds are isostructural 1D zig-zag chain coordination polymers which is also confirmed using XPac 2.0.2 software and the occurrence of three- and one-dimensional (3D and 1D) isostructurality was investigated in terms of their molecular assembly in solid state structures. These comparisons were performed by extracting the dissimilarity index and stretching parameters, providing quantitative insights into the structural similarity across the pseudopolymorphic coordination polymers, which exhibit robust 3D isostructurality. Additionally, the geometry of the zig-zag chain structures was thoroughly analyzed, highlighting the subtle variations and common features that contribute to isostructurality. The supramolecular architecture of these pseudopolymorphs is stabilized by robust and repetitive hydrogen bonding motifs involving N-H⋯O, O-H⋯I and C-H⋯I interactions between the framework and guest solvent molecules (MeOH or EtOH). These interactions replace the commonly observed bifurcated hydrogen bonds (α-tape motif) between urea moieties, emphasizing the pivotal role of solvent molecules in controlling pseudopolymorphism and defining the final structural assembly. This detailed understanding of hydrogen bonding provides valuable insights into tailoring intermolecular interactions, enabling the design of materials with enhanced functionalities for diverse applications. A detailed investigation of urea-CO⋯πpy interactions in urea-based compounds highlights the classification of these interactions as semilocalized (η2-SL) based on geometric parameters and reveals their significance through crystallographic and database studies. Hirshfeld surface analysis has been performed for all compounds to determine the percentage contribution of intermolecular interactions.

Two coordination polymers, {[Ni0.5(4,4′-bib)Cl][(4,4′-bib)0.5]·H2O} n (1) and {[Co(4,4′-bib)3(H2O)2][NO3]2·H2O} n (2) (4,4′-bib = 4,4′-bis(imidazol-1-yl)biphenyl) have been hydrothermally synthesized. Their structures have been determined by single-crystal X-ray diffraction analyses and are further characterized by elemental analyses, IR, thermogravimetric analyses, and powder X-ray diffraction. In 1, each NiII is linked by four μ 2–4,4′-bib ligands in 2-D (4,4)-networks, which are further connected through host–guest interaction to form a 3-D packing diagram with 1-D channels. In 2, each CoII is linked by two μ 2–4,4′-bib and two μ 1–4,4′-bib ligands in a 1-D zigzag chain, further connected through non-covalent interactions (including O–HN, O–HO, C–Hπ, and ππ interactions) to form a 3-D supramolecular structure. 4,4′-bib exhibits μ 2-, μ 1-, and μ 0-coordination during the construction of 1 and 2. From the topological view, the overall structures of 1 and 2 possess (46) topology.

Solvothermal reactions of aromatic quaterphenyl-2,5,2′,5′-tetracarboxylic acid (H4qptc) ligand and transitional metal cations of MII (M = Co, Ni, Mn, Cu, Zn) in the presence of 1,10-phenanthroline (phen) afford five new coordination polymers (CPs), namely, {[M(H2qptc)(phen)(H2O)2]·2H2O}n (M = Co (1), Ni (2)), [Mn(qptc)0.5(phen)(H2O)]n (3), [Cu(qptc)0.5(phen)]n (4) and [Zn3(Hqptc)2(phen)2(H2O)2]n (5). Their structures have been determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses, IR spectra, powder X-ray diffraction (PXRD) and thermogravimetric (TG) analyses. Complexes 1 and 2 are isostructures and each displays a one-dimensional (1D) zigzag chain, which further forms a 2D supramolecular architecture via inter-chain π⋯π interactions. Complex 3 possesses a (3,6)-connected CdI2 layered architecture incorporating left- and right-handed helical chains. Complex 4 exhibits a 3D porous structure with rare (3,6)-connected ant topology. Complex 5 shows a 3D (3,4,5)-connected network with (42.6)2(43.62.8)(45.64.8)2 topology. The results show that the conformations and coordination modes of H2qptc2−/qptc4− ligand are crucial factors for the formation of the different structures. Moreover, the photoluminescence of 5 has been investigated.

Postsynthesis of the paramagnetic square-shaped complex {[(Tp*Me)Fe(μ-CN)2(CN)][Co(dmbpy)2]}2(BPh4)2·6MeCN·H2O [1, Tp*Me = tris(3,4,5-trimethylpyrazole)-borate; dmbpy = 4,4′-dimethyl-2,2′-bipyridin...

Two Zn(II)/Cd(II) coordination polymers based on 5-(3,5-dicarboxybenzyloxy)isophthalic acid for selective detection 4-nitrophenol and fluazinam in aqueous medium

Two new coordination polymers constructed from 5-sulfoisophthalic acid sodium salt (NaH2SIPA) and Co or Cu cations, [Co3(SIPA)2(4,4′-bpy)4(H2O)6]·4H2O (1) and [Cu6O3(HSIPA)3(4,4′-bpy)6(H2O)3]·7H2O (2), have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction (SXRD), powder X-ray diffraction (PXRD), IR spectroscopy, thermogravimetric analysis, UV-Vis spectroscopy, and elemental analysis. Compound 1 represents a twofold-interpenetrating 3-D framework based on Co, SIPA, and 4,4′-bipyridine ligands with a qzd topology. Different from 1, compound 2 shows a 3-D self-penetrating framework based on Cu, HSIPA, and 4,4′-bipyridine ligands. Furthermore, the photocatalytic performance in reduction of CO2 of 1 under visible light was investigated.