Structure and Properties of Ni(Ⅱ) and Cu(Ⅱ) Metal Complexes Coordinated by Two Ligands

Abstract

Abstract: In this paper, two coordination polymers containing imidazole ligands and dicarboxylic ligands were prepared by hydrothermal synthesis method: {Ni(nip)(p-bix)(H₂O)₂}_n (1) and{Cu(bbi)(dgc)}_n (2) (nip = 5-Nitroisophthalic acid; p-bix=1,4-Bis(imidazolyl-1-methyl)benzene; bbi=1,1’-(1,4-Butanediyl)diimidazole; dgc=3,3-Dimethylglutaric acid). The complexes were characterized by X-ray single crystal diffraction, elemental analysis, PXRD and TGA. The results show that the complex 1 is an one-dimensional double-stranded structure with a regular and ordered pore structure, and the nitro group (—NO₂) of 5-nitroisophthalic acid (nip) in the pore structure endows metal-organic frame (MOF) with potential application value. Futhermore, it is further extended into a 3D supramolecular architecture via strong hydrogen bonding interactions. While complex 2 featured a 3D network with a 4-connecte {6⁵·8} topological structure, and two mixed ligands of imidazole derivative ligand (bbi) and carboxylic acid ligand (H₂dgc) spirally coiled out an regular pore structure. It was rather remarkable that there are also abundant hydrogen bonds in the structure, which consolidate its 3D framework. In addition, the magnetic property of the two complexes was also investigated at 2 K to 300 K with an external magnetic field of 1 000 Oe and magnetic susceptibility datas were rationally fitted with the Curie-Weiss Law in the measured temperature range with θ=1.73 K and 6.78 K, respectively, indicating weak ferromagnetic interactions among metal ions in two complexes.

Key words: metal-organic frame work, coordination polymer, hydrothermal synthesis, imidazole derivative, ferromagnetic interaction, channel structure

CLC Number:

O641.4

DAI Siyu, LIU Yuqi, LI Yanghua, WANG Xinying, LI Wei, ZHANG Qingqing. Structure and Properties of Ni(Ⅱ) and Cu(Ⅱ) Metal Complexes Coordinated by Two Ligands[J]. JOURNAL OF SYNTHETIC CRYSTALS, 2021, 50(12): 2283-2292.

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