Abstract

Herein, two nickel(II) complexes [Ni(ntb)(chdc)(CH₃OH)]⋅CH₃OH⋅3.5H₂O (1) and [Ni₂(ntb)₂(btc)(CH₃OH)R]⋅Cl⋅4CH₃OH⋅H₂O (2) (chdc is trans-1,4-cyclohexanedicarboxylate, btc is 1,3,5-benzenetricarboxylate, ntb is tris(2-benzimidazolylmethyl)amine, R = CH₃OH/H₂O) containing tetradentate poly-benzimidazole ligand have been synthesized and characterized by FT-IR spectroscopy, UV-Vis spectroscopy, elemental analysis, single‑crystal X‑ray diffraction, and magnetic analysis. X-ray crystallographic analysis shows that the Ni(II) ions in 1 and 2 have distorted octahedral geometries with four nitrogen atoms of ntb, one oxygen atom of carboxylate and one oxygen atom of H₂O or CH₃OH. Complex 1 is mononuclear with trans-1,4-cyclohexanedicarboxylate coordinated by Ni(II) in monodentate bonding fashion, and complex 2 consists of 1,3,5-benzenetricarboxylato-bridged nickel(II) centers in bis(monodentate) bonding mode. Hydrogen bonds and π–π interactions are important in stabilization of the crystal structures. The variable temperature magnetic susceptibilities of complexes 1 and 2 indicate that there are antiferromagnetic interactions.

中文翻译：

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两个六配位镍 (II) 配合物与三足苯并咪唑配体的合成、晶体结构和磁性研究

摘要

这里，两个镍(II)配合物[Ni(ntb)(chdc)(CH ₃ OH)]· CH ₃ OH· 3.5H ₂ O ( 1 )和[Ni ₂ (ntb ) ₂ (btc)(CH ₃ OH) R]⋅Cl⋅4CH ₃ OH⋅H ₂ O ( 2 ) （chdc 是反式-1,4-环己烷二羧酸盐，btc 是 1,3,5-苯三羧酸盐，ntb 是三（2-苯并咪唑基甲基）胺，R = CH ₃ OH/H ₂合成了含有四齿聚苯并咪唑配体的O)，并通过FT-IR光谱、UV-Vis光谱、元素分析、单晶X射线衍射和磁分析对其进行了表征。X 射线晶体学分析表明，1和2中的 Ni(II) 离子具有扭曲的八面体几何形状，具有 4 个 ntb 氮原子、1 个羧酸盐氧原子和 1 个 H ₂ O 或 CH ₃ OH 氧原子。配合物1是由 Ni(II) 以单齿键合方式配位的反式-1,4-环己烷二羧酸盐的单核，配合物2由双（单齿）键合模式的 1,3,5-苯三羧基桥连的镍 (II) 中心组成。氢键和 π-π 相互作用对于稳定晶体结构很重要。配合物1和2的可变温度磁化率表明存在反铁磁相互作用。