Synthesis, Crystal Structures, and Magnetic Studies of Two Six-Coordinate Nickel(II) Complexes with Tripodal Benzimidazole Ligands

IF 1.8 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR Russian Journal of Inorganic Chemistry Pub Date : 2022-06-13 DOI:10.1134/S0036023622080162

Yuhang He, Jingwen Chen, Xinran Yu, Hongming Kao, Jing Chen

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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.

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两种六配位三足苯并咪唑镍配合物的合成、晶体结构和磁性研究

本文合成了两种镍(II)配合物[Ni(ntb)(chdc)(CH3OH)]⋅CH3OH⋅3.5H2O(1)和[Ni2(ntb)2(btc)(CH3OH)R]⋅Cl⋅4CH3OH⋅H2O (2) (chdc为反式-1,4-环己二羧酸盐，btc为1,3,5-苯三羧酸盐，ntb为三(2-苯并咪唑甲基)胺，R = CH3OH/H2O)含四齿多苯并咪唑配体，并通过红外光谱、紫外-可见光光谱、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结构，其中四个氮原子为ntb，一个氧原子为羧酸盐，一个氧原子为H2O或CH3OH。配合物1是由Ni(II)以单齿键方式配位的反式-1,4-环己二羧酸盐组成的单核配合物，配合物2由1,3,5-苯三羧酸桥接镍(II)中心以双(单齿)键方式组成。氢键和π -π相互作用是晶体结构稳定的重要因素。配合物1和2的变温磁化率表明存在反铁磁相互作用。

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来源期刊

Russian Journal of Inorganic Chemistry 化学-无机化学与核化学

CiteScore

3.10

自引率

38.10%

发文量

237

审稿时长

3 months

期刊介绍： Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.