Synthesis and Crystal Structures of Co(II) Complexes Derived From Two Unsymmetrical Bis-Heterocyclic Ligands With Benzimidazole Moiety

Jin Huang, Qin Wei, W. Zhang, Zhong Zhang, Yong-Zhi Liao
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Abstract

Treatment of two kinds of unsymmetrical bis-heterocyclic ligands bearing benzimidazole moiety, 2-[2-(1,2,4-triazole-1-yl)ethyl]-1H-benzimidazole (L1) and 2-[2-(1,2,3-benzotriazole-1-yl)ethyl]-1H-benzimidazole (L2), with Co(II) chloride, resulted in two new complexes, [Co3(L2)4Cl6]·2H2O (1) and [Co(L1)Cl2]2 (2), with different aggregating patterns. Two complexes were characterized by single-crystal X-ray determinations. In the solid state, L1 assumes an anti conformation in compound 1, whereas L2 exists as a gauche conformer in compound 2. Complex 1 reveals a 1-D double-stranded chain structure consisting of both octahedrally and tetrahedrally coordinated Co(II) ions. Complex 2 is a mononuclear tetrahedral Co(II) species, which was hydrogen bonded with each other to give a 1-D linear chain.
含苯并咪唑基团的非对称双杂环配体Co(II)配合物的合成及晶体结构
含苯并咪唑基团的2-[2-(1,2,4-三唑-1-基)乙基]- 1h -苯并咪唑(L1)和2-[2-(1,2,3-苯并三唑-1-基)乙基]- 1h -苯并咪唑(L2)两种不对称双杂环配体用Co(II)氯处理后,得到了两种具有不同聚集模式的新配合物[Co3(L2)4Cl6]·2H2O(1)和[Co(L1)Cl2]2(2)。两个配合物通过单晶x射线测定进行了表征。在固体状态下,L1在化合物1中呈反构象,而L2在化合物2中呈间扭构象存在。配合物1是由八面体和四面体配位的Co(II)离子组成的一维双链结构。配合物2是一种单核四面体Co(II),相互氢键形成一维线性链。
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