Mononuclear Cd(II) and Zn(II) complexes with the 1,2-cyclohexanedionedioxime ligand: Preparation and structural characterization

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• 作者：Eduard B. Coropceanu^a ; ^{ecoropceanu@yahoo.com} ; Lilia Croitor^b ; Marina S. Fonari^b ; ^{fonari.xray@phys.asm.md}
• 关键词：Crystal structures ; IR spectroscopy ; Cadmium(II) ; Zinc(II) ; Molecular building unit ; 1 ; 2-Cyclohexanedionedioxime
• 刊名：Polyhedron
• 出版年：2012
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：11 May, 2012
• 卷：38
• 期：1
• 页码：68-74
• 文件大小：921 K

摘要

Three mononuclear mixed-ligand Cd(II) and Zn(II) dioximes with the compositions [Cd(HCOO)₂(NioxH₂)₂] (1), [Cd(CH₃COO)₂(NioxH₂)(Im)₂]路H₂O (2) and [Zn(SO₄)(NioxH₂)₂(H₂O)]路DMF路2H₂O (3), and the Zn(II) dioximate [Zn(NioxH)₂(An)₂]路4H₂O (4) (where NioxH₂ = 1,2-cyclohexanedionedioxime, Im = imidazole, An = aniline, DMF = N,N鈥?dimethylformamide) were prepared and their structures were determined by single-crystal X-ray crystallography. The structural determination revealed that the coordination geometry around the Cd/Zn centers is distorted octahedral in each complex. In the molecular units 1, 2 and 3, the metal atoms have N₄O₂ environments, while in complex 4, the Zn(II) cation has an N₆ coordination core. The impact of different ligands on the stereochemistry of the metal center is elucidated. The hydrogen bonds, being the driving forces in the generated self-association patterns, are discussed.