Syntheses and solid state structures of zinc (II) complexes with Bi-dentate N-(Aryl)imino-acenapthenone (Ar-BIAO) ligands
作者:SRINIVAS ANGA、SUPRIYA REJ、KISHOR NAKTODE、TIGMANSU PAL、TARUN K PANDA
DOI:10.1007/s12039-014-0756-z
日期:2015.1
We have synthesized five zinc complexes of molecular formulae [ZnCl2(2,6-dimethylphenyl-BIAO)]2 (1a), [ZnBr2(2,6-dimethylphenyl-BIAO)]2 (1b), [ZnI2(2,6-dimethylphenyl-BIAO)]2(1c), [ZnBr2(mes-BIAO)]2(2b) and [ZnBr2(dipp-BIAO)] (3b) with rigid unsymmetrical iminoacenaphthenone ligands, (2,6-dimethylphenyl-BIAO) (1), (mesityl-BIAO) (2) and (2,6-diisopropylphenyl-BIAO) (3). The zinc complex 1a was prepared by the reaction of ZnCl2 and neutral (mesityl-BIAO) (1). However, complexes 1b, 2b and 3b were obtained by the treatment of ZnBr2 and neutral ligands 1–3 respectively in 1:1 molar ratio in dichloromethane at ambient temperature. In a similar reaction of ZnI2 with (2,6-dimethylphenyl-BIAO) (1) in dichloromethane the corresponding iodo-complex 1c was obtained in good yield. All the zinc (II) complexes are characterized by FT-IR, 1H and 13C1H} NMR spectroscopic techniques. The solid state structures of the complexes 1a, 1b, 1c, 2b and 3b are confirmed by single crystal X-ray diffraction analysis. The molecular structures of complexes 1a, 1b, 1c and 2b reveal the dimeric nature of the complexes and subsequently the centre atom zinc is penta-coordinated to adopt distorted trigonal bipyramidal geometry around it. In contrast, the complex 3b is in monomeric in nature due to bulkier size of the ligand and zinc ion is tetra coordinated to adopt distorted tetrahedral geometry.
我们合成了五种锌配合物,其分子式分别为 [ZnCl2(2,6-二甲基苯基-BIAO)]2 (1a), [ZnBr2(2,6-二甲基苯基-BIAO)]2 (1b), [ZnI2(2,6-二甲基苯基-BIAO)]2(1c), [ZnBr2(mes-BIAO)]2(2b) 和 [ZnBr2(dipp-BIAO)] (3b),这些配合物含有刚性的不对称亚胺基苊酮配体,分别是 (2,6-二甲基苯基-BIAO) (1), (2,6-二甲基苯基-BIAO) (2) 和 (2,6-二异丙基苯基-BIAO) (3)。锌配合物 1a 是通过 ZnCl2 与中性 (2,6-二甲基苯基-BIAO) (1) 反应制备的。然而,配合物 1b, 2b 和 3b 是通过 ZnBr2 分别与中性配体 1–3 在二氯甲烷中以 1:1 摩尔比在室温下反应得到的。在类似的反应中,ZnI2 与 (2,6-二甲基苯基-BIAO) (1) 在二氯甲烷中反应,得到了相应的碘配合物 1c,产率良好。所有的锌(II)配合物都通过 FT-IR、1H 和 13C1H} NMR 光谱技术进行了表征。配合物 1a, 1b, 1c, 2b 和 3b 的固态结构通过单晶 X 射线衍射分析得到确认。配合物 1a, 1b, 1c 和 2b 的分子结构揭示了这些配合物的二聚性质,随后中心原子锌采取扭曲的三角双锥几何结构。相比之下,由于配体和锌离子的体积较大,配合物 3b 是单体的,锌离子采取扭曲的四面体几何结构。