Singh Vinod P
Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi 221005, Uttar Pradesh, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Nov 1;71(1):17-22. doi: 10.1016/j.saa.2007.11.004. Epub 2007 Nov 21.
This paper describes the preparation of Cu(bh)2(H2O)22], [Cu(ibh)2(NO3)2], Cu(ibh)2(H2O)22 and [Cu(iinh)2(NO3)2] (bh = benzoyl hydrazine (C6H5CONHNH2); ibh = isonicotinoyl hydrazine (NC5H4CONHNH2); ibh = isopropanone benzoyl hydrazone (C6H5CONHN=C(CH3)2; iinh = isopropanone isonicotinoyl hydrazone (NC5H4CONHN=C(CH3)2). These copper(II) complexes are characterized by elemental analyses, molar conductances, dehydration studies, ESR, IR and electronic spectral studies. The electronic and ESR spectra indicate that each complex exhibits a six-coordinate tetragonally distorted octahedral geometry in the solid state and in DMSO solution. The ESR spectra of most of the complexes are typically isotropic type at room temperature (300 K) in solid state as well as in DMSO solution. However, all the complexes exhibit invariably axial signals at 77 K in DMSO solution. The trend g(||) > g(perpendicular) > g(e,) observed in all the complexes suggests the presence of an unpaired electron in the d x2-y2 orbital of the Cu(II). The bh and inh ligands bond to Cu(II) through the >C=O and -NH2 groups whereas, ibh and iinh bond through >C=O and >C=N- groups. The IR spectra of bh and ibh complexes also show H-O-H stretching and bending modes of coordinated water.
本文描述了Cu(bh)2(H2O)22]、[Cu(ibh)2(NO3)2]、Cu(ibh)2(H2O)22和[Cu(iinh)2(NO3)2]的制备（bh = 苯甲酰肼（C6H5CONHNH2）；ibh = 异烟酰肼（NC5H4CONHNH2）；ibh = 丙酮苯甲酰腙（C6H5CONHN=C(CH3)2；iinh = 丙酮异烟酰腙（NC5H4CONHN=C(CH3)2）。这些铜（II）配合物通过元素分析、摩尔电导率、脱水研究、电子顺磁共振（ESR）、红外光谱（IR）和电子光谱研究进行表征。电子光谱和ESR光谱表明，每个配合物在固态和二甲基亚砜（DMSO）溶液中均呈现六配位的四方畸变八面体几何构型。大多数配合物在固态以及DMSO溶液中，于室温（300 K）时的ESR光谱通常为各向同性类型。然而，所有配合物在77 K的DMSO溶液中均始终呈现轴向信号。在所有配合物中观察到的g(||) > g(垂直) > g(e,)趋势表明在Cu（II）的dx2 - y2轨道中存在一个未成对电子。bh和inh配体通过>C=O和 - NH2基团与Cu（II）键合，而ibh和iinh则通过>C=O和>C=N - 基团键合。bh和ibh配合物的红外光谱还显示了配位水的H - O - H伸缩和弯曲模式。
