Synthesis, characterization, crystal structure and theoretical approach of Cu(II) complex with 4-{(Z)-[(2-hydroxybenzoyl)hydrazono]methyl}benzoic acid

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• 作者：Shi-Liang Chen^a ; Zheng Liu^a ; ^{lisa4.6@163.com} ; Jie Liu^a ; Guo-Cheng Han^b ; Yan-Hong Li^c ; ^d
• 关键词：Salicylhydrazide ; 4-Formylbenzoic acid ; Crystal structure ; Fluorescence property ; Electrochemical property ; DFT calculations
• 刊名：Journal of Molecular Structure
• 出版年：2012
• 期刊代码：62_00222860
• 类别：ch
• 出版时间：25 April, 2012
• 卷：1014
• 期：Complete
• 页码：110-118
• 文件大小：971 K

摘要

The metal complex of [CuL₂]路2DMF (L = 4-{(Z)-[(2-hydroxybenzoyl)hydrazono]methyl}benzoic acid, DMF = N,N-dimethylformamide) (1) had been synthesized and characterized by spectral method(IR), UV-Vis electronic absorption spectra, fluorescence spectra, elemental analysis, electrochemistry, thermal analysis (TG, DTG) and single crystal X-ray diffraction techniques. In the complex, the ligands act as univalent anion bidentate and coordination takes place in the enol tautomeric form with the enolic oxygen and azomethine nitrogen atoms. Molecular geometry from X-ray experiment of the title compound in the ground-state has been compared using the density functional method (B3LYP) and LANL2DZ basis set. DFT calculations at B3LYP/LANL2DZ level of theory prove that the electronic spectra of CuL₂路2DMF is attributed to intra-complex electronic transitions as well as 蟺-蟺^* electronic transitions. Also, Mulliken charge analysis, natural bond orbitals (NBO), Wiberg bond index and frontier molecular orbitals (FMO) were performed at B3LYP/LANL2DZ level of theory. In addition, complex 1 exhibits strong photoluminescent emission at room temperature. The electrochemical studies reveal that redox of Cu²⁺/Cu⁺ in the complex are quasi-reversible processes. The result of TG analysis shows that the title complex was stable under 100.0 掳C.