Synthesis, structure, spectroscopic, magnetic and electrochemical studies of a rare syn–anti acetate-bridged copper(II) complex

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• 作者：Hassan Hadadzadeh ; S. Jamil A. Fatemi ; Seyedeh Raziyeh Hosseinian ; Hamid Reza Khavasi ; Rainer Pö ; ttgen
• 关键词：Crystal structure ; Copper(II) ; Magnetic moment ; Cyclic voltammetry ; syn– ; anti coordination mode
• 刊名：Polyhedron
• 出版年：2008
• 出版时间：20 January 2008
• 年：2008
• 卷：27
• 期：1
• 页码：249-254
• 全文大小：497 K

文摘

The structure, spectroscopy and electrochemical properties of a novel dinuclear copper(II) complex, [{Cu(phen)₂}₂(μ-CH₃COO)][PF₆]₃ where phen = 1,10-phenanthroline, is reported. The crystal structure contains two independent Cu(II) ions, with different geometry around each copper center, which are bridged by an acetate anion. The acetate-bridged ligand shows a syn–anti coordination mode with a trigonal bipyramidal geometry for the Cu(1) center and a distorted square-based pyramidal geometry for the Cu(2) center. The angular structural index parameter τ for Cu(1) and Cu(2) is 0.9 and 0.33, respectively. The copper(II) atoms display a different geometry with a N₄O chromophore group and with Cu–O distances of 1.993(5)–1.996(5) Å and Cu–N distances which vary from 1.980(5) to 2.161(6) Å. The intra Cu…Cu separation is 4.9904(5) Å. The effective magnetic moment (μ_eff) of the complex was measured by the Evans method. The cyclic voltammogram of [{Cu(phen)₂}₂(μ-CH₃COO)][PF₆]₃ shows two waves at positive potential which are assigned to the two Cu(II/I) reduction couples.