Synthesis, crystal structure, magnetic and electrochemical studies of two copper complexes with carboxylate rich dinucleating ligand

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• 作者：Rebecca A. Joy ; Hadi Arman ; Shengchang Xiang ; Ghezai T. Musie ; ^{ghezai.musie@utsa.edu}
• 关键词：Copper complexes ; Polynuclear complexes ; Dinucleating ligands ; Magnetic properties ; Electrochemistry
• 刊名：Inorganica Chimica Acta
• 出版年：2013
• 出版时间：1 January, 2013
• 年：2013
• 卷：394
• 期：Complete
• 页码：220-228
• 全文大小：1184 K

文摘

Three new copper compounds of a symmetric dinucleating ligand, N,N¡ä-bis[2-carboxybenzomethyl]-N,N¡ä-bis[carboxymethyl]-1,3-diaminopropan-2-ol (H₅ccdp) with diverse coordinating groups, have been synthesized and studied in the solid state as well as in solution. In acetonitrile/H₂O solution, the reaction of stoichiometric amounts of Cu(NO₃)₂¡¤2.5H₂O and the ligand H₅ccdp, in the presence of K₂CO₃, produced a dinuclear copper compound, K₃[Cu₂(ccdp)(¦Ì-CO₃)]¡¤7H₂O¡¤C₃H₆O, K₃[1]¡¤7H₂O¡¤C₃H₆O. Whereas in an alkaline methanol/water solution, the reaction of Cu(ClO₄)₂¡¤6H₂O and the ligand H₅ccdp gave a slightly different dinuclear copper compound, Na₃[Cu₂(ccdp)(¦Ì-CO₃)]¡¤5H₂O, Na₃[1]¡¤5H₂O. The reaction of Cu(ClO₄)₂¡¤6H₂O and the ligand H₅ccdp, in the presence of NaOH in water yielded a tetranuclear copper compound, Na₂[Cu₂(ccdp)(H₂O)(¦Ì-OH₂)]₂¡¤15H₂O, Na₂[2]¡¤15H₂O. The structures of the all three complexes were determined using single crystal X-ray diffraction analyses. Variable-temperature magnetic susceptibility studies on the powder samples of the complexes showed antiferromagnetic behavior. Electrochemical studies in aqueous solutions of these negatively charged complex ions showed fairly assessable oxidations.