Synthesis, crystallographic characterization and catecholase activity of a monocopper(II) and a dimanganese(III) complex with an anionic Schiff base ligand

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• 作者：Merry Mitra ; Ashis Kumar Maji ; Barindra Kumar Ghosh ; Gurpreet Kaur ; Anghsuman Roy Choudhury ; Chia-Her Lin ; Joan Ribas ; Rajarshi Ghosh
• 关键词：Copper(II)/manganese(III) ; Schiff base ; Crystal structure ; Magnetism ; Catalytic activity
• 刊名：Polyhedron
• 出版年：2013
• 出版时间：18 September, 2013
• 年：2013
• 卷：61
• 期：Complete
• 页码：15-19
• 全文大小：770 K

文摘

The mononuclear [Cu^II(HL)₂] (1) and dinuclear [Mn^III₂(¦Ì_1,3-OAc)₂L₂] (2) [H₂L = N-(2-hydroxypropyl)-3-methoxysalicylaldimine] compounds have been synthesized and characterized using microanalytical, spectroscopic and X-ray crystallographic results. Structural analysis reveals a bidentate chelation behavior of the monoanionic HL ligand, having a distorted square planar coordination environment around copper(II) with a CuN₂O₂ chromophore. In compound 2, each manganese(III) center has a distorted octahedral geometry, with an MnN₂O₄ chromophore bridged by two acetate ligands in a ¦Ì_1,3 fashion. Variable-temperature magnetic susceptibility measurements of 2 indicate an antiferromagnetic interaction between the two manganese(III) centers. Both 1 and 2 behave as effective catalysts towards the oxidation of 3,5-di-tert-butylcatechol to its corresponding quinone with molecular oxygen in methanolic solution.