Mononuclear Mn(III) and dinuclear Mn(III, III) Schiff base complexes: Influence of 蟺-蟺 stacking on magnetic properties

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• 作者：Manas Sutradhar ; Luca M. Carrella ; Eva Rentschler ; ^{rentschl@uni-mainz.de}
• 关键词：Dinuclear Mn(III ;   ; III) ; N2O2 donor ; 蟺&ndash ; 蟺 Stacking ; Structures ; Antiferromagnetic exchange interaction
• 刊名：Polyhedron
• 出版年：2012
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：11 May, 2012
• 卷：38
• 期：1
• 页码：297-303
• 文件大小：778 K

摘要

Synthesis of a mononuclear Mn(III) (1) and a dinuclear Mn(III, III) (2) complex of a tetradentate N₂O₂ donor Schiff base ligand with ancillary carboxylate ligands are reported. Complex 1 crystallizes in the monoclinic space group C2/c, complex 2 in the triclinic space group P-1. In both complexes the central Mn(III) ions are hexacoordinated having a distorted octahedral MnN₂O₄ coordination environment. Intermolecular hydrogen bonding and strong 蟺-蟺 stacking in both 1 and 2 leads to dimerization of 1 and formation of a syn-anti one-dimensional chain for 2. Magnetic properties of 1 and 2 are reported. Both complexes show very weak intermolecular antiferromagnetic interaction. Most interestingly the major contribution for the exchange coupling arises from a superexchange pathway involving 蟺-蟺 interaction.