Bis-benzimidazolyl diamide copper (II) complexes: Synthesis, crystal structure and oxidation of substituted amino phenols

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• 作者：Gauri Ahuja ; Pavan Mathur ; ^{pavanmat@yahoo.co.in}
• 关键词：Benzimidazole diamides ; Copper (II) complexes ; Substituted amino phenols ; Phenoxazinone synthase
• 刊名：Inorganic Chemistry Communications
• 出版年：2012
• 出版时间：March, 2012
• 年：2012
• 卷：17
• 期：Complete
• 页码：42-48
• 全文大小：1180 K

文摘

A new tetradentate ligand N,N?Bis (1-butyl-benzimidazol-2-yl-methyl)-hexane-1,6-dicarboxamide (b-GBSA) has been utilized to synthesize mononuclear copper (II) complexes with inner sphere anionic ligands like NO₃^{?/sup>, Br?/sup> and Cl?/sup>. Two of the complexes [Cu(L)NO₃]NO₃ (1) and [Cu(L)Br]Br (2) have been structurally characterized. The geometry of copper (II) in (1) is a distorted octahedral with NO₃?/sup> anion acting as a bidentate ligand, while for (2) the geometry is found to be a near square pyramidal. The complexes carry out the oxidation of substituted amino phenols in the presence of molecular oxygen. The oxidation gets blocked at the dihydrophenoxazinone stage for 2-amino-5-methyl phenol, and to o-quinone for 2-amino-4-tertiary butyl phenol, quite like the enzyme phenoxazinone synthase.}