Bis-o-semiquinonato complexes of transition metals with 5,7-di-tert-butyl-2-(pyridine-2-yl)benzoxazole

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• 作者：Natalia A. Protasenko^a ; Andrey I. Poddel’ ; sky^a ; ^{aip@iomc.ras.ru} ; Artem S. Bogomyakov^b ; Nikolay V. Somov^c ; Gleb A. Abakumov^a ; Vladimir K. Cherkasov^a
• 关键词：Transition metals ; o-Semiquinone ; O-donor ligand ; N-donor ligand ; Magnetochemistry ; X-ray analysis
• 刊名：Polyhedron
• 出版年：2013
• 出版时间：25 January, 2013
• 年：2013
• 卷：49
• 期：1
• 页码：239-243
• 全文大小：380 K

文摘

New cobalt(II) (1), iron(II) (2) and manganese(II) (3) complexes of M(3,6-SQ)₂L type containing 3,6-di-tert-butyl-o-benzosemiquinonato ligands (3,6-SQ) and 5,7-di-tert-butyl-2-(pyridine-2-yl)benzoxazole (L) were synthesized and characterized in details. Magnetic susceptibility measurements and spectroscopic studies have shown that all complexes include metal(II) in the high-spin state and two radical-anionic o-semiquinonato ligands. The antiferromagnetic ligand-ligand coupling in cobalt(II) and iron(II) complexes takes place, while manganese(II) complex demonstrates metal-ligand antiferromagnetic interactions. Molecular structure of Co(3,6-SQ)₂L was determined by X-ray analysis. Cobalt(II) atom has a distorted trigonal prismatic environment.