Synthesis and Characterization of a Dinuclear Manganese(III,III) Complex with Three Phenolate Ligands

✍ Scribed by Reiner Lomoth; Ping Huang; Jiutian Zheng; Licheng Sun; Leif Hammarström; Björn Åkermark; Stenbjörn Styring

• Publisher: John Wiley and Sons
• Year: 2002
• Tongue: English
• Weight: 182 KB
• Volume: 2002
• Category: Article
• ISSN: 1434-1948
• DOI: 10.1002/1099-0682(200211)2002:11<2965::aid-ejic2965>3.0.co;2-3

✦ Synopsis

A dinuclear manganese complex ([Mn 2 L(µ-OAc) 2 ]PF 6 ) has been synthesized, where L is the trianion of 2,6-bis{[(2-hydroxy-3,5-di-tert-butylbenzyl)(2-pyridylmethyl)amino]-methyl}-4-methylphenol, a ligand with three phenolate groups. The two pseudo-octahedrally coordinated Mn ions are bridged via the two bidentate acetate ligands and the 4methylphenolate group of the ligand. We have characterized the complex with electrochemistry, spectroelectrochemistry and EPR spectroscopy. Electrochemically the Mn 2 III,III complex undergoes two metal-centered quasi-reversible oneelectron reduction steps (E 1/2 = 0.04 and -0.32 V vs. SCE). Reduction to the Mn 2 II,III state results in transformation into [a]