Chemical Control of Valence Tautomerism of Nickel(<scp>II</scp>) Semiquinone and Nickel(<scp>III</scp>) Catecholate States

Abstract

Fine-tuning the N-donor ability of a bidentate aminopyridyl ligand facilitated the selective synthesis of complexes 1 (no methyl substituent) and 2 (with a methyl substituent) which possess valence tautomeric nickel(II) semiquinonato and nickel(III) catecholato frameworks, respectively.