Synthesis, crystal structure and properties of a macrocyclic dinuclear manganese(II) complex with functional o-methylenephenolic pendant arms

A dinuclear manganese macrocyclic complex with functional pendant arms, [Mn -2(II)HL2](ClO4), has been prepared by the cyclocondensation of sodium 2,6- diformyl-4-methylphenolate with N,N-bis(2-aminoethyl)-N-(2-hydroxybenzyl)am ine and subsequent transmetallation of Mn(II)(ClO4)(2). In the molecular st ructure of the complex, each pendant arm is bound to an adjacent manganese atom and both arms lie on the same side of the resulting tetra-imine macroc ycle. Each manganese(II) ion is in a distorted octahedral configuration. Th e variable-temperature magnetism and the cyclic voltammogram of the complex have also been investigated. In the catalytic study, this compound exhibit s a high activity for catalyzing disproportionation of H2O2 to O-2. (C) 200 1 Elsevier Science B.V. All rights reserved.