The molecular structure and magnetic properties of the dimeric N,N′-ethylenebis(salicylamine)Fe(II)-μ-methoxo- N,N′-ethylene( o-hydroxylphenylglycine)salicylamine Fe(III): A complex with a μ-monodentate acetato bridge

Abstract

We have prepared and characterized a dimeric complex of the formula Fe 2L(OCH 3)L′·solvent where L = N,N′-ethylenebis(salicylamine) and L′ = N,N′-ethylene( o-hydroxylphenylglycine)salicylamine. Crystals of the methanol solvate were found to be orthorhombic, space group P2 nb, with a = 13.748 (5), b = 22.426(9), c = 11.762(6) Å and d calc = 1.41 g/cm 3. Least squares refinement of 966 reflections gave a final R factor of 0.066. The structure shows that the two iron atoms are coordinated to two different ligands and are bridged by a methoxide ion and a μ-monodentate acetate oxygen from the pendant arm of L′. The magnetic susceptibility was measured over the range 2–300 K and gave a spin coupling constant J = −8.3 cm −1. The significance of acetate bridges to the exchange coupling pathway is discussed.