Trinuclear complexes of a series of ‘tritopic’ hydrazide ligands—structural and magnetic properties

Abstract

Copper(II) and manganese(II) complexes of some new symmetric and asymmetric tritopic hydrazide ligands based on 2,6-pyridine-dihydrazide (L1, L2) and iminodiacetic acid dihydrazide (L3) have been studied. The linear trinuclear complexes [Cu 3(L1-3H)(CH 3COO) 3(H 2O) 2]·H 2O ( 1) and [Cu 3(L2-4H)(H 2O) 3(CH 3OH)](NO 3) 2 ( 3) have three copper(II) centers bridged by trans-NN diazine linkages and exhibit moderate antiferromagnetic exchange. The complex [Mn 3(L3) 2(CH 3CN) 2(H 2O) 2](ClO 4) 6·2H 2O ( 5) has an unusual trinuclear structure involving an alkoxy-bridged dinuclear center and an essentially isolated mononuclear Mn(II) center. The Mn(II) ions are antiferromagnetically coupled within the dinuclear subunit. Structural and magnetic data are discussed.