摘要:
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)(CH3COO)(3)(H2O)(2)].H2O (1) and [Cu-3(L2-4H)(H2O)(3)(CH3OH)](NO3)(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)(CH3CN)(2)(H2O)(2)](ClO4)(6).2H(2)O (5) has an unusual trinuclear structure involving an alkoxy-bridged dinuclear center and an essentially isolated mononuclear Mn(II) center. The Mn(11) ions are antiferromagnetically coupled within the dinuclear subunit. Structural and magnetic data are discussed. (C) 2003 Elsevier Science Ltd. All rights reserved.