Metal coordination architectures of N-propionyl-1-hydroxy-2-naphthoylhydrazide: From metalladiazamacrocycles to trinuclear complexes

Two metalladiazamacrocycles, 24-membered octanuclear [Mn-8(pnhz)(8)(DMF)(5)(MeOH)(3)]DMF 3.5MeOH (1) and 18-membered hexanuclear [Fe-6(pnhz)(6)(DMF)(6)] (2), and two linear trinuclear complexes, [Cu-3(pnhz)(2)(Py)(6)] 2Py (3) and [Ni-3(pnhz)(2)(Py)(4)] (4), have been synthesized based on a trianionic pentadentate bridging ligand N-propionyl-1-hydroxy-2-naphthoylhydrazide (H(3)pnhz). The complexes are characterized by elemental analysis, IR, UV-vis spectroscopy and single-crystal X-ray diffraction. The nature of metal ions and steric effect of N-propionyl-1-hydroxy-2-naphthoylhydrazide ligand play key roles in the formation of complexes with different nuclearity. Complexes 1,2 and 3 exhibit antiferromagnetic coupling interactions between the metal centers. (C) 2010 Elsevier Inc. All rights reserved.