Supramolecular assembly of new heteropolymetalic molecules based on tetraiminodiphenolate macrocycle and hexacyanometallate anions: Magnetostructural and spectroscopic properties
摘要:
Herein we report on the synthesis, single crystal X-ray structure, spectroscopic and magnetic properties of [{Cu-2(tidf)(H2O)}(2)(mu-CN)(2)Fe(CN)(4)]center dot 6H(2)O (1), [Cu-2(tidf)(H2O)2][Ni(CN)(4)] (2) and [Cu-2(tidf)(H2O)(2)][Fe(CN)(5)NO]center dot H2O (3) (tidf = a Robson type macrocyclic ligand obtained on condensation of 2,6-diformyl-4-methylphenol and 1,3-diaminopropane). Complex (1) is pentanuclear; two paramagnetic dicopper(II) units are linked by a hexacyanoferrate(II) ion through two cyano-bridges. All compounds exhibit extensive, three-dimensional, supramolecular structures supported by classic hydrogen bonding between the coordinated aqua ligands, water molecules and cyano groups. Magnetism as a function of the temperature of complexes 1-3 is consistent with a strong antiferromagnetism with exchange parameters 2J estimated -783(29), -913(2), -905(1), respectively. (C) 2011 Elsevier Ltd. All rights reserved.