Structure and magnetic properties of a novel chloro-bridged polymeric cadmium(II) complex with pyridyl-substituted nitronyl nitroxide

摘要

A complex of 2(2-pyridyl)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxy-3-N-oxide (NIToPy) with Cd(II)Cl-2, [(CdCl2)(3)-(NIToPy)(2)(C2H5)(2)], has been structurally and cryomagnetically characterized. The structure is based on a layered zigzagging polymeric chain along the (101) plane; the Cd(II) ions are linked into infinite chains by double chlorine bridges alternating between one CdCl4O2 and two CdCl4NO octahedral coordination units. The temperature-dependence of the magnetic susceptibility reveals the presence of a Heisenberg antiferromagnetic exchange interaction of a two spin S = 1/2 system, with J = - 0.25 cm(-1) associated with the intermolecular interaction between the NO groups of two neighboring NIToPy radicals. (C) 1998 Elsevier Science S.A. All rights reserved. [References: 18]