STRUCTURE AND MAGNETIC-PROPERTIES OF A NOVEL CHLORO-BRIDGED POLYMERICCADMIUM(II) COMPLEX WITH PYRIDYL-SUBSTITUTED NITRONYL NITROXIDE

A complex of etramethyl-4,5-dihydro-1H-imidazol-1-oxy-3-N-oxide (NIToP y) with Cd(II)Cl-2, [(CdCl2)(3)-(NIToPy)(2)(C2H5)(2)], has been struct urally 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 altern ating between one CdCl4O2 and two CdCl4NO octahedral coordination unit s. The temperature-dependence of the magnetic susceptibility reveals t he 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 NI ToPy radicals. (C) 1998 Elsevier Science S.A. All rights reserved.