FERROMAGNETIC AND ANTIFERROMAGNETIC PROPERTIES OF METAL-COMPLEXES WITH PYRIDINE-SUBSTITUTED NITRONYL NITROXIDE RADICALS

The synthesis, crystal structure and magnetic properties of the non-tr ansition metals; Cd(II), Zn(II), Hg(II), Mg(II) and the transition met als; Co(II), NI(II), Cu(II) complexes with dyl)-4,4,5,5-tetramethylimi dazolinyl-1-oxy-3-oxide (NITpPy) are presented. The compounds of free radical NITpPy, HgCl2(NITpPy), and Zn(acac)(2)(NITpPy) crystallize in the same monoclinic system of space group C2/c. The magnetic propertie s of the temperature-dependent magnetic susceptibility of NITpPy and i ts metal complexes are discussed according to the Heisenberg model. A weak ferromagnetic coupling in NITpPy and a weak antiferromagnetic cou pling in the metal complexes have been revealed.