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1 Polish Journal of Chemistry

1 2000

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Synthesis, Characterization and Magnetism of Chloranilato-Bridged Chromium(III)-Chromium(III) Binuclear Complexes

Li Y., Yan C., Zeng X.

Polish Journal of Chemistry

2000

Vol. 74, nr 3

377-383

Four new chlorantilato-bridged chromium (III)-chromium(III) binuclear complexes of the formula [Cr2(CA)L4](SO4)2[L denotes 2,2-bipyridine (bpy); 1,10-phenanthroline (phen); 5-nitro-1,10-phenanthroline (NO2-phen) and 5-bromo-1,10-phenanthroline (Br-phen), respectively], were CA represents the dianion of chloranilic acid, have been synthesized and characterized. Based on elemental analyses, molar conductivity and magnetic moment of room-temperature measurements and spectroscopic studies, it is proposed that these complexes have CA-bridged structures and consist of two chromium(III) ions, each in a distorted octahedral enviroment. The complexes [Cr2(CA)(phen)4](SO4)2 (1) and [Cr2(CA)(bpy)4](S)4)2 (2) were further characterized by variable temperature (4-300 K) magnetic susceptibility measurements and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H= @JS1 * S2, giving the exchange parameter J=-8,9 cm-1 for (1) and J=-6,6 cm -1 for (2). This result indicates that there is a weak antiferromagnetic spin-exchange interaction between the two chromium(III) ions within each molecule.