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1 2001

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Synthesis, Characterizationand Ferromagnetic Spin-Coupling Between Chromium(III) and Copper(II) Ions in Oxamido Bridget Cu(II)-Cr(III) Dinuclear Complexes

Li Y., Yan C. W., Hu C. X.

Polish Journal of Chemistry

2001

Vol. 75, nr 3

329-336

Four new heterodinuclear copper(II)-chromium(III) complexes bridged by dianions of N,N -oxamidobis(propionato)cuprate [Cu(obp)] and end-capped with 1,10-phenanthroline (phen), 5-nitro-1,10-phenanthroline (NO2-phen), 5-chloro-1,10-phenanthroline (Cl-phen) or 5-bromo-1,10-phenanthroline (Br-phen); namely [Cu(obp)Cr(L)2]NO3 (L = phen, NO2-phen, Cl-phen, Br-phen), have been synthesized and characterized by elemental analyses, IR and electronic spectra studies, magnetic moments at room-temperature and molar conductivity measurements. It is proposed that these complexes have extended oxamido-bridged structures consisting of a copper(II) ion and a chromium(III) ion, which have a square-planar environment and an octahedral environment, respectively. The magnetic susceptibility of [Cu(obp)Cr(phen)2]NO3 complex was measured between 4.2 300 K and the magnetic analysis was studied in detail, demonstrating the operation of a ferromagnetic interaction between the adjacent chromium(III) and copper( II) ions through the oxamido-bridge within the complex. Based on spin Hamiltonian, H= - 2JS S 1 . S 2, the exchange integral (J) was evaluated as 12.8 cm -1.