Abstract
Four new μ-oxamido heterodinuclear complexes, [Cu(oxae)Cr(L)2]-(NO3)3, where oxae denotes the N,N′-bis(2-aminoethyl)oxamido dianion and L represents 4,7-diphenyl-l,10-phenanthroline (Ph2-phen), 5-chloro-1,10-phenanthroline (Cl-phen), 2,9-dimethyl-l,10-phenanthroline (Me2-phen) and 4,4′-dimethyl-2,2′-bipyridine (Me2-bpy), have been synthesized and characterized by elemental analyses, magnetic moments (at room temperature) and molar conductivity measurements, and by spectroscopy (IR and electronic spectra). It is proposed that these complexes have extended oxamido-bridged structures consisting of planar copper(II) and octahedral chromium(III) ions. The cryomagnetic properties of [Cu(oxae)Cr(Me2-bpy)2](NO3)3(l) and [Cu(oxae)Cr(Me2-phen)2](NO3)3 (2) have been measured over the range 4.2-300 K. From least-squares fit of the experimental data, based on the spin Hamiltonian, Ĥ = -2JŜ1 Ŝ2, the exchange integrals (J) were evaluated as +19.8 cm−1 for(l) and +21.5 cm−1for (2). The results have confirmed that the spin coupling between the adjacent copper(II) and chromium(III) ions through the oxamido-bridge in both complexes (1) and (2) is ferromagnetic.
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