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Seven new μ-oxamido copper(Ⅱ)-lanthanide(Ⅲ)hetero-bitnetalic complexes described by the fonnula Cu(obbz)Ln-(Ph-phen)2NO3(Ln=La,Nd,Eu,Gd,Tb,Ho,Er),where obbz denotes the oxamidobis(benzoato)and Ph-phen represents 5-phenyl-1,10-phenanthroline,have been synthesized and characterized by the elemental analyses,spectro-scopic(IR,UV,ESR)studies,magnetic moments(at room temperature)and molar conductivity measurement.The temperature dependence of the magnetic susceptibility of Cu(obbz)Gd(Ph-phen)2NO3 complex has been measured over the range 4.2-300 K.The least-squares fit of the experimental susceptibilities based on the spin Hamiltonian operator,H=-2JS1 S2,yielded J=+1.28 cm-1,a weak ferromagnetic coupling.A plausible mechanism for a ferromagnetic coupling between Gd(Ⅲ)-Cu(Ⅱ)is discussed in terms of spin-polarization.
Seven new μ-oxamido copper (Ⅱ) -lanthanide (Ⅲ) hetero-bitnetalic complexes described by the fonnula Cu (obbz) Ln- (Ph-phen) 2NO3 (Ln = La, Nd, Eu, Gd, Tb, Ho, Er ) where obbz represents the oxamidobis (benzoato) and Ph-phen for 5-phenyl-1,10-phenanthroline, have been synthesized and characterized by the elemental analyzes, spectro-scopic (IR, UV, ESR) studies, at room temperature) and molar conductivity measurement. The temperature dependence of the magnetic susceptibility of Cu (obbz) Gd (Ph-phen) 2NO3 complex has been measured over the range 4.2-300 K. The least-squares fit of the experimental susceptibilities On the spin Hamiltonian operator, H = -2JS1 S2, and yielded J = + 1.28 cm-1, a weak ferromagnetic coupling. polarization.