Synthesis and Magnetic Properties of Heterobinuclear Copper(II)–Lanthanide(III) Complexes with N,N -Oxamidobis(benzoato)cuprate(II) as Ligand
نویسنده
چکیده
Six new copper(II)–lanthanide(III) heterobinuclear complexes, described by the formula Cu(obbz)Ln(Me2-phen)2NO3 (Ln = La, Nd, Gd, Tb, Ho, Er), where obbz denotes the oxamidobis(benzoato) and Me2-phen represents 2,9-dimethyl-1,10-phenanthroline (Me2-phen), have been synthesized and characterized by the elemental analyses, spectroscopic (IR, UV, ESR) studies, magnetic moments (at room temperature) and molar conductivity measurements. The temperature dependence of the magnetic susceptibility of Cu(obbz)Gd(Me2-phen)2NO3 complex has been measured between 4.2~300 K. The least-squares fit of the experimental susceptibilities, based on the spin Hamiltonian operator, H = –2J S1 S2, yielded J = +2.85 cm . The Gd(III)–Cu(II) coupling is ferromagnetic. A plausible mechanism for a ferromagnetic coupling between Gd(III)–Cu(II) is discussed in terms of spin-polarization.
منابع مشابه
Synthesis and Characterization of Some Lanthanide(III) Chloro Complexes Derived from 4[N-(4’-Hydroxy-3’-Methoxybenzalidene) Amino] Antipyrine Semicarbazone and 4[N-(3’,4’,5’-Trimethoxybenzalidene) Amino]Antipyrine Semicarbazone
Lanthanide(III) chloro complexes of 4[N-(4’-hydroxy-3’-methoxybenzalidene) amino] antipyrine semicarbazone (HMBAAPS) (I) and 4[N-(3’,4’,5’-trimethoxybenzalidene) amino] antipyrine semicarbazone (TMBAAPS) (II) with the general composition LnCl3.2L (Ln = La, Pr, Nd, Sm, Gd, Tb, Dy or Ho; L = HMBAAPS or TMBAAPS) are reported. All the complexes were synthesized in ethanolic medium and refluxed the ...
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