Synthesis and Magnetic Properties of Binuclear Lanthanide(III) Complexes Bridged by mi-2-Chloroterephthalato Groups

• Autorzy: Li Y.
• Języki publikacji: EN

Abstrakty

EN

Ten new binuclear lanthanide(III) complexes described by the overall formula [Ln2(CTPHA)(Mephen)4(ClO4)2](ClO4)2 (Ln = La, Ce, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er), where Mephen stands for 5-methyl-1,10-phenanthroline, and CTPHA represents the 2-chloroterephthalate dianions, have been synthesized and characterized by elemental analyses, molar conductance measurements, IR, ESR and electronic spectra. It is proposed that these complexes present CTPHA-bridged structures consisting of two lanthanide( III) ions. The [Gd2(CTPHA)(Mephen)4(ClO4)2](ClO4)2 complex has been further characterized by variable-temperature magnetic susceptibilities (4~300 K), demonstrating a very weak antiferromagnetic spin-exchange interaction between Gd(III)-Gd(III) ions within the complex. Based on the spin Hamiltonian operator, _ _ _ H = 2JS S 1 2 _ _ , the exchange parameter (J) was evaluated as -0.16 cm-1.

Słowa kluczowe

EN

mi-2-chloroterephthalato-bridge; binuclear lanthanide(III) complexes; magnetism; synthesis

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2001
• Tom: Vol. 75, nr 9
• Strony: 1195--1202

Twórcy

autor

Li Y.

• Department of Chemistry, Qufu Normal University, Qufu Shandong, 273165, P. R. China