Synthesis and magnetism of μ-isophthalato dinuclear lanthanide(Ⅲ) complexes

• 作 者: 孔祥鹤 焉翠蔚 李延团 廖代正
• 机 构: Department of Chemistry, Qufu Normal University, Qufu, Shandong 273165, China,Department of Biology,
• 出 处: Chinese Journal of Chemistry
• 发表日期: 1999年06期
• 关键词: complexes dinuclear lanthanide magnetism Hamiltonian giving bidentate bridged co

Seven new μ-isophthalato dinuclear lanthanide(Ⅲ) complexes, namely [Ln2(IPHTA)(Me2-phen)4-(ClO4)2](ClO4)2 (Ln = La, Nd, Sm, Eu, Gd, Ho, Er), where Me2-phen denotes 2,9-dimethyl-1, 10-phenanthroline (Me2-phen) , IPHTA represents isophthalate dianion, have been synthesized and characterized by elemental analyses, molar conductance measurements, IR, ESR and electronic spectra. The variable-temperature magnetic susceptibilities of [Gd2( IPHTA) (Mez-phen)4 (ClO4)2] (ClO4)2 complex were measured in the temperature range of 4-300 K and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H = - 2JS1 · S2, giving the exchange parameter J =- 0.19 cm-1 . This result is commensurate with a weak antiferromagnetic spin-exchange interaction between Gd(Ⅲ)-Gd(Ⅲ) ions within the complex.

Seven new μ-isophthalato dinuclear lanthanide (Ⅲ) complexes, namely [Ln2 (IPHTA) (Me2-phen) 4- (ClO4) 2] (ClO4) 2 (Ln = La, Nd, Sm, Eu, Gd, Ho, Er ), where Me2-phen 2,9-dimethyl-1, 10-phenanthroline (Me2-phen), has been synthesized and characterized by elemental analyzes, molar conductance measurements, IR, ESR and electronic spectra. variable-temperature magnetic susceptibilities of [Gd2 (IPHTA) (Mez-phen) 4 (ClO4) 2] (ClO4) 2 complex were measured in the temperature range of 4-300 K and the observed data were successfully simulated by the equation based on the spin Hamiltonian operator, H = - 2JS1 · S2, gives the exchange parameter J = - 0.19 cm-1. This result is commensurate with a weak antiferromagnetic spin- exchange interaction between Gd (III) -Gd (III) ions within the complex .