| Abstract: | 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) (Me2-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. J2. 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) im within the complex. |
