Crystal structure and magnetic properties of a heteronuclear, gadolinium-zinc carboxylate complex

A novel heteronuclear complex, [Gd2Zn2L10(bipy)(H2O)(2)](2) (HL = alpha-methylacrylic acid, bipy = 4,4'-bipyridine), was synthesized and characterized. its structure, determined by X-ray diffraction, reveals a discrete octa-nuclear molecule. in which two Zn-II ions are linked by a bipy Molecule and G(III) ions, and Gd-III and Zn-II ions are bridged by bidentate alpha-methylacrylato groups. The complex crystallizes in space group P1 with Z = 1. a = 13.4504(6), b = 14.9697(5), c = 16.4374(5) Angstrom, alpha = 64.212(3), beta = 89.727(2), gamma = 86.241(1)degrees. The structure was refined to R = 0.0303 for 8925 observed reflections. The temperature dependence of the magnetic susceptibility of the complex shows that a weak intramolecular ferromagnetic interaction exists as well as all intermolecular anti ferromagnetic interaction.