Structure and magnetic properties of homobinuclear gadolinium(III) complex of isonicotinoyl hydrazone

The crystal structure of [Gd-2(mu-L()3)(H2O)(2)]. 1.5(NO3). 1.5 (OH). 5H(2)O (where L is anion of N,N'-Diisonicotinoyl-2-hydroxy-5-methyl-isophthaladehyde dihydrazone) has been determined by X-ray diffraction method. The complex crystallizes in the monoclinic system, space group P2(1)/c with a = 1.6654(3), b = 1.6904(3), c = 2.8039(8) nm, beta = 91.30(3)degrees, final R factor is 6.3%. The structrue consists of [Gd-2(mu-L)(3)(H2O)(2)](3+) cation, one and a half nitrate and 1.5 hydroxyl anions and five water molecules. Within dinuclear cation, Gd(III)-Gd(III) is bridged by oxygen and nitrogen atoms of the three ligands, resulting in Gd ... Gd distance of 0.36353(2) nm. Gd(III) exhibits a distorted 1333 stack coordination environment. Magnetic susceptibility measurements in the temperature range 300-4 K revealed the occurrence of weak antiferromagnetic exchange interaction between two Gd(III) ions with a J value of -0.22, and g of 1.93.