Tricarboxy Ligand Cu-II Metal-organic Framework with Magnetic and Proton Conduction Properties

Hydrothermal reaction of Cu(NO3)(2)center dot 3H(2)O and 4-(4-carboxyphenoxy)isophthalic acid (H(3)cpia) results in a two-dimensional coordination polymer based on paddle-wheel-like dinuclear clusters, namely [C60H54Cu4O39](n) (1). Complex 1 is of triclinic system, space group P (1) over bar with a = 10.7318(18), b = 12.267(2), c = 14.528(2) angstrom, alpha = 113.560(2)degrees , beta = 96.156(3)degrees, gamma = 103.552(3)degrees , V = 1660.5(5) angstrom(3), Z = 1, S = 1.057, F(000) = 842, R = 0.0517 and wR = 0.1426 (I > 2 sigma(I)). In this structure, tricarboxylate liagnds are partial deprotonation and potenial proton carriers. Strong antiferromagnetic interaction between Cu-II ions exists within the Cu(2 )cluster and complex 1 exhibits relatively high proton conductivity (sigma > 1.23 x 10(-3) S.cm(-1)) at 76% relative humidity (RH).