Hydrothermal synthesis, crystal structure, and magnetic property of copper(II) coordination networks with chessboard tunnels

A copper(II) coordination polymer, bis(isonicotinato)copper(II) dihydrate, was prepared using a hydro(solvo)thermal process and characterized by a sin gle-crystal X-ray diffraction method and elemental analysis. Crystal data: [Cu(II)(C6H4O2N)(2). 2H(2)O](n), monoclinic, Cc, Z = 4, a = 4.9967(5) Angst rom, b = 24.971(2) Angstrom, c = 11.110(1) Angstrom, beta = 98.86(1)degrees , V = 1368.5(2) Angstrom, R-1 = 0.023, and wR(2) = 0.058. The structure is a three-dimensional metal-organic coordination network containing diamond-s haped tunnels. Magnetic studies show that the magnetic susceptibility data in the temperature range 2.0-300 K can be fitted to a Curie-Weiss law with theta = -0.93K and C = 0.398 emu K/mol (s = 1/2, g = 2.06), which correspon ds to an effective magnetic moment (mu (eff)) per copper ion of 1.78 BM. Th e magnetism result indicates that there is no strong interaction between co pper centers within the network structure. (C) 2001 Academic Press.