Synthesis and characterization of two infinite coordination networks from flexible unsymmetric ligands

Self-assembly of CdI2 with flexible unsymmetric ligands pybta and pyta [pybta = N-(3-pyridylmetliyl)benzotriazole, pyta = 1-(4-pyridylmethyl)(1,2,4-triazole)], respectively, by layer-separating diffusion method at ambient temperature gives rise to two new supramolecular architectures [Cd-3(pybta)(4)I-6](n) (1) and [Cd(pyta)(2)I-2](n) (2). 1 crystallizes in the triclinic system, space group P-1, with cell parameters M = 1939.56, a = 8.5269(3) angstrom, b = 13.2387(2) angstrom, c = 13.9066(4) angstrom, alpha = 71.927(5)degrees, beta = 83.180(7)degrees, gamma = 81.002(7)degrees, V= 1469.90(7) angstrom(3), Z = 1, R-1[I > 2 sigma(I)] = 0.0361, wR(2) [I > 2 sigma(I)] = 0.0889.2 crystallizes in the monoclinic system, space group P2(1)/c, with cell parameters M = 686.57, a = 8.1754(11) angstrom, b = 16.5254(14) angstrom, c = 8.9068(10) angstrom, beta = 116.434(4)degrees, V = 1077.5(2) angstrom(3), Z = 2, R-1[I > 2 sigma(1)] = 0.0214, wR(2) [I > 2 sigma(I)] = 0.0483. Complex 1 displays a 1 D double-stranded chain structure consisting of tri-nuclear [Cd-3(pybta)(2)I-6] subunits, as well as complex 2 exhibits an usual 2D 4(4) sheet structure. The thermal property associated with their crystal structures has also been measured. (C) 2007 Elsevier B.V. All rights reserved.