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

Abstract

Self-assembly of CdI 2 with flexible unsymmetric ligands pybta and pyta [pybta = N-(3-pyridylmethyl)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) 4I 6] n ( 1) and [Cd(pyta) 2I 2] n ( 2). 1 crystallizes in the triclinic system, space group P-1, with cell parameters M = 1939.56, a = 8.5269(3) Å, b = 13.2387(2) Å, c = 13.9066(4) Å, α = 71.927(5)°, β = 83.180(7)°, γ = 81.002(7)°, V = 1469.90(7) Å 3, Z = 1, R 1[ I > 2 σ( I)] = 0.0361, w R 2 [ I > 2 σ( I)] = 0.0889. 2 crystallizes in the monoclinic system, space group P2 1/ c, with cell parameters M = 686.57, a = 8.1754(11) Å, b = 16.5254(14) Å, c = 8.9068(10) Å, β = 116.434(4)°, V = 1077.5(2) Å 3, Z = 2, R 1[ I > 2 σ( I)] = 0.0214, w R 2 [ I > 2 σ( I)] = 0.0483. Complex 1 displays a 1D double-stranded chain structure consisting of tri-nuclear [Cd 3(pybta) 2I 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.