Effect of Anionic Ancillary Ligands on Terpyridine Based Coordination Polymers:Synthesis, Crystal Structure and Fluorescence Property

摘要

By using different anionic ancillary ligands, two new coordination polymers, [Cd(L)I_2]_n(1) and {[Cd(L)_2(1,4-bdc)]·H_2O}_n(2)(L = 2,4,6-tris(4-pyridyl)pyridine, 1,4-H_2bdc = benzene-1,4-dicarboxylic acid), have been synthesized under hydrothermal conditions. Compound 1 crystallizes in monoclinic, space group C2/c with a = 11.625(2), b = 13.871(3), c = 13.676(3) ?, β = 108.11(3)°, V = 2096.0(7) ?~3, D_c = 2.144 g/cm^3, C_(20)H_(14)I_2N_4Cd, M_r = 676.55, F(000) = 1264, μ(MoKα) = 3.999 mm^(–1), Z = 4, Rint = 0.0308,(Δρ)_(max) = 0.354,(Δρ)_(min) = 0.289, R = 0.0332 and wR = 0.0721 for 2401 observed reflections(I > 2σ(I)). However, compound 2 crystallizes in triclinic, space group P1 with a = 10.315(2), b = 14.060(3), c = 15.090(3) ?, β = 98.40(3)o, V = 1990.0(9) ?~3, D_c = 1.527 g/cm^3, C_(48)H_(34)N_8O_5Cd, M_r = 915.23, F(000) = 932, μ(MoKα)= 0.610 mm^(–1), Z = 2, Rint = 0.0776,(Δρ)_(max) = 0.869,(Δρ)_(min) = 0.843, R = 0.0815 and wR = 0.1930 for 6999 observed reflections(I > 2σ(I)). Compound 1 is a 1D chain structure, which adopts inorganic anion I- as the counterion, and 2 exists a 2D(4,4) network constructed by benzene-1,4-dicarboxylic acid.