A Novel Layer Cadmium Coordination Polymer Containing Tetranuclear Cd4(tpt)2(Cl)44+ as a Secondary Building Unit (SBU) Bridged by Pyridine 2,4-Dicarboxylic Acid

摘要

A novel 2-D {[Cd4(tpt)2(Cl)4(2,4-pdc)2]·4H2O}n(1) has been synthesized from the hydrothermal reaction of 3,5,6-tris(2-pyridyl)-1,3,5-triazine(tpt), hydrated CdCl2, and 2,4-dicarboxylic acid(2,4-H2pdc). Compound 1 crystallizes in triclinic, P1 space group with α = 8.9434(5), b = 9.5486(7), c = 17.5772(8) , a = 75.014(5), β = 83.778(5), γ = 68.304(6)°, V = 1347.14(14) 3, C50H38Cd4Cl4N14O12, Mr = 1618.32, Dc = 1.990 g/cm3, S = 0.95, μ(MoKα) = 1.83 mm-1, F(000) = 788, Z = 1, R = 0.039 and wR = 0.080. The structure consists of tetranuclear [Cd4(tpt)2(Cl)4]4+ cores as the secondary building unit, which is further connected by the ligand pdc2- to give a 2-D extended structure. Tpt entities are located on both sides of each 2-D framework and act as ‘side arms' to form a corrugated layer and the adjacent layers are arranged in a tongue-and-groove interdigitating fashion. 1 was characterized by IR, TGA, PX1RD, and elemental analysis. The solid state luminescent properties were also investigated at room temperature.