A New 3D Metal-organic Framework with Tetranuclear Cadmium(II) Clusters: Synthesis, Structure, and Luminescent Property

A unique metal-organic framework [Cd2(L)1.5(μ3-OH)(H2 O)2 ]·2H2 O(1, H2 L = 2,5-dibenzoylterephthalic acid) has been synthesized under hydrothermal conditions, and characterized by single-crystal X-ray diffractions, elemental analyses, IR spectra and fluorescence spectrum. The compound is of triclinic system, space group P1, C33 H27 CdO14, Mr = 870.33, a = 12.2939(17), b = 12.5135(9), c = 13.2046(10), α = 115.3190(10), β = 96.9140(10), γ = 109.7950(10)°, V = 1641.6(3)3, Z = 2, Dc = 1.761 g/cm3, F(000) = 862, μ(MoK) = 1.366 mm-1, Rint = 0.0148, R = 0.0240 and wR = 0.0639 for 5995 observed reflections with I > 2σ(I). X-ray analysis shows that the title complex exhibits a 3D framework with(412·63) topology, in which the tetra-nuclear [Cd4(μ3-OH)2 ] clusters act as 6-connected nodes, and the L ligands can be simplified to be linear connectors. Moreover, the thermal stability and fluorescence have been studied in detail.