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

TL;DRAbstract

A unique metal-organic framework [Cd2(L)1.5(μ3-OH)(H2O)2]·2H2O(1, H2L = 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 Pī, C33H27CdO14, Mr = 870.33, α = 12.2939(17), b = 12.5135(9), c = 13.2046(10) Å, α= 115.3190(10), β96.9140(10), γ = 109.7950(10)°, V = 1641.6(3) Å3, Z = 2, Dc = 1.761 g/cm3, F(000) = 862, μ(MoKa) = 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.

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