A novel metal-organic framework [Cd_3(CPEIP)_2(DMF) _3]·solvent (1) based on a neutral non-oxo triangular [Cd _3(COO)_6] secondary building unit (SBU), was synthesized under solvothermal conditions by using a rigid unsymmetrical tricarboxylate ligand 5-((4-carboxyphenyl)ethynyl)isophthalic acid (H_3CPEIP). Single-crystal X-ray diffraction analysis reveals that compound 1 crystallizes in the monoclinic space group C2/c. The crystal structure exhibits a rare (3,3,6)-connected three-dimensional (3-D) framework with vertex symbol of (4~2.6)(4~3)(4~5.6~4.8~6). The incorporation of CPEIP~(3+) into 1 gives rise to high luminescence in solid state. The emission of micrometer-sized compound 1 (1′) dispersed in ethanol could be quenched efficiently by picric acid (PA), indicating that this compound could be utilized as a chemosensor for detection of aromatic explosives.
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