Abstract
Two novel complexes based on an unsymmetrical tetracarboxylate, namely, [Cd2(bptc)(bpp)(H2O)2]n·nH2O (1, H4bptc = 2,3,3′,4′-biphenyl tetracarboxylic acid; bpp = 1,3-bis(4-pyridyl) propane), [Cu(H2bptc)(phen)] (2, phen = 1,10-phenanthroline) have been solvothermally synthesized with the aid of N-donor ligands. The structures, CHN analysis, IR analysis, thermal stabilities and photoluminescence properties of title complexes were investigated. Single-crystal X-ray diffraction analysis indicates that complex 1 demonstrates a novel 3-D network with (4, 5, 5) -connected (3ˑ4ˑ5ˑ6ˑ82) (3ˑ42ˑ5ˑ63ˑ83) (3ˑ43ˑ52ˑ63ˑ7) topology. Whereas complex 2 only possesses a mononuclear structure. Photoluminescence studies indicate that complex 1 shows a strong green light emission, while 2 exhibits blue emissions. Moreover, the luminescence properties of 2 can be utilized to sensitively and selectively detect acetylacetone in aqueous solution with the detection limit of 61.3 ppb. In addition, the probable mechanisms are also detailedly investigated, which indicate that the static photo-competitive absorption, photoinduced electron transfer and H-bonding interaction between sensor and analyte may be the main reasons for the fluorescence quenching effect.
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