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摘要
Five new Zn-II/Cd-II coordination polymers (CPs) based on a flexible bis(imidazole) ligand 9,10-bis((2-methyl-1H-imidazol-1-yl)methyl)anthracene (bmima) with three different aromatic carboxylic acid ligands have been synthesized under solvothermal conditions: {[Cd(bmima)(0.5)(atp)(H2O)]center dot DMF center dot 0.5H(2)O} (CP 1), {[Zn(bmima)(atp)]center dot DMF} (CP 2), {[Cd(bmima)(bpdc)]center dot 2DMF} (CP 3), and {[M(bmima)(0.5)(oda)]center dot DMF center dot H2O} (M = Zn for CP 4 and Cd for CP 5), (H(2)atp = 2-aminoterephthalic acid; H(2)bpdc = [1,1 & PRIME;-biphenyl]-4,4 '-dicarboxylic acid and H(2)oda = 4,4 '-oxydibenzoic acid). CP 1 displays a 3,4-connected TiSc topology 3D framework with vertex symbols of {4(2)center dot 6 center dot 10(2)center dot 12}{4(2)center dot 6}. CP 2 and CP 3 both feature 2D layer structures with a five-fold interpenetration framework for CP 3. CP 4 and CP 5 both show a 3D "pillar-layer " structure with pcu alpha-Po topology. The structural differences of the five CPs may be due to the diverse coordination modes of dicarboxylate ligands and the conformation of flexible N-donor ligands. Moreover, CP 1 and CP 3 are two good fluorescent sensors for the detection of Fe3+, Cr2O72- and TNP. The mechanism of the two sensors shows that the fluorescent sensing process toward Fe3+ and Cr2O72- is mainly attributed to the competitive absorption process, while both competitive absorption and the more efficient FRET mechanism for TNP, respectively, which indicates that CP 1 and CP 3 can serve as two fluorescence sensors to sensitively and selectively detect the presence of Fe3+ and Cr2O72- in water.
