Add time:07/11/2019         Source:sciencedirect.com

ABSTRACTEfficiently and selectively detecting definite organic compound is attractive but challenging. In this study, we report two novel cucurbit[6]uril (Q[6]) - based supramolecular assemblies {(NH4)2[Zn(H2O)6][Mg(TPTCA)(H2O)2]4(Q[6])6}·66H2O (1) and {[Zn(PBPCA)(H2O)2]Q[6]}·21H2O (2) [H3TPTCA = [1,1’:3’,1”-terphenyl]-4,4”,5’-tricarboxylic acid and H2PBPCA = pyridine-3,5-bis(phenyl-4-carboxylic acid)] by using metal complexes with multiaromatic carboxylate ligands as structure-directing agent. The formation of these assemblies is ascribed to the non-covalent π···π, C-H···π, hydrogen bonding interactions between the outer-surface of Q[6] and coordination complexes. More impressively, 1 and 2 exhibit enhanced fluorescence compared with the ligands and can serve as chemical sensors for aromatic amines and nitroaromatic compounds, particularly for 2,4,6-trinitrophenol (TNP), via fluorescence quenching effect with high selectivity and sensitivity.

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