Abstract
A class of bis-crown ether fluorescent chemosensors for detection of trace amounts of Na+, K+, and Cs+ and Pb2+ was investigated. A distyrylbenzene derivative with crown ether rings of varying size attached to each benzene (12-crown-4 (1), 15-crown-5 (2), and 18-crown-6 (3)) can form intermolecular sandwich structures with Na+, K+, and Cs+ ions, respectively. In addition, bis-crown 2 forms unique sandwich complexes with Pb2+; the stoichiometry depends on the counterion present. Crystal structure data for the complex of Pb(CF3COO)2 with 2 indicate a unique sandwich structure having dilead tetrakis(trifluoroacetate) bridging two crowns on separate ligands. The bis-crown/alkali metal ion complexes have 1:1 stoichiometry in each case. 1H NMR spectra and MALDI-TOF mass spectra clearly demonstrate that formation of the self-assembled sandwich structure is associated with the fluorescence enhancement for sensor molecules 2 and 3 with K+ and Cs+, respectively. Sensor molecule 1, however, has an additional fluores...
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