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Indexed by:期刊论文

Date of Publication:2012-04-01

Journal:DYES AND PIGMENTS

Included Journals:SCIE、EI

Volume:93

Issue:1-3

Page Number:1401-1407

ISSN No.:0143-7208

Key Words:Hemicyanine; Fluorescence enhancement; TICT; Cucurbit[6]uril; Supramolecular chemistry; Logic gate

Abstract:About 270 times fluorescence enhancement was observed when the hemicyanine dye, trans-4-[4-(dimethylamino)styryl]-1-methylpyridinium iodide (DSMI), was included by cucurbit[61uril (CB[6]). The 1:1 stoichiometry of DSMI/CB[6] complex was determined through optical spectra and H-1 NMR measurement. The large fluorescence enhancement was achieved by prohibiting the twisted intramolecular charge transfer (TICT) process of DSMI inside the distorted cavity of CB[6], together with the ion-dipole interaction between DSMI and CB[6]. The distortion of the CB[6] cavity, being as the major reason for the great fluorescence enhancement, was further confirmed in the calculation results. A resettable and reconfigurable logic gate was also constructed with DSMI and CB[6] under different pH situations. This study lays a solid foundation for the design of molecular logic gates by a supramolecular interaction mode. 2011 Elsevier Ltd. All rights reserved.