Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2012-04-01

Journal: DYES AND PIGMENTS

Included Journals: EI、SCIE

Volume: 93

Issue: 1-3

Page Number: 1401-1407

ISSN: 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.