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Indexed by:期刊论文

Date of Publication:2005-07-11

Journal:TETRAHEDRON LETTERS

Included Journals:SCIE、Scopus

Volume:46

Issue:28

Page Number:4817-4820

ISSN No.:0040-4039

Key Words:heptamethine cyanine dyes; fluorescence sensors; near-infrared; photoinduced electron transfer

Abstract:An efficient photoinduced electron transfer (PET) system in near-infrared region was described. The PET in heptamethine cyanine dyes was tuned by changing the electron-donating ability of the substituent at the central position of the polymehine chain. 4-Aminophenylthio-substitution led to an efficient PET and the lowest fluorescence quantum yield. The acetylation, protonation or transition metal cation coordination of the amino group could recover fluorescence greatly via suppressing the PET. (c) 2005 Elsevier Ltd. All rights reserved.