NDLI: An AIE-active hemicyanine fluorogen with stimuli-responsive red/blue emission: extending the pH sensing range by “switch + knob” effect

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Chemical Science Vol - 3 Issue - 5

Chemical Science Vol - 3 Issue - 4

Chemical Science Vol - 3 Issue - 3

Chemical Science Vol - 3 Issue - 2

Chemical Science Vol -2

Chemical Science Vol -1

An AIE-active hemicyanine fluorogen with stimuli-responsive red/blue emission: extending the pH sensing range by “switch + knob” effect

Content Provider	Royal Society of Chemistry (RSC)
Author	Hong, Yuning Jim, Cathy K. W. Lam, Jacky W. Y. Wong, Kam Sing Liu, Yang Zhao, Na Chen, Sijie Liu, Jianzhao Su, Huimin Kwok, Ryan T. K. Qin, Wei Tang, Ben Zhong
Copyright Year	2012
Abstract	In this work, a red-emissive zwitterionic hemicyanine dye, named TPE–Cy, containing tetraphenylethene (TPE) and N-alkylated indolium is designed and synthesized. TPE–Cy inherits the aggregation-induced emission (AIE) feature of TPE and displays a large Stokes shift (>185 nm), overcoming the limitations of the concentration-quenching effect and small Stokes shift (from a few to 20 nm) encountered by conventional cyanine dyes. By taking advantage of the photophysical AIE property and chemical reactivity towards OH−/H+, TPE–Cy is able to sense pH in a broad range (the broadest to date) by showing different emission colors and intensities: strong to moderate red emission at pH 5–7, weak to no emission at pH 7–10, and no emission to strong blue emission at pH 10–14. The acid/base-switched red/blue emission transition is reversible and can be repeated for many cycles. By means of NMR and HRMS analyses, we have drawn a mechanistic picture at molecular level to illustrate how this dye works as a pH-sensitive fluorescent probe.
Starting Page	1804
Ending Page	1809
Page Count	6
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	3
Issue Number	6
Journal	Chemical Science
DOI	10.1039/c2sc01108e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	HRMS Dye Stokes shift Stokes Hydrogen PH Cyanine AIE
Content Type	Text
Resource Type	Article
Subject	Chemistry

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