NDLI: AIEgens for dark through-bond energy transfer: design, synthesis, theoretical study and application in ratiometric Hg<sup>2+</sup> sensing

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhang, Weijie Chen, Yuncong Zheng, Xiaoyan Lam, Jacky W. Y. Kwok, Ryan T. K. Chen, Bin Gui, Chen Gu, Xinggui Hu, Yubing He, Zikai Cai, Yuanjing Zhao, Zheng Tang, Ben Zhong
Copyright Year	2017
Abstract	A novel dark through-bond energy transfer (DTBET) strategy is proposed and applied as the design strategy to develop ratiometric Hg2+ sensors with high performance. Tetraphenylethene (TPE) derivatives with aggregation-induced emission (AIE) characteristics are selected as dark donors to eliminate emission leakage from the donors. The TBET mechanism has been adopted since it experiences less influence from spectral overlapping than Förster resonance energy transfer (FRET), making it more flexible for developing cassettes with large pseudo-Stokes shifts. In this work, energy transfer from the TPE derivatives (dark donor) to a rhodamine moiety (acceptor) was illustrated through photophysical spectroscopic studies and the energy transfer efficiency (ETE) was found to be up to 99%. In the solution state, no emission from the donors was observed and large pseudo-Stokes shifts were achieved (>280 nm), which are beneficial for biological imaging. Theoretical calculations were performed to gain a deeper mechanistic insight into the DTBET process and the structure–property relationship of the DTBET cassettes. Ratiometric Hg2+ sensors were rationally constructed based on the DTBET mechanism by taking advantage of the intense emission of TPE aggregates. The Hg2+ sensors exhibited well resolved emission peaks. >6000-fold ratiometric fluorescent enhancement is also achieved and the detection limit was found to be as low as 0.3 ppb. This newly proposed DTBET mechanism could be used to develop novel ratiometric sensors for various analytes and AIEgens with DTBET characteristics will have great potential in various areas including light harvesting materials, environmental science, chemical sensing, biological imaging and diagnostics.
Starting Page	2047
Ending Page	2055
Page Count	9
File Format	HTM / HTML PDF
ISSN	20416520
Volume Number	8
Issue Number	3
Journal	Chemical Science
DOI	10.1039/c6sc04206f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	Förster resonance energy transfer Rhodamine Environmental science DTBET TBET AIE
Content Type	Text
Resource Type	Article
Subject	Chemistry

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