Direct evidence to support the restriction of intramolecular rotation hypothesis for the mechanism of aggregation-induced emission: temperature resolved terahertz spectra of tetraphenyletheneReportar como inadecuado


Direct evidence to support the restriction of intramolecular rotation hypothesis for the mechanism of aggregation-induced emission: temperature resolved terahertz spectra of tetraphenylethene


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Publication Date: 2013-11-28

Publisher: Royal Society of Chemistry

Language: English

Type: Article

Metadata: Show full item record

Citation: Parrott, E. P. J., Tan, N. Y., Hu, R., Zeitler, J. A., Tang, B. Z., & Pickwell-MacPherson, E. (2013). Direct evidence to support the restriction of intramolecular rotation hypothesis for the mechanism of aggregation-induced emission: temperature resolved terahertz spectra of tetraphenylethene.

Description: This is the accepted version of an article first published in Materials Horizons. The version of record is available from the Royal Society of Chemistry at http://xlink.rsc.org/?DOI=c3mh00078h

The full text of this article is embargoed until 2014-11-28 in accordance with the publisher's policy

Abstract: In contrast to the traditional fluorescent dyes that exhibit a decrease in fluorescence upon aggregation, Aggregation-Induced Emission (AIE) molecules are a family of fluorophors which exhibit increased fluorescence upon aggregation. Consequently, AIE molecules represent an interesting new material with potential applications in fluorescent chemo/biosensors, light emitting devices and medical diagnostics. Numerous mechanisms have been proposed to explain this phenomenon, including isomerisation, and restriction of intramolecular rotations (RIR). However, there has not been any direct experimental evidence to support either one of these hypotheses. Here we use terahertz time-domain-spectroscopy (THz-TDS) and solid-state computational simulations of an AIE molecule to link the increase in intensity of intramolecular rotation and rocking modes to the measured fluorescence and reveal direct evidence supporting the RIR hypothesis. This is the first time that terahertz spectroscopy has been used to directly probe such molecular motions in AIE materials and in doing so we have found conclusive evidence to fully explain the AIE mechanism.

Identifiers:

This record's URL: http://dx.doi.org/10.1039/c3mh00078hhttp://www.repository.cam.ac.uk/handle/1810/245271





Autor: Parrott, Edward P. J.Tan, Nicholas Y.Hu, RongrongZeitler, J. AxelTang, Ben ZhongPickwell-MacPherson, Emma

Fuente: https://www.repository.cam.ac.uk/handle/1810/245271



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