Pressure-induced emission enhancement of a series of dicyanovinyl-substituted aromatics: pressure tuning of the molecular population with different conformations

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Qian WangGuoqiang Yang

Abstract

A series of dicyanovinyl-substituted aromatic compounds (Ar-DCV; Ar=9-anthracenyl, 1-naphthyl, 1-pyrenyl) with dual fluorescence are prepared, and their emission properties--when molecularly dispersed in a polymer medium--are investigated under pressure perturbation. The total emission intensity is enhanced drastically from ambient pressure up to 70 kbar. Emission 30-107 times more intense than that at ambient pressure is observed at higher pressure. In dual emission, the enhancement of the local excited state (LE state) is significantly different from that of the intramolecular charge-transfer state (ICT state). The intensity of the ICT emission increases faster (30-370 times) than that of the LE emission (less than 20 times). In accordance with spectroscopic data, emission dynamics at different pressures, and computational studies on the molecular conformations of these compounds, a kinetic model is proposed to explain the effect of pressure on the emissive properties of the Ar-DCV compounds from the point of view of pressure-dependent populations of the species in the ground state.

References

Oct 14, 2000·Annual Review of Physical Chemistry·R J Hemley
Aug 9, 2002·Journal of the American Chemical Society·John K GreyChristian Reber
Feb 21, 2003·Nature·C David MüllerKlaus Meerholz
Mar 6, 2004·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Hong LiGuoqiang Yang
Aug 25, 2004·Physical Review Letters·A KadashchukH Bässler
Sep 28, 2005·Physical Chemistry Chemical Physics : PCCP·Ben D AllenChunfang Yu

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Citations

Jan 1, 2014·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Adela NanoAnthony Harriman
Dec 9, 2009·The Journal of Physical Chemistry. B·Ah-Young JeeMinyung Lee
Nov 13, 2014·The Journal of Physical Chemistry. B·Jens BreffkeMark Maroncelli
Aug 18, 2017·The Journal of Physical Chemistry Letters·Yarong GuBo Zou

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