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Effect of solvent polarity on the yield of twisted intramolecular charge transfer (TICT) emission. Competition between formation and nonradiative decay of the TICT state

✍ Scribed by Ashis Nag; Tapanendu Kundu; Kankan Bhattacharyya

Publisher: Elsevier Science
Year: 1989
Tongue: English
Weight: 265 KB
Volume: 160
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(89)87592-x

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✦ Synopsis

The fluorescence quantum yield of the dual emission of dimethylaminobenzonitrile (DMABN) has been measured in a series of isoviscous mixtures of n-octane and propionitrile of differing polarity. With increase in solvent polarity, the yield of the TICT emission initially rises to a maximum and then decreases. Contrary to this, the yield of "nonpolar" emission monotonically decreases with increase in the polarity. This is explained in terms of the competition between the formation and nonradiative decay of the TICT state, both of which are accelerated with increase in solvent polarity.

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