Role of twisted intramolecular charge transfer in the fluorescence sensitivity of biological probes: diethylaminocoumarin laser dyes

Nag, Ashis ; Bhattacharyya, Kankan (1990) Role of twisted intramolecular charge transfer in the fluorescence sensitivity of biological probes: diethylaminocoumarin laser dyes Chemical Physics Letters, 169 (1-2). pp. 12-16. ISSN 0009-2614

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Official URL: http://linkinghub.elsevier.com/retrieve/pii/000926...

Related URL: http://dx.doi.org/10.1016/0009-2614(90)85156-7

Abstract

7-diethylamino coumarins exhibit large enhancement of fluorescence yield upon binding to bovine serum albumin. It is argued that the polarity-depednent twisted intramolecular charge transfer (TICT) process is responsible for the remarkable fluorescence sensitivity of these biological fluorophores to the environment. The reduction in the rate of TICT in the hydrophobic interior of albumin leads to the increase of fluorescence yield and lifetime.

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