Photophysics of 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine: emission from two states

Mallick, Arabinda ; Maiti, Subhendu ; Haldar, Basudeb ; Purkayastha, Pradipta ; Chattopadhyay, Nitin (2003) Photophysics of 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine: emission from two states Chemical Physics Letters, 371 (5-6). pp. 688-693. ISSN 0009-2614

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Official URL: http://www.sciencedirect.com/science/article/pii/S...

Related URL: http://dx.doi.org/10.1016/S0009-2614(03)00358-0

Abstract

Steady state photophysics of 3-acetyl-4-oxo-6,7-dihydro-12H indolo-[2,3-a] quinolizine (AODIQ) has been studied in different pure and mixed solvents. The fluorometric behaviour of AODIQ is modified dramatically with a change in the solvent polarity. The fluorescence quantum yield, when plotted against the solvent polarity parameter (ET(30)), passes through a maximum. Plot of the fluorescence parameters in a graded series of dioxane-water mixture against ET(30) shows segmented linearity with two independent slopes; reflecting a lower sensitivity in the less polar region and a much higher sensitivity in higher polarity range. The observations lead to the proposition that the fluorescence of AODIQ originates from two different states, viz., a locally excited (LE) and a charge transfer (CT) one. Studies of the phosphorescence and heavy atom quenching of the fluorescence reveal that the CT state lies above the lowest triplet state even in a very polar environment.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:67403
Deposited On:31 Oct 2011 04:52
Last Modified:31 Oct 2011 04:52

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