Pillai, Zeena S. ; Sudeep, P. K. ; George Thomas, K. (2003) Effect of viscosity on the singlet-excited state dynamics of some hemicyanine dyes Research on Chemical Intermediates, 29 (3). pp. 293-305. ISSN 0922-6168
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Official URL: http://www.springerlink.com/content/xwgp8pwl72mtr0...
Related URL: http://dx.doi.org/10.1163/156856703764929958
Abstract
Photophysical properties of hemicyanine dyes (1-3) were investigated in solvents of varying polarity and viscosity. Hemicyanines possess relatively low fluorescence quantum yields (≤ 1%) in polar solvents. A significant increase in fluorescence quantum yield and lifetimes was observed with increase in viscosity of the solvent medium. The radiative, as well as nonradiative decay channels from the singlet-excited state were investigated by varying the viscosity of the medium. The viscosity-dependent radiationless relaxation observed in hemicyanine dyes is suggestive of a restricted rotor motion in the singlet excited state.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to Springer. |
| Keywords: | Hemicyanines; Singlet Excited State; Viscosity; Polarity; Nonradiative Rate Contstants; Radiative Rate Constants |
| ID Code: | 51422 |
| Deposited On: | 28 Jul 2011 11:44 |
| Last Modified: | 28 Jul 2011 11:44 |
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