Das, Suresh ; Thomas, George K. ; Ramanathan, R. ; George, M. V. ; Kamat, P. V. (1993) Photochemistry of squaraine dyes. 6. Solvent hydrogen bonding effects on the photophysical properties of bis(benzothiazolylidene)squaraines Journal of Physical Chemistry, 97 (51). pp. 13625-13628. ISSN 0022-3654
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Official URL: http://pubs.acs.org/doi/abs/10.1021/j100153a033
Related URL: http://dx.doi.org/10.1021/j100153a033
Abstract
The photophysical properties of two bis(benzothiazolylidene)squaraine dyes have been studied in aromatic hydrocarbon and alcoholic solvents. These dyes exhibit fluorescence quantum yields of 0.06-0.52 and excited singlet lifetimes of 0.48-2.5 ns in these solvents. Although the photophysical properties of the dyes are independent of solvent polarity in the hydrocarbon solvents, in alcoholic solvents a marked hyposchromic shift in the absorption and emission spectra and a reduction in lifetimes of excited state have been observed. These effects have been correlated with the hydrogen bond donating ability of the alcoholic solvents.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to American Chemical Society. |
| ID Code: | 8802 |
| Deposited On: | 28 Oct 2010 10:49 |
| Last Modified: | 31 May 2011 07:25 |
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