Photochemistry of squaraine dyes. 6. Solvent hydrogen bonding effects on the photophysical properties of bis(benzothiazolylidene)squaraines

Journal Article · Thu Dec 23 04:00:00 EST 1993 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100153a033· OSTI ID:5041969

Das, S ^[1]; Thomas, K G; Ramanathan, R ^[2]; George, M V ^[3]; Kamat, P V ^[4]

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1. Univ. of Notre Dame, IN (United States) Regional Research Lab. (CSIR), Trivandrum (India)
2. Regional Research Lab. (CSIR), Trivandrum (India)
3. Univ. of Notre Dame, IN (United States) Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore (India) Regional Research Lab. (CSIR), Trivandrum (India)
4. Univ. of Notre Dame, IN (United States)

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. 17 refs., 6 figs., 2 tabs.

• OSTI ID: 5041969
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 97:51; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102 -- Chemical & Spectral Procedures
400201* -- Chemical & Physicochemical Properties
400500 -- Photochemistry
ABSORPTION SPECTRA
ALCOHOLS
AROMATICS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
DYES
EMISSION SPECTRA
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE
HYDROXY COMPOUNDS
INFORMATION
LASERS
LIFETIME
LUMINESCENCE
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOLYSIS
SOLVENTS
SPECTRA