Photochemistry of sensitizing dyes. Spectroscopic and redox properties of cresyl violet
- Univ. of Notre Dame, IN (United States)
The photosensitizing properties of cresyl violet have been investigated by characterizing singlet and triplet excited states and the reduced and oxidized forms of the dye by picosecond and nanosecond laser flash photolysis. The dye readily forms a charge-transfer complex with amines with complexation constants in the range of 49-3,350 M{sup {minus}1} in methanol. The dye in its singlet and triplet excited states has lifetimes of 2.46 ns and 68 {mu}s, respectively, in acetonitrile. The excited triplet is quenched by ground-state dye molecules with a bimolecular rate constant of 1.45 {times} 10{sup 9} M{sup {minus}1} s{sup {minus}1}. The semioxidized radical of the dye has been generated by oxidation of CV{sup +} with pulse radiolytically generated azide radicals (k = 1.6 {times} 10{sup 10} M{sup {minus}1} s{sup {minus}1}) in aqueous medium. The semireduced dye has been generated by quenching of triplet dye with triphenylamine (k = 1.4 {times} 10{sup 9} M{sup {minus}1} s{sup {minus}1}) in methanol. Photoelectrochemical reduction of cresyl violet in colloidal TiO{sub 2} suspension has also been carried out, with a quantum yield of 0.013.
- OSTI ID:
- 5915898
- Journal Information:
- Journal of Physical Chemistry; (United States), Vol. 95:11; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DYES
PHOTOCHEMISTRY
ABSORPTION SPECTROSCOPY
AMINES
AQUEOUS SOLUTIONS
AZIDES
CONDENSED AROMATICS
ELECTROCHEMISTRY
ETHERS
EXCITED STATES
FLUORESCENCE SPECTROSCOPY
ORGANIC NITROGEN COMPOUNDS
OXIDATION
PHOTOLYSIS
RADICALS
RADIOLYSIS
REDUCTION
SENSITIZERS
TIME DEPENDENCE
VISIBLE SPECTRA
AROMATICS
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DISPERSIONS
EMISSION SPECTROSCOPY
ENERGY LEVELS
MIXTURES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHOTOCHEMICAL REACTIONS
RADIATION EFFECTS
REAGENTS
SOLUTIONS
SPECTRA
SPECTROSCOPY
140505* - Solar Energy Conversion- Photochemical
Photobiological
& Thermochemical Conversion- (1980-)
400500 - Photochemistry