Photochemistry of sensitizing dyes. Spectroscopic and redox properties of cresyl violet

Journal Article · Thu May 30 04:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100164a044· OSTI ID:5915898

Kreller, D I; Kamat, P V ^[1]

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1. 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), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:11; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

14 SOLAR ENERGY
140505* -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
ABSORPTION SPECTROSCOPY
AMINES
AQUEOUS SOLUTIONS
AROMATICS
AZIDES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMISTRY
CONDENSED AROMATICS
DECOMPOSITION
DISPERSIONS
DYES
ELECTROCHEMISTRY
EMISSION SPECTROSCOPY
ENERGY LEVELS
ETHERS
EXCITED STATES
FLUORESCENCE SPECTROSCOPY
MIXTURES
NITROGEN COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OXIDATION
PHOTOCHEMICAL REACTIONS
PHOTOCHEMISTRY
PHOTOLYSIS
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REAGENTS
REDUCTION
SENSITIZERS
SOLUTIONS
SPECTRA
SPECTROSCOPY
TIME DEPENDENCE
VISIBLE SPECTRA