Transient phenomena in the pulse radiolysis of retinyl polyenes. 4. Environmental effects on absorption maximum of retinal radical anion
The absorption-spectral and kinetic behaviors of radical ions of all-trans-retinal in various solvents have been studied by spectrophotometric pulse radiolysis at room temperature. Upon going from nonpolar and polar-nonprotic solvents to polar-protic ones (alcohols), large hyposochromic shifts occur in the absorption maximum (lambda/sub max/) of retinal radical anion. The anion absorption maxima in the alcohols correlate well with solvent dielectric constants. In a number of solvents, parallelism is noted between the energies corresponding to lambda/sub max/'s of retinal anion and of solvated electron (the latter at 77 K and room temperature). Transient phenomena associated with the radical anion (lambda/sub max/'s = 448-460 nm) and the retinyl alcohol radical (lambda/sub max/ = 405 nm) are observed in the course of the pulse radiolysis of retinal in several normal micelles (aqueous). The blue-shifted locations of the anion lambda/sub max/'s strongly suggest a polar-protic, alcohol-like nature of the micellar region where the polyenal resides. 35 references, 8 figures, 2 tables.
- Research Organization:
- Univ. of Notre Dame, IN
- OSTI ID:
- 5813787
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 89:26; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400600* -- Radiation Chemistry
ABSORPTION SPECTROSCOPY
ANIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHEMISTRY
DATA
DECOMPOSITION
DISPERSIONS
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
IONS
KINETICS
LOW TEMPERATURE
MEDIUM TEMPERATURE
MIXTURES
NUMERICAL DATA
ORGANIC COMPOUNDS
POLYENES
PULSES
RADIATION CHEMISTRY
RADIATION EFFECTS
RADICALS
RADIOLYSIS
REACTION INTERMEDIATES
REACTION KINETICS
SOLUTIONS
SOLVENT PROPERTIES
SPECTRA
SPECTROSCOPY
TRANSIENTS
VISIBLE SPECTRA