Triene photophysics and photochemistry: previtamin D/sub 3/

Journal Article · Wed Apr 13 00:00:00 EDT 1988 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00216a030· OSTI ID:7247004

Dauben, W G; Share, P E; Ollmann, Jr, R R

The origin of the wavelength dependent photochemical behavior of previtamin D/sub 3/ was investigated. The fluorescence spectrum and quantum yield of previtamin D/sub 3/ were determined at 302 and 307 nm, and both the intensity distribution and the fluorescence quantum yields were found to be independent of excitation energy. A large Stokes shift was observed which is consistent with an excited state torsional relaxation about the central double bond of the triene. The excited state displacement was reproduced by QCFF/PI calculations of the ground and excited states of a model compound. The excited state involved in the absorption and emission spectra is discussed.

• Research Organization: Univ. of California, Berkeley (USA)
• OSTI ID: 7247004
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 110:8; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
CHEMICAL BONDS
CHEMISTRY
CHOLECALCIFEROL
DATA
DOUBLE BONDS
EFFICIENCY
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
GROUND STATES
INFORMATION
NUMERICAL DATA
PHOTOCHEMISTRY
QUANTUM EFFICIENCY
SPECTROSCOPY
VITAMIN D
VITAMINS