Free energy and entropy changes in vertical and nonvertical triplet energy transfer processes between rigid and nonrigid molecules. A laser photolysis study
- Univ. of Chicago, IL (United States)
- Univ. of Chicago, IL (United States) Argonne National Lab., IL (United States)
The free energy and entropy changes associated with intermolecular triplet energy transfer (TT) processes were determined by direct measurement of the equilibrium constant using a laser flash photolysis technique. 10,10-Dimethylanthrone and 9,9-dimethylfluorene were synthesized and used as a rigid donor and acceptor, respectively, in comparison with 4-methylbenzophenone, a nonrigid donor, and 4-methylbiphenyl, a nonrigid acceptor, in the TT reactions. Both the nonrigid donor and the nonrigid acceptor lose entropy while going from the twisted group state to the planar triplet state. The [Delta]S values for 4-methylbenzophenone and 4-methylbiphenyl are 0.5-1.0 and 2.5-3.0 gibbs/mol, respectively. 39 refs., 3 figs., 1 tab.
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6043354
- Journal Information:
- Journal of the American Chemical Society; (United States), Vol. 115:9; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AROMATICS
ELECTRON TRANSFER
PHOTOLYSIS
ENTROPY
FREE ENERGY
LASERS
CHEMICAL REACTIONS
DECOMPOSITION
ENERGY
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
400500* - Photochemistry
400201 - Chemical & Physicochemical Properties