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โœฆ   LIBER   โœฆ

Pseudorotation and the environmental effects of the phosphorescence lifetime of benzene

โœ Scribed by S Fischer


Publisher
Elsevier Science
Year
1971
Tongue
English
Weight
559 KB
Volume
10
Category
Article
ISSN
0009-2614

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โœฆ Synopsis


The strong temperature dependence of the phosphorescent decay rate of benzene is at&ii&e& to pseudorotational motion of benzene which hk the lowered DZJ, symmetry in the triplet state. This mod@ ZUXOKI+ for the unusual deuteriun effect of the activation energy, the,very large pre-exponential factor, the low onset tqwratwe, ami the sohmlt effects.


๐Ÿ“œ SIMILAR VOLUMES


Effect of partial and complete deuterati
โœ J.D. Laposa; H. Singh ๐Ÿ“‚ Article ๐Ÿ“… 1969 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 229 KB

Phosphorescence lifetimes measured for C6K5CCH. C6H5CCD, C6D$CH, and C6D5CCD in rigid glasses at 77% show that deuterium substitution for the single acetylenic hydrogen has almost the same effect as deuterium substitution for all five phenyl ring hydrogens in altering the radiationless deactivation

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## Renzophcboqc shows phosphoiescence emission from three different spectroscopic ground st+.te species in water &ssv solutions at 77 K. A study of the effect of solvent acidity indicates that their reciprocti interconversion depends on tic environmen tal conditions.

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The phosphorescence lifetime of carbazole in various homopolymer matrices was found to be highly dependent on additive concentration, temperature and supporting matrix. A partially deuterated polystyrene matrix caused a decrease in lifetime relative to that obtained for carbazole in the absence of d

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Using modified CNDO/S/CI wavefunctions, the effects of 10, 20, 30 and no CI on the oscillator strength of the TI -c So transition and phosphorescence Lifetim= of pyrazine was investigated. From these caiculations, it was determined that although the individuaI numbers vzried, the order of magnitude