Deuterium effect on the phosphorescence lifetime of biacetyl crystal and vapor
โ Scribed by R.F. Borkman
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 306 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0009-2614
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๐ SIMILAR VOLUMES
The fluorescence lifetime of xuleneda is found to be longer than that of azulenef?e both in frozen scluticn and under collision-free condition in the vapour. The lifetime of the emission of the isolated molecule decreases with higher energy excitation.
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
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,
It is suggested that the hitherto unexplained drastic temperature, pressure and external deuterium isotope effects on the phosphorescence decay-rate constant (kr) of naphthalene in a single crystal of durene can be consistently explained in terms of the photoinduced hydrogen-abstraction reaction of
From a Stern-Volmer kinetic anzJysis of the naphthtiene-T2 sensitized reaction of cndodicyclopcntzdicne Mth benzenc as the intermediate excitalion carrier, it was concluded that deutcrium substitution increases the Tz-lifetime of nzphthalene. An isotope cffcct of 1.4 + 0.3 was observed for perdeutcr