bbservations of the phosphorescence decay of isotopic mixtures of naphthalene-ha and d &hD p enanthrene-h 10 and -dlo, and chrysene-h Iz and d12, in ethanol solutions at 77 K are anaIyscd to determine !he ratio .k~/k~ of the tripIet radiative rate parameters of the perprotonated and perdeuterated co
Concentration effects on the phosphorescence of benzenoid hydrocarbons
β Scribed by R.B. Cundall; L.C. Pereira
- Publisher
- Elsevier Science
- Year
- 1974
- Tongue
- English
- Weight
- 392 KB
- Volume
- 29
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
Vuiation of concentration ofCeH6, C6D6, CiHsCH3, and o-CgH+(CH& in metbylcyclohexane ~~e.s a de-ae&ce in the ratio of phosphorescence to fluorescence yields and also the phosphorescence decay times at 77 K. The detection of delayed fluorescence shows that triplet-triplet annihilation czn explain the observed effects.
π SIMILAR VOLUMES
In 1973, Hall noticed that the total -electron energy E of isomeric Ε½ . benzenoid hydrocarbons is a linear function of the number of Kekule structures K . Εince then, this remarkable rule has been confirmed on a plethora of examples. Twenty Ε½ . years later, it was discovered that for large benzenoid
A method for the estimation of E,,, the number of benzenoid systems with h hexagons, is presented. B,, is predicted to lie between 3.200x lo6 and 3.202x 106. This is a significant improvement on the earlier result which located BI1 between 3.080~ lo6 and 3.300x 106.
Phosphorescence from pyrene and naphthalene in the vapour phase has been obsrved. The lifetime and quantum yields are studied between 0.04 and 10 torr.