Abstract— The phosphorescence of uracil, 2‐thiouracil, 2,4‐dithiouracil and 2‐mercaptopyrimidine was studied at 77 K. 2‐Thiouracil and 2,4‐dithiouracil showed phosphorescence quantum yields of 0.65 and 0.1, respectively. The emitting triplet states of these compounds have been assigned as the 3(π, π*) type. The enhancement of spin‐orbit coupling through the involvement of the 3d orbitals on sulfur has been invoked in describing emission characteristics of thiouracils.
|Original language||English (US)|
|Number of pages||4|
|Journal||Photochemistry and photobiology|
|State||Published - 1978|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry