TY - JOUR
T1 - THE ELECTRONIC SPECTROSCOPY OF PYRIMIDINES
T2 - THE EFFECT OF COVALENTLY BONDED SULFUR ON THE PHOSPHORESCENCE AND ABSORPTION SPECTRA
AU - Pownall, Henry J.
AU - Schaffer, Arnold M.
AU - Becker, Ralph S.
AU - MANTULIN, William W.
N1 - Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 1978/5
Y1 - 1978/5
N2 - 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.
AB - 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.
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U2 - 10.1111/j.1751-1097.1978.tb07655.x
DO - 10.1111/j.1751-1097.1978.tb07655.x
M3 - Article
AN - SCOPUS:84981641769
SN - 0031-8655
VL - 27
SP - 625
EP - 628
JO - Photochemistry and photobiology
JF - Photochemistry and photobiology
IS - 5
ER -