Investigation of singlet–triplet transitions by the phosphorescence excitation method. Spectroscopic determination of intersystem crossing quantum yields and extinction coefficients of singlet–triplet transitions

1966 ◽  
Vol 0 (14) ◽  
pp. 446-447 ◽  
Author(s):  
Raymond F. Borkman ◽  
David R. Kearns
Keyword(s):  
Spectroscopic Determination ◽  
Quantum Yields ◽  
Intersystem Crossing ◽  
Extinction Coefficients ◽  
Excitation Method

Photochemistry of α-chloro- and α-bromoacetophenone. Determination of extinction coefficients for halogen–benzene complexes

1988 ◽  
Vol 66 (6) ◽  
pp. 1474-1478 ◽  
Author(s):  
W. G. McGimpsey ◽  
J. C. Scaiano
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Benzene Solution ◽  
Halogen Bond ◽  
Bond Cleavage ◽  
Laser Flash ◽  
Quantum Yields ◽  
Extinction Coefficients ◽  
Transient Data

The photochemical dehalogenation of α-haloacetophenones (Cl, Br) in benzene solution has been examined under conditions of continuous and pulsed laser irradiation. Product and quantum yield studies indicate that carbon-halogen bond cleavage occurs with quantum yields of 0.88 and 0.41 for α-chloro- and α-bromoacetophenone, respectively. These values are based on trapping studies in which the PhC(O)ĊH2 radicals produced photochemically are scavenged by hydrogen donors such as benzenethiol. Laser flash photolysis studies lead to intense transient signals due to benzene–halogen complexes. Combination of transient data and quantum yields lead to extinction coefficients of 1 800 and 23 700 M−1 cm−1 for the chlorine (490 nm) and bromine (550 nm) complexes, respectively.

scholarly journals Spectroscopic Determination of an Anion−π Bond Strength

2019 ◽  
Vol 141 (15) ◽  
pp. 6132-6135 ◽  
Author(s):  
Cate S. Anstöter ◽  
Joshua P. Rogers ◽  
Jan R. R. Verlet
Keyword(s):  
Bond Strength ◽  
Spectroscopic Determination

One-photon VUV-MATI and two-photon IR+VUV-MATI spectroscopic determination of oxetane cation ring-puckering vibrations and conformation

2021 ◽  
Vol 154 (5) ◽  
pp. 054308
Author(s):  
Do Won Kang ◽  
Sung Man Park ◽  
Chung Bin Park ◽  
Bong June Sung ◽  
Hong Lae Kim ◽  
...  
Keyword(s):  
Spectroscopic Determination ◽  
Two Photon ◽  
Ring Puckering
Sign in / Sign up

Export Citation Format

Share Document