Characterization of the indole triplet excited state in proteins utilizing laser flash photolysis

1988 ◽  
Vol 15 (6) ◽  
pp. 337-348 ◽  
Author(s):  
Camillo Ghiron ◽  
Marc Bazin ◽  
René Santus
Keyword(s):  
Excited State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Triplet Excited State

Characterization of the triplet excited state of the phenylxanthenium carbocation

1992 ◽  
Vol 70 (1) ◽  
pp. 280-282 ◽  
Author(s):  
L. J. Johnston ◽  
D. F. Wong
Keyword(s):  
Electron Transfer ◽  
Excited State ◽  
Radical Cation ◽  
Transient Absorption ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Triplet Excited State ◽  
Triplet Absorption

The triplet excited state of the 9-phenylxanthenium cation has been observed directly by both luminescence and transient absorption techniques. The triplet–triplet absorption shows λmax ≤ 300 nm and decays over a period of several microseconds in the absence of easily oxidized donors. The triplet cation reacts with 9-phenylxanthydrol and biphenyl via electron transfer to give the corresponding radical and radical cation and also reacts rapidly with both oxygen and 1,3-cyclohexadiene. Keywords: carbocations, triplets, electron transfer, laser flash photolysis.

Formation and Direct Detection of Non-Conjugated Triplet 1,2-Biradical from β,γ-Vinylarylketone

2015 ◽  
Vol 68 (11) ◽  
pp. 1707 ◽  
Author(s):  
H. Dushanee M. Sriyarathne ◽  
Kosala R. S. Thenna-Hewa ◽  
Tianeka Scott ◽  
Anna D. Gudmundsdottir
Keyword(s):  
Rate Constant ◽  
Density Functional ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Direct Detection ◽  
Density Functional Theory Calculations ◽  
Laser Flash ◽  
Triplet Excited State ◽  
Functional Theory

Laser flash photolysis of 2-methyl-1-phenylbut-3-en-1-one (1) conducted at irradiation wavelengths of 266 and 308 nm results in the formation of triplet 1,2-biradical 2 that has λmax at 370 and 480 nm. Biradical 2 is formed with a rate constant of 1.1 × 107 s–1 and decays with a rate constant of 2.3 × 105 s–1. Isoprene-quenching studies support the notion that biradical 2 is formed by energy transfer from the triplet-excited state of the ketone chromophore of 1. Density functional theory calculations were used to verify the characterization of triplet biradical 2 and validate the mechanism for its formation. Thus, it has been demonstrated that intramolecular sensitization of simple alkenes can be used to form triplet 1,2-biradicals with the two radical centres localized on the adjacent carbon atoms.

CO-Bond Cleavage of Esters with a Naphthyl Group in the Higher Triplet Excited State during Two-Color Two-Laser Flash Photolysis

2007 ◽  
Vol 13 (11) ◽  
pp. 3143-3149 ◽  
Author(s):  
Xichen Cai ◽  
Masanori Sakamoto ◽  
Minoru Yamaji ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Excited State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Bond Cleavage ◽  
Laser Flash ◽  
Triplet Excited State

The C–O bond dissociation of naphthoxymethyl compounds in the higher triplet excited state using two-color two-laser flash photolysis

2007 ◽  
Vol 443 (4-6) ◽  
pp. 248-252 ◽  
Author(s):  
Xichen Cai ◽  
Minoru Yamaji ◽  
Masanori Sakamoto ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Excited State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Triplet Excited State ◽  
Bond Dissociation

α-Bond Dissociation ofp-Phenylbenzoyl Derivatives in the Higher Triplet Excited State Studied by Two-Color Two-Laser Flash Photolysis

2009 ◽  
Vol 113 (9) ◽  
pp. 1696-1703 ◽  
Author(s):  
Minoru Yamaji ◽  
Xichen Cai ◽  
Masanori Sakamoto ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Excited State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Triplet Excited State ◽  
Bond Dissociation
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