Photoinduced Bond Dissociation of 4-Methylcoumarin Derivatives in Solution Studied by Laser Flash Photolysis and DFT Calculations

2009 ◽  
Vol 113 (20) ◽  
pp. 5815-5822 ◽  
Author(s):  
Minoru Yamaji ◽  
Koichi Nozaki ◽  
Xavier Allonas ◽  
Satoru Nakajima ◽  
Shozo Tero-Kubota ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Bond Dissociation

scholarly journals New core-pyrene π structure organophotocatalysts usable as highly efficient photoinitiators

2013 ◽  
Vol 9 ◽  
pp. 877-890 ◽  
Author(s):  
Sofia Telitel ◽  
Frédéric Dumur ◽  
Thomas Faury ◽  
Bernadette Graff ◽  
Mohamad-Ali Tehfe ◽  
...  
Keyword(s):  
Free Radicals ◽  
Dft Calculations ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Alkyl Halide ◽  
Laser Flash ◽  
Absorption Property ◽  
Sulfonium Salts ◽  
The Core ◽  
Initiation Step

Eleven di- and trifunctional compounds based on a core-pyrene π structure (Co_Py) were synthesized and investigated for the formation of free radicals. The application of two- and three-component photoinitiating systems (different Co_Pys with the addition of iodonium or sulfonium salts, alkyl halide or amine) was investigated in detail for cationic and radical photopolymerization reactions under near-UV–vis light. The proposed compounds can behave as new photocatalysts. Successful results in terms of rates of polymerization and final conversions were obtained. The strong MO coupling between the six different cores and the pyrene moiety was studied by DFT calculations. The different chemical intermediates are characterized by ESR and laser flash photolysis experiments. The mechanisms involved in the initiation step are discussed, and relationships between the core structure, the Co_Py absorption property, and the polymerization ability are tentatively proposed.

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

Effect of Aggregation on Bacteriochlorin a Triplet-state Formation: A Laser Flash Photolysis Study¶

2002 ◽  
Vol 76 (5) ◽  
pp. 480 ◽  
Author(s):  
Xavier Damoiseau ◽  
Francis Tfibel ◽  
Maryse Hoebeke ◽  
Marie-Pierre Fontaine-Aupart
Keyword(s):  
Triplet State ◽  
State Formation ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash

A Laser Flash Photolysis and Pulse Radiolysis Study of Primary Photochemical Processes of Flumequine¶

2000 ◽  
Vol 72 (4) ◽  
pp. 451 ◽  
Author(s):  
M. Bazin ◽  
F. Bosca ◽  
M. L. Marin ◽  
M. A. Miranda ◽  
L. K. Patterson ◽  
...  
Keyword(s):  
Pulse Radiolysis ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Photochemical Processes

Laser Flash Photolysis Studies of the UVA Sunscreen Mexoryl® SX

1999 ◽  
Vol 70 (3) ◽  
pp. 292
Author(s):  
Ann Cantrell ◽  
David J. McGarvey ◽  
Louise Mulroy ◽  
T. George Truscott
Keyword(s):  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash

Singlet Methylene Removal Rate Constants from the (0,1,0) Vibrational Level: Enhancement via Complex-Mediated Vibrational Relaxation

2001 ◽  
Vol 215 (6) ◽  
Author(s):  
M.A. Buntine ◽  
G.J. Gutsche ◽  
W.S. Staker ◽  
M.W. Heaven ◽  
K.D. King ◽  
...  
Keyword(s):  
Vibrational Level ◽  
Rate Constants ◽  
Vibrational Relaxation ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Removal Rate ◽  
Laser Flash ◽  
Laser Absorption ◽  
Photolysis Laser ◽  
Singlet Methylene

The technique of laser flash photolysis/laser absorption has been used to obtain absolute removal rate constants for singlet methylene,

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