Photophysical and Photochemical Processes of Excited Singlet and Triplet [3n]Cyclophanes (n= 2–6) Studied by Emission Measurements and Steady-State and Laser Flash Photolyses

2015 ◽  
Vol 119 (10) ◽  
pp. 1867-1874 ◽  
Author(s):  
Minoru Yamaji ◽  
Hideki Okamoto ◽  
Yuhko Hakoshima ◽  
Teruo Shinmyozu
Keyword(s):  
Steady State ◽  
Laser Flash ◽  
Excited Singlet ◽  
Photochemical Processes

Primary Photochemical Processes of the Phototoxic Neuroleptic Cyamemazine: A Study by Laser Flash Photolysis and Steady-state Irradiation¶

2007 ◽  
Vol 80 (3) ◽  
pp. 535-541
Author(s):  
Patrice Morlière ◽  
Francisco Bosca ◽  
Miguel A. Miranda ◽  
José V. Castell ◽  
René Santus
Keyword(s):  
Steady State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Photochemical Processes

Primary Photochemical Processes of the Phototoxic Neuroleptic Cyamemazine: A Study by Laser Flash Photolysis and Steady-state Irradiation¶

2004 ◽  
Vol 80 (3) ◽  
pp. 535 ◽  
Author(s):  
Patrice Morlière ◽  
Francisco Bosca ◽  
Miguel A. Miranda ◽  
José V. Castell ◽  
René Santus
Keyword(s):  
Steady State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Photochemical Processes

Trans to cis photoisomerization of N,N′-disubstituted indigo dyes via excited singlet states; a laser flash photolysis and steady state irradiation study

1987 ◽  
Vol 65 (4) ◽  
pp. 708-717 ◽  
Author(s):  
Helmut Görner ◽  
Joseph Pouliquen ◽  
Jean Kossanyi
Keyword(s):  
Steady State ◽  
Triplet State ◽  
Room Temperature ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Excited Singlet ◽  
Triplet Energy ◽  
Direct Excitation ◽  
Indigo Dyes

The relaxation pathways of excited trans-N,N′-diacylindigo dyes (trans-1–trans-4) and of the rigid trans (5) and cis (6) indigo analogues have been studied by nanosecond flash photolysis and steady state measurements. In fluid solution the trans to cis photoisomerization of 1–4 occurs via a singlet excited state mechanism on direct excitation, and the triplet state appears to be reached only by sensitized reaction. The lower quantum yield for trans → cis isomerization of 2–4 at room temperature, as compared to 1, is due to a thermally activated internal conversion step leading to the trans ground state. This pathway competes with fluorescence and twisting of the molecule around the central double bond in the excited singlet state. Increasing the viscosity of the medium decreases the twisting of the flexible molecules and, as a consequence, increases the population of the lowest triplet state. A triplet transient, the intensity of which increases with the viscosity of the medium, could be characterized at low temperature under direct excitation. A transient species, which can be assigned to a triplet state on the basis of quenching experiments and on the fact that the same transient could be found under sensitized conditions, also has been observed at room temperature for the rigid 5 and 6 molecules. Quenching measurements of triplet sensitizers by 5, trans-1, and trans-2 enables the localization of the triplet energy at around 40 kcal/mol.

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

Phototransformations of bridgehead-substituted dibenzobarrelenes. Steady-state and laser flash photolysis studies

1987 ◽  
Vol 52 (25) ◽  
pp. 5512-5517 ◽  
Author(s):  
S. Pratapan ◽  
K. Ashok ◽  
D. R. Cyr ◽  
P. K. Das ◽  
M. V. George
Keyword(s):  
Steady State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash

Photochemistry of triphenylamine (TPA) in homogeneous solution and the role of transient N-phenyl-4a,4b-dihydrocarbazole. A steady-state and time-resolved investigation.

2021 ◽  
Author(s):  
Stefano Protti ◽  
Mariella Mella ◽  
Sergio Mauricio Bonesi
Keyword(s):  
Steady State ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Homogeneous Solution ◽  
Laser Flash ◽  
Time Resolved ◽  
Homogeneous Media

Abstract. The photoreactivity of triphenylamine in homogeneous media has been investigated by means of laser flash photolysis spectroscopy and preparative experiments. The goal of this study consists in the evaluation...

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