Year 2005, Month 5 (Section Full Articles, Page 1143)
Laser photolysis of 1-(4-nitrophenyl)-3-methylpyrazole
and 1-ethyl-3-(4-nitrophenyl)-5-chloropyrazole
K. B. Petrushenko,* G. V. Bozhenkov, and V. I. Smirnov
Laser photolysis of 1-(4-nitrophenyl)-3-methylpyrazole
and 1-ethyl-3-(4-nitrophenyl)-5-chloropyrazoleThe spectral kinetic characteristics of the triplet states of 1-(4-nitrophenyl)-3-methyl-
pyrazole (1) and 1-ethyl-3-(4-nitrophenyl)-5-chloropyrazole (2) were studied by the laser
nanosecond photolysis technique in different solvents. The triplet lifetimes (τT) of molecules 1
and 2 were found to depend strongly on the solvent nature. An increase in τT by approximately
two orders of magnitude on going from nonpolar and polar aprotic solvents (τT < 15 ns) to
aqueous-acetonitrile solutions (τT = 1100 ns for a volume acetonitrile to water ratio of 1 : 3)
was analyzed, taking into account the influence of the medium on the relative contribution of
the n,π*- and π,π*-configurations to the lowest triplet state.
 BACK I wish to order PDF file of this article for 25.00 USD
| 
ÐÓÑÑÊÀß ÂÅÐÑÈß
