Excited state dipole moments and lifetimes of 2-cyanoindole from rotationally resolved electronic Stark spectroscopy

Autor: Marie-Luise Hebestreit, Christian Henrichs, Hilda Lartian, Ralf Kühnemuth, Michael Schmitt, W. Leo Meerts
Rok vydání: 2021
Předmět:
Zdroj: Physical Chemistry Chemical Physics. 23:10196-10204
ISSN: 1463-9084
1463-9076
DOI: 10.1039/d1cp00097g
Popis: The permanent dipole moments of 2-cyanoindole (cyanoindole = CNI) in its ground and lowest excited singlet states have been determined from rotationally resolved electronic Stark spectroscopy under jet-cooled conditions. From the orientation of the transition dipole moment and the geometry changes upon electronic excitation the lowest excited singlet state could be shown to be of Lb-symmetry. The general statement, that the La-state has the larger permanent dipole moment of the two lowest excited singlet states, will be challenged in this contribution. On the basis of the different electronic nature of the first excited singlet state the behavior of 2-, 3-, 4- and 5-CNI is discussed. The excited state lifetime of isolated 2-CNI in the gas phase has been determined to be 9.4 ns. This value is compared to the excited state lifetime in ethyl acetate solution of 2.6 ns, which was quantified with a Strickler–Berg analysis. Using water as solvent shortens the 2-CNI lifetime to
Databáze: OpenAIRE
Pro tento záznam nejsou dostupné žádné jednotky.