The photophysics of 2-cyanoindole probed by femtosecond spectroscopy.
Photochem Photobiol Sci
; 22(4): 745-759, 2023 Apr.
Article
en En
| MEDLINE
| ID: mdl-36495408
ABSTRACT
The photophysics of 2-cyanoindole (2-CI) in solution (water, 2,2,2-trifluoroethanol, acetonitrile' and tetrahydrofuran) was investigated by steady-state as well as time resolved fluorescence and absorption spectroscopy. The fluorescence quantum yield of 2-cyanoindole is strongly sensitive to the solvent. In water the quantum yield is as low as 4.4 × 10-4. In tetrahydrofuran, it amounts to a yield of 0.057. For 2-CI dissolved in water, a bi-exponential fluorescence decay with time constants of â¼1 ps and â¼8 ps is observed. For short wavelength excitation (266 nm) the initial fluorescence anisotropy is close to zero. For excitation with 310 nm it amounts to 0.2. In water, femtosecond transient absorption reveals that the fluorescence decay is solely due to internal conversion to the ground state. In aprotic solvents, the fluorescence decay takes much longer (acetonitrile â¼900 ps, tetrahydrofuran â¼2.6 ns) and intersystem crossing contributes.
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1
Banco de datos:
MEDLINE
Idioma:
En
Revista:
Photochem Photobiol Sci
Asunto de la revista:
BIOLOGIA
/
QUIMICA
Año:
2023
Tipo del documento:
Article
País de afiliación:
Alemania