The photophysics of nitrocarbazoles used in UV-Maldi matrices: Comparative spectroscopic and optoacoustic studies of mononitro and dinitrocarbazoles.

SERGIO M. BONESI, MARIANA MESAROS, FRANCO M. CABRERIZO, MARIA A. PONCE, GABRIEL M. BILMES, ROSA ERRA-BALSELLS

CHEMICAL PHYSICS LETTERS

Elsevier

Lugar: Netherlands; Año: 2007 vol. 446 p. 49 - 55

0009-2614

The photophysical behavior of 1-nitrocarbazole, 3-nitrocarbazole, 1,6-dinitrocarbazole and 3,6-donitrocarbazole in acetonitrile was studied by using spectroscopic, luminiscence and photoacoustic techniques. Absorption spectra and triplet state transient spectra were recorded and the fT and tT values were determined. Phosphorescence emission at 77 K and the dynamic properties in terms of fp, kp and knr for the mono and dinitrocarbazoles were derived. Results are discussed in terms of the optimised structure of 1-nitrocarbazole, 3-nitrocarbazole, 1,6-dinitrocarbazole and 3,6-donitrocarbazole and are compared with that of carbazole. The nitro group attached to the carbazole moiety induces important changes in the photophysical behavior of these compounds.