INVESTIGADORES
SCAFFARDI Lucia Beatriz
artículos
Título:
PHOTOISOMERIZATION DYNAMICS AND SPECTROSCOPY OF THE POLYMETHINE DYE DTCI
Autor/es:
R. E. DI PAOLO; L. SCAFFARDI; R. DUCHOWICZ ; G. BILMES
Revista:
JOURNAL OF PHYSICAL CHEMISTRY A
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 1995 vol. 99 p. 13796 - 13799
ISSN:
1089-5639
Resumen:
Laser absorption spectroscopy, laser-induced fluorescence, and pulsed-laser optoacoustic spectroscopy were used to characterize photophysical and spectroscopic parameters of the photoisomer of the cyanine dye 3,3´-diethylthiacarbocyanine iodide (DTCI). Values for the photoisomerization and back-photoisomerization quantum yields (&p = 0.20 f 0.03 and C$PN = 0.16 zt 0.03, respectively), as well as values for absorption cross sections and the energy content of the ground state of the photoisomer, were obtained. The quantum efficiency of fluorescence of this species was found negligible. Similar to the findings for DODCI and Merocyanine 540, these results suggest that intemal conversion without passing through an intermediate twisted state is the main deactivation step for the excited photoisomer.