PHOTOISOMERIZATION DYNAMICS AND SPECTROSCOPY OF THE POLYMETHINE DYE DTCI

被引：40

作者：

DIPAOLO, RE ^{[1
]}

SCAFFARDI, LB ^{[1
]}

DUCHOWICZ, R ^{[1
]}

BILMES, GM ^{[1
]}

机构：

[1] CONSEJO NACL INVEST CIENT & TECN,CIC,CTR INVEST OPT,RA-1900 LA PLATA,ARGENTINA

来源：

JOURNAL OF PHYSICAL CHEMISTRY | 1995年 / 99卷 / 38期

关键词：

D O I：

10.1021/j100038a008

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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 (phi(NP) = 0.20 +/- 0.03 and phi(PN) = 0.16 +/- 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 internal conversion without passing through an intermediate twisted state is the main deactivation step for the excited photoisomer.

引用

页码：13796 / 13799

页数：4

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