| Numéro |
J. Phys. IV France
Volume 04, Numéro C7, Juillet 1994
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique |
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|---|---|---|
| Page(s) | C7-323 - C7-325 | |
| DOI | https://doi.org/10.1051/jp4:1994777 | |
8th International Topical Meeting on Photoacoustic and Photothermal Phenomena
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-323-C7-325
DOI: 10.1051/jp4:1994777
1 Max-Planck-Institut für Strahlenchemie, 45413 Mülheim an der Ruhr, Germany
2 Max-Planck-Institut für Kohlenforschung, 45466 Mülheim an der Ruhr, Germany
© EDP Sciences 1994
8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-323-C7-325
DOI: 10.1051/jp4:1994777
Molecular volume changes in cyanines. A laser-induced optoacoustic study
M.S. Churio1, K.P. Angermund2 and S.E. Braslavsky11 Max-Planck-Institut für Strahlenchemie, 45413 Mülheim an der Ruhr, Germany
2 Max-Planck-Institut für Kohlenforschung, 45466 Mülheim an der Ruhr, Germany
Abstract
The molecular movements taking place during the E -Z photoisomerization of the
carbocyanines 3,3' -diethyloxadicarbocyanine iodide (DODCI) and 3,3' -diethyloxacarbocyanine
iodide (DOCI) were studied in ethanol-water mixtures using solvent- and temperature-dependent
laser-induced optoacoustic spectroscopy (LIOAS) with nanosecond excitation and 1-µs heat
integration time. The contraction measured for the DODCI photoisomerization is attributed to
solvent rearrangement around the DODCI isomers with different dipole moments, as evaluated
using force field calculations. No volume change was observed for the DOCI
photoisomerization.
© EDP Sciences 1994