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.
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