Re. Dipaolo et Jo. Tocho, ROTATIONAL DIFFUSION PARAMETERS OF CYANINE DYES DETERMINED BY DEPOLARIZATION OF LUMINESCENCE, Journal of luminescence, 72-4, 1997, pp. 481-483
The polarization anisotropy of the luminescence of several cyanine dye
s in solution were measured under CW laser excitation as a function of
the temperature. The iodide salt of diethyloxacarbocyanine (DOCI), di
ethyloxadicarbocyanine (DODCI), diethylthiacarbocyanine (DTCI) and die
thylthiadicarbocyanine (DTDCI) have been studied in ethanol. Experimen
tal results were interpreted in terms of asymmetric rotor models, in o
rder to find out the effective molecular volume in solution and to dec
ide between two hydrodynamic boundary conditions (stick-slip).