✍ Scribed by F. Heisel; J.A. Miehé; J. Rachidi
No coin nor oath required. For personal study only.
The influence of viscosity on the electronic relaxation of pinacyanol in alcoholic solutions has been determined by recording, with picosecond and nanosecond resolution, the fluorescence decay at various temperatures, The results are interpreted with the aid of a model of electronic relaxation implying a molecular conformational change with no internal potential barrier and with a Boltzmann equilibrium distribution of the initial configuration. Furthermore, fluorescence depolarization analysis indicates that the reorientational relaxation of the molecule takes place on a time scale much greater than that characterizing the intramolecular geometrical change.
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## Abstract The proton spectrum with ^13^C satellites of benzaldehyde oriented in a liquid crystal solvent has been analysed and the structure of the proton and carbon skeleton has been determined. The large number of observed direct couplings also allows the study of the intramolecular rotation. T