Raman Spectroscopy Studies of Reorientations in Isotropic Phase of Alkoxyazoxybenzenes

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Abstract
Raman spectra for isotropic phase of PAA, PAP and HOAB were recorded. Three benzene rings vibrations were chosen for quantitative analysis and the choice is discussed for different PAA deuteration. The separation of vibrational and rotational relaxation was performed. Vibrational relaxation is a dominating process, but ca. 10% of total bandshape can be attributed to rotational relaxation. Rotational correlation times τ2 were calculated for all studied substances to be of the order 10−11 s. τ2 is connected with the rotation around the long molecular axis and supports the correlation time τ1 received from the dielectric relaxation measurements.