Inter- and Intramolecular Reorientations in Liquid Crystals

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Abstract
Data of dielectric relaxation measurements so far obtained for isotropic, nematic and solid phases of seven members of di-n-alkoxyazoxybenzene (n-OAOB) homologous series have been reanalysed in order to discuss the influence of the end chains on the molecular reorientations. The relaxation times characterizing the intermolecular reorientations show odd-even alternation in the temperature range both below and above the clearing points. Below the melting temperatures dielectric relaxation processes have been observed for high-temperature solid phases of two substances with n = 4 and 5. The specific behaviour of reorientational dynamics at both clearing and melting points may be related to the corresponding behaviour of thermodynamic quantities.