Dielectric behaviour of some monohydric alcohols and their mixtures on dilution by cyclohexane

Results of static and dynamic dielectric measurements up to 36 GHz are reported for the 1-alkanols C-6, C-9 and C-12 and the isomers 4-methyl-2-pentanol (cf. C-6) and 5-nonanol (cf. C-9), moreover of mixtures of two or three of these alcohols, all studied in mixtures with cyclohexane over the whole alcohol concentration range at 20, 30 and 40 degrees C. The apparent dipole moments and the relaxation parameters from a three Debye term analysis of the spectra are discussed. Most of the systems behave qualitatively similar, except those with the two isomers. In particular the behaviour of 5-nonanol is remarkable, which exhibits a rather weak tendency towards self-association in its static as well as dynamic dielectric behaviour, obviously due to steric conditions, but seems to contribute considerably to hetero-association, (C) 1999 Elsevier Science B.V. All rights reserved.