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The pressure and temperature dependence of the complex permittivity of heptanol isomers

The complex relative permittivity of 1-heptanol, 3-heptanol, 3-methyl-2-hexanol and 2-methyl-2-hexanol has been measured from -30 degrees C to 20 degrees C at pressures up to 350 MPa in the range of frequencies between 50 Hz and 6 MHz. The dispersion in 1-heptanol and 3-heptanol is well characterised by the Debye equation, whereas the other two materials exhibit more than one relaxation time. The activation parameters are calculated and are found to be strongly dependent on the position of the hydroxyl group, and in the case of the branched isomers, of the methyl group. These results are compared with those in the literature for similar octanol isomers, and are discussed in terms of their dependence on liquid structure. The existence of closely ordered and loosely ordered chains is proposed to explain the results.