Heat capacities near room temperature of ten solid alkane-alpha, omega-diols HO-(CH2)(n)-OH where n = 6 and 8 <= n <= 16

The molar heat capacities at constant pressure C-p,C-m of a homologous seri es of alkane-alpha, omega-diols HO-(CH2)(n)-OH, where n has values of 6 and (8 to 16), were determined by using differential scanning calorimetry over the temperature range (280 to 310) K, in flowing gas. The measured values of C-p,C-m showed a very good linear dependence on temperature, except 1,9- nonanediol and 1,13-tridecanediol. The heat capacities at T = 298.15 K were obtained by interpolating the smoothed fitting equations as a function of temperature. The contribution to the heat capacity at T = 298.15 K of the C H2 group was derived from the slope of the C-p,C-m values of diols as a fun ction of the number of carbon atoms in their molecules, and compared with t he values obtained from a comprehensive collection of literature data for h omologous alkyl organic compounds in the solid state. (C) 1999 Academic Pre ss.