Vaporization enthalpies of the a,w-Alkanediols by correlation gas chromatography.

The vaporization enthalpies of 1,2-ethaediol through to 1,10-decanediol 1,12-doecanediol, 1,14-tetradecanediol, 1,16-hexadecanediol, 1,4-butynediol, 2,5-dimethyl-3-hexyne2,5-diol and 2,5-dimethyl-3-hexane-2,5-diol are examined by correlation gas chromatography . A good correlation is observed and the vales evaluated for the 1,ω-alkanediols. Intramolecular hydrogen bonding in the liquid phase of the smaller diols dones not appear to be very important thermochemically and appears to have a minimal effect in the gas phase as judged by the vaporization enthalpies of 1,4-butynediol, 1,4-butanediol, 2,5-dimethyl-3-hexyne-2,5-diol and 2,5-dimethyl 3-hexane 2,5-diol. The sublimation enthalpies of the 1,ω-alkanediols were calculated as the sum of the fusion and vaporization enthalpies at T=298.15K