Vapour pressures and enthalpies of vaporization of a series of aromatic ethers of mono-, di- and triethylene glycol

Structure–Property Relationships in Ionic Liquids: A Study of the Influence of N(1) Ether and C(2) Methyl Substituents on the Vaporization Enthalpies of Imidazolium-Based Ionic Liquids

“…It is apparent from this plot that the vaporization enthalpies of the ether-functionalized ILs are systematically ∼10 kJ·mol –1 lower than those of the corresponding members of the [C n mim][NTf 2 ] series. This observation contradicts our expectations from molecular liquids, for which the enthalpies of vaporization of poly(ether)s are always ∼5 kJ·mol –1 higher than those of their alkane homomorphs, as evidenced by the pairs ethylene glycol dimethyl ether (36.8 kJ·mol –1 ) and n -hexane (31.7 kJ·mol –1 ), diethylene glycol dimethyl ether (51.2 kJ·mol –1 ) and n -nonane (46.4 kJ·mol –1 ), and triethylene glycol dimethyl ether (64.7 kJ·mol –1 ) and n -dodecane (61.5 kJ·mol –1 )…”

“…54 To perform the comparison properly, we applied the homomorph concept. 55 molecular liquids, for which the enthalpies of vaporization of poly(ether)s are always ∼5 kJ•mol −1 higher than those of their alkane homomorphs, as evidenced by the pairs ethylene glycol dimethyl ether (36.8 kJ•mol −1 ) 56 and n-hexane (31.7 kJ•mol −1 ), diethylene glycol dimethyl ether (51.2 kJ•mol −1 ) 57 and nnonane (46.4 kJ•mol −1 ), 57 and triethylene glycol dimethyl ether (64.7 kJ•mol −1 ) 56 and n-dodecane (61.5 kJ•mol −1 ). 57 These results for ILs are also in contrast to the findings of our prior works that ether-functionalized imidazoles and benzimidazoles exhibit vaporization enthalpies that are larger than those of their alkyl-functionalized homomorphs.…”

Vaporization enthalpies of a series of the halogen-substituted fluorobenzenes

“…For example, vaporization enthalpies D g 1 H m (298.15 K) exhibit a good linear function of the number of carbon atoms in the chain of the homologous series of n-alkanes [12] or n-alkyl-nitriles [13]. Linear correlations of D g 1 H m (298.15 K) of the geminal substituted azides [14] or aromatic ethers [15] with the data for similar structured molecules can be also used to evaluate the experimental data.…”

Vapor pressures and enthalpies of vaporization of azides

“…The correlation of the enthalpies of vaporization with the number of C-atoms within the series of homologues is well documented. Vaporization enthalpies D g l H m ð298:15 KÞ appear to be a linear function of the number of carbon atoms of the alkanes [27][28][29][30][31][32][33] or nitriles [28]. The plot of D g l H m ð298:15 KÞ against the number of C-atoms in the alkyl chain of alkyl-azides (N C ) is presented in figure 3.…”