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Enthalpies of dissolution of long chain-length alkyltrimethylammonium bromide salts in water at temperatures from 278.15 to 308.15K
Journal article   Open access   Peer reviewed

Enthalpies of dissolution of long chain-length alkyltrimethylammonium bromide salts in water at temperatures from 278.15 to 308.15K

D.C. Riveros, E.F. Vargas and G. Hefter
The Journal of Chemical Thermodynamics, Vol.81, pp.109-115
2015
DOI: https://doi.org/10.1016/j.jct.2014.09.018
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Abstract

Molar enthalpies of dissolution, ΔslnHm, of decyl-, dodecyl-, tetradecyl- and hexadecyl-trimethylammonium bromide salts (RMe3NBr) in water have been measured calorimetrically as a function of concentration and temperature. Standard state values, ΔslnHm o, were obtained by extrapolation to infinite dilution and showed a smooth variation with the number of carbon atoms, nC, in the alkyl chain R, unlike their shorter congeners (nC ≤ 6). The corresponding molar isobaric heat capacity changes, ΔslnCp,m o, were calculated from the temperature dependence of ΔslnHm o and also varied smoothly with nC but were more than an order of magnitude greater than those of their shorter congeners, probably reflecting a marked increase in hydrophobicity with increasing nC. The behaviour of the RMe3NBr salts was found to parallel broadly that of the symmetrical tetraalkylammonium salts, R4NBr.

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2 Chemistry
2.89 Ionic, Molecular & Complex Liquids
2.89.462 Excess Molar Volumes
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Chemistry, Physical
Thermodynamics
ESI research areas
Chemistry
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