Apparent molar heat capacities of n-Alcohols (C2 to C4) and symmetric Tetraalkylammonium Bromides (C2 to C5) in Water–N,N-Dimethylformamide Mixtures: Methylene Group Contribution and Hydrophobic Hydration

W.E. Waghorne; D.C. Riveros; E.F. Vargas; G. Hefter

doi:10.1007/s10953-016-0498-2

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Apparent molar heat capacities of n-Alcohols (C2 to C4) and symmetric Tetraalkylammonium Bromides (C2 to C5) in Water–N,N-Dimethylformamide Mixtures: Methylene Group Contribution and Hydrophobic Hydration

Journal article

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Apparent molar heat capacities of n-Alcohols (C2 to C4) and symmetric Tetraalkylammonium Bromides (C2 to C5) in Water–N,N-Dimethylformamide Mixtures: Methylene Group Contribution and Hydrophobic Hydration

W.E. Waghorne, D.C. Riveros, E.F. Vargas and G. Hefter

Journal of Solution Chemistry, Vol.45(9), pp.1303-1312

2016

DOI: https://doi.org/10.1007/s10953-016-0498-2

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Abstract

The apparent molar heat capacities, ϕ C p , of ethanol, n-propanol, n-butanol, and tetraethylammonium, tetra-n-propylammonium, tetra-n-butylammonium and tetra-n-pentylammonium bromides have been measured measured using a Picker flow calorimeter (Sodev, Canada, Model CP-Cpr) at 298.15 K in water–N,N-dimethylformamide (DMF) mixtures. The contribution of the CH2 moiety, ϕ C p (CH2), was estimated from these data as the change in ϕ C p per additional CH2 unit. The values of ϕ C p (CH2) in water (ca. 100 J·K−1·mol−1) are two to three times those in neat organic solvents (ca. 30–40 J·K−1·mol−1), consistent with a substantial contribution from hydrophobic solvation in water. In water-rich aqueous DMF solutions, ϕ C p (CH2) decreases monotonically with increasing DMF concentration, the decrease being more rapid for the n-alcohols. This trend differs significantly from that reported in the literature for highly aqueous mixtures of t-butanol, where ϕ C p (CH2) passes through a maximum.

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Title: Apparent molar heat capacities of n-Alcohols (C2 to C4) and symmetric Tetraalkylammonium Bromides (C2 to C5) in Water–N,N-Dimethylformamide Mixtures: Methylene Group Contribution and Hydrophobic Hydration
Authors/Creators: W.E. Waghorne (Author/Creator)
D.C. Riveros (Author/Creator)
E.F. Vargas (Author/Creator)
G. Hefter (Author/Creator)
Publication Details: Journal of Solution Chemistry, Vol.45(9), pp.1303-1312
Publisher: Springer Netherlands
Identifiers: 991005540571107891
Murdoch Affiliation: School of Engineering and Information Technology
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Citation topics: 2 Chemistry; 2.89 Ionic, Molecular & Complex Liquids; 2.89.462 Excess Molar Volumes
Web Of Science research areas: Chemistry, Physical
ESI research areas: Chemistry