Abstract
The solid-liquid phase diagrams of binary mixtures of water with tetrabutylammonium carboxylate having an unsaturated alkyl group in the carboxylate anion ((n-C4H9)4NOOCR; R=C2H3-C9H17) were examined in order to confirm the formation of clathrate-like hydrates. The results are summarized as follows:(1) the formation of a clathrate-like hydrate is newly confirmed for all the 13 carboxylates examined; (2) these hydrates are classified into three groups I, II, and III on the basis of the hydration numbers; (3) the group I hydrates, which are formed by the carboxylates with R=C2 and R=C3, have hydration numbers around 30 and are the most stable hydrates among those examined in this study; (4) the group II hydrates, with hydration numbers around 39, are formed by all the carboxylates with R=C4 and C5 including sorbate and are less stable than the group I hydrates; (5) the group III hydrates, with hydration numbers around 30 like the group I hydrates, are formed by carboxylates with long alkyl chains such as 2-octenoate and 2-decenoate and are generally unstable.
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References
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© 1984 D. Reidel Publishing Company
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Nakayama, H., Usui, H. (1984). The Effect of Car Boxy Late Anions on the Formation of Clathrate Hydrates Of Tetrabutylammcnium Carboxylates. In: Atwood, J.L., Davies, J.E.D., Osa, T. (eds) Clathrate Compounds, Molecular Inclusion Phenomena, and Cyclodextrins. Advances in Inclusion Science, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5376-5_27
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DOI: https://doi.org/10.1007/978-94-009-5376-5_27
Publisher Name: Springer, Dordrecht
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