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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H. Nakayama and S. Torigata,Bull. Chem. Soc. Jpn.,57, 171 (1984).
R. K. McMullan, M. Bonamico, and G. A. Jeffrey,J. Chem. Phys.,39, 3295 (1963).
H. Nakayama,Bull. Chem. Soc. Jpn.,56, 877 (1983).
Yu. A. Dyadin, L. S. Aladko, L. A. Gaponenko, and T. M. Polyanskaya,Izv. Sib. Otd. Akad. Nauk SSSR, Ser. Khim. Nauk,1981 (9), 19.
M. Bonamico, G. A. Jeffrey, and R. K. McMullan,J. Chem. Phys.,37, 2219 (1962).
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Nakayama, H., Usui, H. The effect of carboxylate anions on the formation of clathrate hydrates of tetrabutylammcnium carboxylates. Journal of Inclusion Phenomena 2, 249–257 (1984). https://doi.org/10.1007/BF00663263
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DOI: https://doi.org/10.1007/BF00663263