Abstract
The mono- and dihydrates of tetraethylammonium acetate, [(C2H5)4N]CH3CO2, were found to be liquids at room temperature even though the corresponding tetrahydrate is a solid. The lower hydrates were synthesized by prolonged drying of the tetrahydrate. The monohydrate melts at 18°C. The 13C NMR and 1H NMR spectra of the monohydrate were consistent with the proposed structure. The monohydrate was stable with respect to decomposition for over one year under N2 at ambient temperature. Both hydrates exhibited large and reversible absorption of CO2 at 50°C. Spectroscopic data were consistent with absorption of CO2 as bicarbonate. The related tetraethylammonium propionate salts containing 2 and 0.9 mol H2O/mol salt were also found to be liquids at room temperature.
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