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- W2085277363 abstract "Layers of glassy aqueous H2O (D2O) solutions of KH12CO3(K212CO3, K213CO3) and of excess HBr (DBr) or of excess HCl have been deposited sequentially at 78 K in the form of droplets, and their reaction has been studied by FTIR spectroscopy (from 4000 to 400 cm–1) from 78 to 300 K. Protonation of HCO3–/CO32– apparently occurs in the freeze-concentrated state, after crystallization of glassy water to cubic ice. When using HBr, crystalline H212CO3(D212CO3, H213CO3), i.e.β-H2CO3, is immediately isolated at 200 K, after pumping off ice and excess HBr. When using HCl, amorphous H2CO3 is first isolated at 200 K and crystallizes to β-H2CO3 on heating to 220 K. Effects of protonating agent, base pressure and methanol treatment of a β-H2CO3 film are discussed with respect to the amorphous → crystalline H2CO3 phase transition. Sublimation of β-H2CO3 gives a deposit whose FTIR spectrum resembles that of α-H2CO3. Assignment for the spectral features of β-H2CO3 and the 2H and 13C isotopic forms is given and, based on comparison of the O—H stretching band regions, we conclude that hydrogen bonding is stronger in α-than in β-H2CO3." @default.
- W2085277363 created "2016-06-24" @default.
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- W2085277363 date "1996-01-01" @default.
- W2085277363 modified "2023-09-24" @default.
- W2085277363 title "Metastable intermediates from glassy solutions. Part 4.—FTIR spectra of β-carbonic acid and its<sup>2</sup>H and<sup>13</sup>C isotopic forms, isolated from aqueous solution" @default.
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- W2085277363 doi "https://doi.org/10.1039/ft9969203197" @default.
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