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• W3128149194 endingPage "119551" @default.
• W3128149194 startingPage "119551" @default.
• W3128149194 abstract "The infrared spectra of the long-chain perfluorocarboxylic acid monohydrates differ markedly from those of the anhydrous dimers. Consequently, the structure of the solid perfluorocarboxylic acid monohydrates must differ from any known dimer-containing carboxylic acid crystals. Consideration of the significant features of the infrared spectra of the long-chain perfluorocarboxylic acid monohydrates, supplemented by their Raman spectra, and comparison with the spectra of auxiliary substances have led us to conclude that the rather strong neutral carboxyl-hydroxyl to water bonding can best explain the observations. The infrared spectra indicate the presence of fairly short hydrogen bonds connecting the water molecules to the carbonyl groups. In the construction of the hydrogen bonding pattern of the perfluorocarboxylic acid monohydrates, the oxalic acid dihydrate plays the key role. The striking similarity between the infrared spectra of the oxalic acid dihydrates and the perfluorocarboxylic acid monohydrates in the regions characteristic of water and OH⋯O vibration suggests that the structure of the hydrated carboxyl groups is the same in both crystals. These regions are characterized by the sharp doublet at 3539 cm−1 and 3464 cm−1, which is due to the H2O ν1 and ν3 stretching vibrations, respectively, and the broad absorption between 3000 cm−1 and 1500 cm−1 with the intense band at 1970 cm−1, both associated with the vibration of the OH⋯O group. The later peak consists of two band components at near 1980 cm−1 and 2020 cm−1. These band components show different behaviour when the temperature, polarization or deuteration is changed. In general, the infrared spectra of long-chain perfluorocarboxylic acids represent the system with very short hydrogen bonds connecting the water molecules to the carboxylates. This hydrogen bond pattern should be very similar to that found in the crystals of α-oxalic acid dihydrate." @default.
• W3128149194 created "2021-02-15" @default.
• W3128149194 creator A5027480921 @default.
• W3128149194 creator A5073165908 @default.
• W3128149194 date "2021-05-01" @default.
• W3128149194 modified "2023-09-26" @default.
• W3128149194 title "Infrared spectra of hydrogen bond network in lamellar perfluorocarboxylic acid monohydrates" @default.
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• W3128149194 doi "https://doi.org/10.1016/j.saa.2021.119551" @default.
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