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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 re
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