Abstract
IR and Raman spectra have been measured for taurine (2-aminoethanesulfonic acid) and its sodium salt in the solid state and Raman spectra for aqueous solutions of taurine with different pH values. Normal coordinate treatment has been carried out. The analysis of the spectra has indicated that, in the solid state, the molecule of taurine takes the gauche form while that of the sodium salt takes the trans form, and that the trans and gauche forms coexist in both acidic and basic aqueous solutions. The CS stretching bands for the gauche and trans forms were observed at 742 cm −1 and 803 cm −1 respectively. These bands were applied to a conformational analysis of other compounds containing a taurine skeleton; sodium taurocholate takes the gauche conformation about the bond axis NCCS.
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