Overtone spectra of 2-mercaptoethanol and 1,2-ethanedithiol |
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Authors: | Miller Benjamin J Yekutiel Mivsam Sodergren A Helena Howard Daryl L Dunn Meghan E Vaida Veronica Kjaergaard Henrik G |
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Institution: | Department of Chemistry, University of Otago, P.O. Box 56, Dunedin, New Zealand. |
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Abstract: | Vibrational spectra of vapor-phase 1,2-ethanedithiol and 2-mercaptoethanol were recorded to investigate weak intramolecular interactions. The spectra were recorded with conventional absorption spectroscopy and laser photoacoustic spectroscopy in the 2000-11,000 cm(-1) region. The room temperature spectra of each molecule are complicated by contributions from several conformers. Anharmonic oscillator local-mode calculations of the OH- and SH-stretching transitions have been performed to facilitate assignment of the different conformers in the spectra. We observe evidence of hydrogen-bond-like interactions from OH to S, but not from SH to O or S. The OH to S intramolecular interaction in 2-mercaptoethanol is weak and comparable to that found in the OH to O interaction in ethylene glycol. |
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