High-Resolution Fourier Transform Infrared Spectroscopy of Vinyl Alcohol: Rotational Analysis of the ν13 CH2 Wagging Fundamental at 817 cm−1

✍ Scribed by Duck-Lae Joo; A.J. Merer; Dennis J. Clouthier

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 142 KB
• Volume: 197
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1999.7877

✦ Synopsis

The first high-resolution infrared spectra of the unstable molecule vinyl alcohol are reported. The spectra have been obtained using a new precursor, 2-chloroethanol, which when pyrolyzed at 1050°C gives strong infrared spectra of vinyl alcohol free of interfering hydrocarbon absorption bands. In this work, we have analyzed the strong 13 fundamental at 817 cm Ϫ1 and substantially improved the ground state rotational constants by a simultaneous fitting of previous microwave data and a large number of infrared combination differences. The 13 1 upper state was found to be perturbed by the 15 2 "dark" state at 775.7 cm Ϫ1 , and a complete analysis of the perturbed rotational structure has been achieved using an interacting two-state model. Further small perturbations at high K a and J have been identified as interactions with the 10 and 12 fundamentals at 948 and 960 cm Ϫ1 , respectively.