Vibrational circular dichroism of matrix-isolated molecules

✍ Scribed by D.W. Schlosser; F. Devlin; K. Jalkanen; P.J. Stephens

• Publisher: Elsevier Science
• Year: 1982
• Tongue: English
• Weight: 396 KB
• Volume: 88
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(82)87089-9

✦ Synopsis

Vibrational circular dichroism (VCD) spectra are reported for (+), (-) and (-+) a-pinene, and (-) /3-pinene, isolated in argon matrices at ~18 K. These are the first observations of VCD of matrix-isolated molecules. Spectra are limited to the C-H stretching region (2800-3100 cm -1 ). In all cases, the VCD spectra are substantially more structured than the corresponding room-temperature spectra, as a result of much narrower linewidths. Further, VCD magnitudes are greater due to decreased cancellation of overlapping transitions with oppositely signed VCD. The largest anisotropy ratios observed are >5 × 10 -4 and are larger than any reported for room-temperature solutions of organic molecules. This technique will permit substantially more definitive evaluations of theoretical calculations of VCD.