INFRARED SPECTRAL STUDIES OF TRAPPED FREE RADICALS.
Final technical rept. 1 Dec 64-30 Nov 65,
SOUTH CAROLINA UNIV COLUMBIA DEPT OF CHEMISTRY
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The purpose of this research was to produce, by photolysis, sufficient quantities of the acetonitrile free radical CH2CN and to obtain its infrared spectrum. Production of the free radical was attempted by photolysis of solid iodoacetonitrile ICH2CN and acetonitrile CH3CN as host lattices at liquid nitrogen temperatures. Although the radical, CH2CN, was undoubtedly produced, sufficient quantities at liquid nitrogen temperatures could not be retained and detection of the infrared spectrum of the radical was not possible. Acetonitrile and iodoacetonitrile were then placed in Argon matrices at 20 K and photolysis was again attempted using an H-100-A4 mercury lamp. No change in the infrared spectrum of iodoacetonitrile was noted even after two hours of continuous radiation. It is concluded that the recombination of the radicals is too fast to permit a noticeable change in the infrared spectrum. Radiation for approximately one-half hour of the acetonitrile in a mole ratio of 200 to 1 in Argon also produced no detectable change in the infrared spectrum. However, radiation of the same matrix for periods of 2 12 hours decreased the intensity of the CH stretching vibrations as well as the intensity of the CN stretching vibration. In the remaining part of the spectrum the band intensities and positions remained essentially unchanged even after 2 12 hours of radiation.
- Inorganic Chemistry
- Atomic and Molecular Physics and Spectroscopy