FTIR - Studies Of Infrared-Laser Induced Photorotamerization Reactions In Low -Temperature Matrices

Otto Schrems

doi:10.1117/12.970811

20 December 1985 FTIR - Studies Of Infrared-Laser Induced Photorotamerization Reactions In Low -Temperature Matrices

Otto Schrems

Proceedings Volume 0553, Fourier and Computerized Infrared Spectroscopy; (1985) https://doi.org/10.1117/12.970811
Event: 1985 International Conference on Fourier and Computerized Infrared Spectroscopy, 1985, Ottawa, Canada

Abstract

IR-laser induced photorotamerizations of 2-fluoroethanol (FE) and of hydrogen-bonded alcohol dimers have been studied in low-temperature inert gas matrices by means of FTIR-spectroscopy. The interconversion processes of FE are complex in many matrices, e.g. solid argon, and show effects due to interconversion, photoorientation as well as effects caused by different trapping sites. In solid xenon, however, only the Gg' Tt isomerization takes place after excitation into the OH stretching band at 3610.5 cm-1 (Gg' isomer) as indicated by the depletion of the 3610.5 cm-1 band and simultaneous growing of the 3650.0 cm-1 absorption band (Tt isomer). This reaction is reversible with the back reaction Tt Gg t (excitation at 3650.0 cm -1 ) being about 5 times slower. IR-induced interconversions of hydrogen-bonded alcohol dimers isolated in cryogenic matrices have also been studied. For many alcohols voli dimer absorption (D2 ) bands have been observed with multiplet structure indicating several mutual positions of the two alcohol molecules relative to the 0 axis. The changes in band intensities observed after excitation into these D2 bands (3550 - 3400 cm range) establishes that interconversions of the dimers take place and that each D2 band corresponds to a particular dimer species with open chain structure.

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Otto Schrems "FTIR - Studies Of Infrared-Laser Induced Photorotamerization Reactions In Low -Temperature Matrices", Proc. SPIE 0553, Fourier and Computerized Infrared Spectroscopy, (20 December 1985); https://doi.org/10.1117/12.970811

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KEYWORDS

Solids

Matrices

Absorption

Molecules

Argon

FT-IR spectroscopy

Infrared spectroscopy

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