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Published October 31, 1990 | metadata_only
Journal Article

Infrared spectra of butenyl anions: multiphoton electron detachment as a photochemical probe of isomeric structures of gas phase anions


The techniques of ion cyclotron resonance spectroscopy have been used to examine IR multiphoton electron detachment reactions of C_4H−_7 structural isomers and stereoisomers. Anions are trapped at low pressure for up to several seconds during irradiation with the unfocused output of a line-tunable continuous wave CO_2 laser. By examining photodetachment yields as a function of laser wavelength and irradiation period it is possible to distinguish three different isomers. Deprotonation of cis-2-butene by NH−_2 and H− forms exclusively the cis-1-methylallyl anion whereas deprotonation of trans-2-butene or 1-butene yields a mixture of the cis and trans anions. The third isomer, 2-methylallyl anion, results from deprotonation of 2-methylpropene. IR multiphoton electron detachment spectra in the 10 μm region are presented for these anions and isomeric mixtures.

Additional Information

© 1990 Published by Elsevier B.V. Received 13 March 1990. We thank D. Duan for checking the purity of our butene samples by vapor phase chromatography. These studies were supported in part by the President's Fund of the California Institute of Technology, the U.S. Department of Energy and the National Science Foundation (Grant No. CHE 87-11567).

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August 19, 2023
August 19, 2023