INFRARED SPECTRA OF THE RADICAL ANION AND THE DIANION OF $CO_{2}$ IN INERT GAS MATRICES
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Date
1982
Journal Title
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Publisher
Ohio State University
Abstract
Both the anion and dianion of $CO_{2}$ are formed upon cocondensation of one of the alkali metal atoms (Li, K or Cs) and carbon dioxide in excess inert gas matrices. All three intra-ionic infrared active modes of CO3 have been identified. Isotopic studies of enriched carbon-13 and oxygen-18, $CO_{2}$, have been carried out in order to determine the structure of the radical anion, $CO^{-}_{2}$. The effect of the size and the electropositivity of the metal atom on the $CO^{-}_{2}$ angle is studied. Reaction of alkali metal molecules and/or two alkali metal atoms with $CO_{2}$ result in the formation of $M^{+}{_{2}CO^{-}_{2}}$ (where M = Li, K or Cs). Band assignment have been made for the three fundamentals of the dianion, $CO_{2}$. Normal coordinate analyses have been carried out using all the measured frequencies for the various isotopomers of $CO^{-}_{2}$ and $CO^{=}_{2}$.