CHARACTERIZATION OF A MATRIX ISOLATED COMPLEX $KH^{+}X^{-}$(X = Cl or Br) BY ELECTRON SPIN RESONANCE
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Date
1975
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Publisher
Ohio State University
Abstract
Potassium atoms and hydrogen halides deposited in argon and krypton matrices react to yield a radical species whose spectral parameters are closely described in terms of an ionic product, $KH^{+}X^{-}$(X = Cl or Br). Such a structure corresponds to the short lived complex long postulated as an intermediate in the analagous gas phase reactions, M + HX (M = alkali). For $KH^{+}Cl^{-}$ and $KH^{+}Br^{-}$ in argon matrices, the measured spectral parameters are: $a_{H} = 432$ Gauss and $a_{K} = 19$ Gauss, with $g = 2.0112$. By comparison with ``free” hydrogen atoms ($a_{H} = 508$ gauss, $g = 2,0133$, for an argon matrix) the spin density on the proton in $KH^{+}$ is measured to be $\sim$85\%. These results, and some preliminary data from the analagous sodium and rubidium reactions, are discussed in terms of a plausible bonding scheme for complexes MHX.
Description
Author Institution: Department of Chemistry, Harvard University; Department of Chemistry, University of Washington