INFRARED MATRIX ISOLATION STUDIES OF TEH 1:1 MOLECULAR COMPLEXES OF THE HYDROGEN HAL IDES, AND CIF WITH 18-CROWN-6 AND RELATED CYCLIC POLYETHERS
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Date
1988
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Ohio State University
Abstract
Twin jet deposition has been employed with conventional matrix isolation for the study of isolated complexes of crown ethers with small neutral guests. For each system, from 1,4 dioxane to 18-crown-6, a single 1:1 complex was isolated. The dominant spectral feature of the complex was the stretching mode of the diatomic acid, shifted to lower energies from the parent position. For example, the complex of HF with 18-crown-6 absorbs at $3290 cm^{-1}$, while the complex of CIF with 18-crown-6 absorbs at about $665 cm^{-1}$. In addition, considerable broadening of the absorption was noted, compared to complexes of these acids with single-oxygen donors. The shifts observed here are quite similar to those observed for single 0-atom donors, suggesting that the cooperativity observed for crown ether complexes of metal cations is not important for the current complexes.
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Author Institution: Department of Chemistry, University of Cincinnati