The ring puckering vibrations in trimethylene oxide and trimethylene sulphide as studied by P.M.R. spectroscopy in a liquid crystalline medium |
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| Authors: | C.L. Khetrapal A.C. Kunwar A. Saupe |
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| Affiliation: | 1. Tata Institute of Fundamental Research , Bombay 5, India;2. Liquid Crystal Institute, Kent State University , Kent, Ohio, U.S.A. |
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| Abstract: | The P.M.R. spectra of trimethylene oxide and trimethylene sulphide dissolved in a nematic solvent have been investigated. The chemical shifts, the direct and the indirect spin-spin couplings were determined. The interpretation of the direct couplings in terms of the molecular structure shows that the ring skeleton of these molecules is not rigidly planar due to ring puckering vibrations. Mean amplitudes for the vibrations are estimated assuming fixed values for the bond distances and for the HCH bond angles. The results obtained are in good agreement with the earlier microwave studies. |
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