Clathrate and inclusion compounds. Part III. The infrared and Raman spectra of some β-quinol (hydroquinone) clathrates

Abstract

The i.r. (4000–200 cm^–1) and Raman (3200–50cm^–1) spectra of the β-quinol clathrates containing the following guest molecules are reported: Ar, COS, CH₃Cl, CH₃Br, CH₃NC, CH₃SH, CH₄, C₂H₆, and C₂H₄. The preparations of the COS, CH₃NC, and CH₃SH clathrates have not been reported previously. The Raman spectrum of the CH₃NC guest molecule has been interpreted as indicating the loss of the rotational freedom of the guest molecule around the C₃ axis. The ν(C–Br) mode of the CH₃Br guest molecule gives rise to a Raman band which has a value 9 cm^–1higher than the corresponding gas-phase value. This has been interpreted as indicating a compression of the C–Br bond. An interesting correlation has been observed between the size of the guest molecule (and hence the extent of the distortion of the host lattice) and the splitting pattern of the host-lattice Raman bands in the 400–550 cm^–1 region.