THE FAR INFRARED SPECTRA OF $\alpha-QUINOL$ AND HCL: $\beta-QUINOL CLATHRATE^{\ast}$
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Date
1964
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Ohio State University
Abstract
When hydroquinone, $C_{5}H_{4}(OH)_{2}$, is formed in the presence of a sufficient number of small molecules such as HCl, the $\beta-quinol$ structure is $formed.^{1}$ The structure is characterized by cages in which a single HCl molecule is trapped. If no trappable molecules are present, the $\alpha-quinol$ structure is formed. Preliminary results have been obtained from a far infrared $(10-100 cm^{-1})$ study of these inclusion compounds. Spectra were obtained using a lamellar grating modulated interferometer with a cooled carbon bolometer detector. The absorption spectrum of $\alpha$-quinol at $1.2^{\circ}K$ reveals 18 sharp lattice lines $(\Delta_{\nu} \leq cm^{-1})$. The spectra of HCl: $\beta-quinol$ with 75 per cent of the cages filled measured at $1.2^{\circ}K, 40^{\circ}K$ and $120^{\circ}K$ indicate three broad $(\Delta \nu \sim 4 cm^{-1})$ temperature dependent absorptions. Attempts are being made to interpret the HCl: $\beta-quinol$ spectra in terms of a hindered rotor interacting with the normal modes of the quinol lattice and neighboring trapped molecules.
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$^{\ast}$ Work supported by the Air Force Office of Scientific Research, contract AF 49 (638)-1334. $^{1}$ D. E. Palin and H. M. Powell, J. Chem. Soc. 208 (1947).
Author Institution: Laboratory for Insulation Research, Massachusetts Institute of Technology
Author Institution: Laboratory for Insulation Research, Massachusetts Institute of Technology