Quinol methanol clathrate

Matsuo, T. Suga, H. Seki, S. A phase transition and dielectric absorption in the quinol methanol clathrate compound. J. Phys. Soc. Jpn. 1967, 22, 677. 

Figure 2. The Raman spectra of (a) the quinol methanol clathrate (b) 3-quinol and (c) the difference spectrum.

C19H22OS 0.2222 C8H16, 4-p-Hydroxyphenyl-2,2,4,8-tetramethylthia-chroman cyclooctane clathrate, 45B, 688 Ci9H2207f Quinol - methanol, 11, 649... 

Hydroquinone, p-C6H4(OH)2, also known as quinol in the older literature) exists in three polymorphic forms (or crystalline modifications). a-Hydroquinone is the stable form at room temperature, whereas the metastable monoclinic y-form can be prepared by sublimation or rapid evaporation of a solution in ether. Crystallization of hydroquinone from a common solvent such as methanol generally yields a clathrate with guest solvent inolecules trapped inside cavities of the (3-hydroquinone host lattice.". The existence of the (3 polymorph of hydroquinone (empty P-hydroquinone clathrate), which can be obtained by crystallization from n-octane, was reported in 1981. Described in this article are the structural features of these compounds, and some recent developments are also covered. 

The Raman spectra of quinol clathrates unlike the infrared spectra [4], are not dominated in the 2700-3700 cm" region by the OH band of the host lattice. It is consequently quite easy to observe the methanol guest molecule bands in the Raman spectrum of the clathrate (Fig. 2a), and the difference spectrum (Fig 2c) merely highlights the intensity of the guest molecule bands. 

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