Abstract
Controlled rate thermogravimetry was applied to the several crystalline inclusion complexes of cholic acid with 2-, 3- and 4-fluorobenzyl alcohol. The purpose of this was to investigate the previous experimental results of these complexes using conventional thermogravimetry which indicated that the weight loss was rather more than the theoretical prediction based on a host-guest ratio elucidated by X-ray crystallography. The results, together with X-ray measurements, indicate that this “excess” weight loss results from the adsorption of the fluorobenzyl alcohols on the crystal surfaces. Further examination of these results revealed the substance release mechanism: the adsorbed molecules are first released, followed by the release of the included guests when the crystals were heated. These phenomena may be attributed to the properties of the CH 2OH group in the fluorobenzyl alcohols.
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