Our results show that TAA crystals have interesting properties beyond the formation of conventional solvates. Thus far, such behavior, which we ascribe to methane hydrate formation, had been described for porous non-crystalline materials or crystals with detectable porosity, not for non-porous organic crystals. Uptake of methane beyond one molar equivalent was detected for wet crystals, even though the materials showed a lack of porosity. We firstly measured the vapor adsorption/desorption isotherms with water, tetrahydrofuran and toluene, and secondly, we studied the uptake of methane on dry and wet TAAs. In this work, we studied the behavior of three TAAs upon exposition to different guest molecules by means of sorption technique. The term ‘encapsulating organic crystals’ (EnOCs) has been coined for these species. Recently, tetrakis(dialkoxyphenyl)-adamantanes have been shown to encapsulate a wide range of guest molecules in their crystals, and to stabilize the guest molecules against undesired reactions. One class of compounds that shows a high propensity to form such crystalline solvates are tetraaryladamantanes (TAAs). Some organic molecules encapsulate solvents upon crystallization.
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