Non-porous organic crystals and their interaction with guest molecules from the gas phase ...

• Main Authors: Casco, Mirian Elizabeth, Krupp, Felix, Grätz, Sven, Schwenger, Alexander, Damakoudi, Vassiliki, Richert, Clemens, Frey, Wolfgang, Borchardt, Lars
• Format: Article in Journal/Newspaper
• Language: English
• Published: Universität Stuttgart 2020
• Subjects: 540; Methane hydrate
• Online Access: https://dx.doi.org/10.18419/opus-13158; http://elib.uni-stuttgart.de/handle/11682/13177

Some organic molecules encapsulate solvents upon crystallization. One class of compounds that shows a high propensity to form such crystalline solvates are tetraaryladamantanes (TAAs). 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. The term ‘encapsulating organic crystals’ (EnOCs) has been coined for these species. In this work, we studied the behavior of three TAAs upon exposition to different guest molecules by means of sorption technique. 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. Uptake of methane beyond one molar equivalent was detected for wet crystals, even though the materials showed a lack of porosity. Thus far, such behavior, which we ascribe to methane hydrate formation, had been described for porous non-crystalline materials ... : Deutsche Forschungsgemeinschaft ...