| Abstract
| - The subtle flexibility of the framework material Co(bpy)1.5(NO3)2·(guest) (bpy = 4,4‘-bipyridine)(1·(guest)) is demonstrated quantitatively through in situ single-crystal X-ray diffraction measurements ofguest desorption and sorption processes. Variable temperature unit cell determinations were employed tomonitor the uptake and release of guest species, and full structural determinations have been carried outfor the as-grown ethanol-loaded framework (1·(EtOH)), for the empty host framework (1), and for each ofthe five introduced guests (methanol: 1·(MeOH), acetone: 1·(ACN), acetonitrile: 1·(MeCN), tetrahydrofuran:1·(THF), dichloromethane: 1·(DCM)). The framework consists of interdigitated two-dimensional bilayersof cobalt(II) centers bridged by bpy ligands, with one-dimensional pores that account for approximately20% of the total volume. The sorption of guest species of varying size and shape has revealed theframework's ability to adapt to different guests through a range of different framework flexibilities.
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