Crystalline inclusion compounds of new hydroxy hosts featuring a pentaaryl substituted cyclopentadienol framework

Crystal Inclusion Formation of a New Type of Dumbbell-Shaped Host Compound Featuring Two Bulky 2,3,4,5-Tetraphenylcyclopenta-2,4-dien-1-ol Terminal Groups Attached to a Linear Spacer Unit

“…In summary, compared to the known solvent inclusion of 1-aryl substituted 2,3,4,5-tetraphenylcyclopentadien-1-ols being simple monofunctional analogues, , the present structurally extended dumbbell-shaped host molecules 1 – 4 not only give rise to a more diversified inclusion property but also to unusually high stoichiometric ratios of the solvent included in the majority of isolated crystals as a specific feature. This in particular is likely to be beneficial for future host design aiming at the storage , or the sensing , of solvents by means of crystalline materials.…”

“…This is also a reason to see that the combination of bulky terminal groups and a narrow well-dimensioned spacer element enables interlocking of the molecules to form a closed packing structure with the solvent molecules either accommodated in closed lattice voids (3a) or creating a layer structure (4a). In summary, compared to the known solvent inclusion of 1-aryl substituted 2,3,4,5-tetraphenylcyclopentadien-1-ols being simple monofunctional analogues, 18,19 the present structurally extended dumbbell-shaped host molecules 1−4 not only give rise to a more diversified inclusion property but also to unusually high stoichiometric ratios of the solvent included in the majority of isolated crystals as a specific feature. This in particular is likely to be beneficial for future host design aiming at the storage 7,30 or the sensing 13,31 of solvents by means of crystalline materials.…”

“…In a more detailed specification, we describe the synthesis of the dumbbell-shaped host compounds 1 – 4 , including seven examples of corresponding solvent inclusions (Scheme ) and discuss the X-ray crystal structures of the inclusion complexes. A few known, in a way related, host compounds , containing the same bulky 2,3,4,5-tetraphenylcyclopenta-2,4-dien-1-ol moiety, but as a monofunctional species showing a more simple molecular constitution, are worth mentioning at this point and will be regarded in the discussion.…”