Engineering supramolecular organic frameworks (SOFs) of C-alkylpyrogallol[4]arene with bipyridine-based spacers.

Supramolecular organic frameworks (SOFs) based on pyrogallol[4]arene and 4,4'-bipyridine-type spacer molecules have been investigated. The hydrogen bonding pattern and molecular arrangement in the crystal structures are engineered through the cocrystallization approach. The length of the spacer molecules and the C-alkyl tail length of the PgC macrocycle are tuned to influence the hydrogen bonding pattern and thus the overall architecture of the resultant SOFs. Combined solid-state thermal analysis and solution-phase (1)H NMR results indicate the amount of solvent loss and the stability of the SOFs in solution.