The art of stacking: structural folding and self-assembly of branched π-conjugation assisted by O-H… O and C-H… F hydrogen bonds

摘要

An intimate interplay of O-H… O/C-H… F hydrogen bonds and π-π stacking interactions allows a phenyleneethynylene-based dendritic molecule to fold and self-assemble into two distinctively different molecular crystals as pseudopolymorphs. Polymorphism describes the ability of molecules to adopt more than one structure in the solid state. When polymorphs occur with variations in solvent contents in the unit cell, the term pseudopolymorphism is used. A practical importance of this phenomenon has been recognised in the field of pharma-ceuticals since (pseudo)polymorphs often display different physicochemical properties.