Columnar liquid-crystalline (LC) truxene derivatives containing branched flexible alkyl chains have been designed and synthesized. The dicyanomethylene and dithiafulvene substituents have been introduced into the π-conjugated truxene framework to tune their electronic and redox properties as well as the molecular assembled structures. The π-conjugated cores of dicyanomethylene-and dithiafulveneappended truxenes adopt bowl-shaped conformations, giving rise to a large intrinsic dipole moment perpendicular to the aromatic framework. These molemolecules form stable columnar LC structures through intermolecular dipoledipole interactions. The redox properties of LC truxene derivatives have been examined by cyclic voltammetry. The dicyanomethylene-appended truxene shows the reversible four-step electrochemical reductions, whereas the dithiafulveneappended truxene undergoes three-step oxidations.
All Science Journal Classification (ASJC) codes
- Organic Chemistry