Construction of aromatic folding architecture: Utilization of ureylene and iminodicarbonyl linkers

Abstract

This review discusses the creation of aromatic folded structures in a zigzag way in crystalline state. A Pillar-Like columnar array of aromatic rings by folding can be constructed by using U-Shaped linkers to connect the aromatic rings. As such linkers, ureylene and iminodicarbonyl groups have been utilized. Physical and spectroscopic properties of aromatic foldamers created in this fashion are affected considerably with increasing numbers of aromatic rings involved. To create folding networks by hydrogen bonding in crystal structures, U-shaped urea building blocks were developed. A variety of folded structures have been generated in the cocrystals by hydrogen bonding between the building blocks and hydrogenbonding acceptor molecules. Interesting examples of stacked zigzag Ribbon-Type aromatic folding architectures are also presented.