Metallosupramolecular Side-Chain Polymers and Polyelectrolyte- Metallosupramolecular Surfactant Complexes

摘要

Metal coordination has been exploited extensively in supramolecular chemistry, and the creation of supramo-lecular polymeric materials via metal-ligand bonds is an active area of research. Side-chain type supramolecular polymers are of interest because of the ability of these materials to form liquid-crystalline morphologies, with instances of such materials being created via hydrogen bonding, ionic bonding, metal complexation, and combinations thereof. Indeed, the pace of research on polymers with side-chains attached by metal coordination is accelera- ting. In 2005, several of us published the syntheses of metallosupramolecular polymers (MSPs) bearing alkyl-chain decorated dendrons attached to main chains via a terpyridine-Ru-terpyridine (Ru(tpy)2) complexation strategy. More recently, Aamer and Tew reported the synthesis and morphological characterization of two very similar MSPs, also based on polymers bearing pendant tpy groups. The first, in which the polymer was complexed with a simple terpyridine group, showed no mesomorphic structure, whereas the second, in which a C16 alkyl tail was attached to the su-pramolecularly bound terpyridine group, was shown to self-organize into a hexagonal columnar morphology, with some crystallization occurring between the C16 tails. This latter material was also shown to display nematic lyotropic behavior in concentrated solution.