Synthesis and Properties of Novel Optically Active Platinum-containing Poly(phenyleneethynylene)s

The dehydrochlorination coupling polymerization of N-(3,5-diethynylbenzoyl)-l-alanine dodecylamide 1 with platinum (Pt) chlorides having pyridine, bipyridine, and phenanthroline ligands 2a–2d gave novel optically active poly(phenyleneethynylene)s [poly(1-2a)–poly(1-2d)] bearing Pt in the main chains. The Z-average diameters of the polymers ranged from 453 to 1081 nm. Poly(1-2a) exhibited CD signals assignable to aggregates, and formed regulated twisted structures with height of 540 ± 70 nm and pitch of 62 ± 6 nm, which were confirmed by AFM measurements.