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.