Dissymmetric Chiral Poly(diphenylacetylene)s: Secondary Structure Elucidation and Dynamic Luminescence

Abstract The secondary structure of a dissymmetric and chiral poly(diphenylacetylene) (PDPA) is elucidated by combining the data from NMR experiments (regioregular head to tail structure), Raman IR studies ( E configuration polyene double bonds), high‐resolution AFM images (helical pitch, packing angle orientation external helix). As result, an E‐transoidal backbone describing three coaxial helices obtained. Theoretical electronic circular dichroism (ECD) show good correspondence between experimental theoretical allow one decipher that first Cotton band generated core not only backbone. dynamic behavior poly‐( S )‐ 2 also demonstrated helix inversion effect produced conformational changes at pendant groups when annealed in solvents with different donor abilities. This phenomenon accompanied polarized luminescence PDPA (CPL switch).