Conjugated Ionic Polyacetylenes Spontaneous Polymerization of 2-Ethynyl Pyridinein a Strong Acid

摘要

The spontaneous polymerization of the acetylenic bond in 2-ethynylpyridine inconcentrated hydrochloric acid resulted in a substituted, extensively conjugated ionic polyacetylene bearing protonated pyridinim side groups. The backbone conjugation for the polymer was much greater than those obtained by a spontaneous processes via a Menschutkin reaction and by complexation with bromine. Base catalyzed deprotonation of the polymer resulted in a substantial decrease in backbone conjugation. The physical and spectral data prior to and after deprotonation correlate well with theoretical calculation and provides insight regarding its structural and conformational characteristics. Polymers, Polvacetylenes, Conjugated SemiConducting Systems, Ionogenic Polymers.