Chromatic transition of π-conjugated polydiacetylene and the subsequent aggregation phenomena

Hidetoshi Oikawa, Tatsumi Korenaga, Shuji Okada, Hachiro Nakanishi

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Static and dynamic light scattering from π-conjugated poly(4BCMU) in toluene solutions were measured at 353 K (yellow phase) and 323 K (red phase) to evaluate the hydrodynamic radius Rh and the fractal dimension D. It was suggested that poly(4BCMU) may exist not as an isolated worm-like chain but as a weakly interacted cluster-like domain in the yellow phase. The domain was considered to be elaborated by inter-molecular hydrogen bondings formed newly through a thermal break of intra-molecular hydrogen bondings between side chains along a main chain. On the other hand, the increases in Rh and D have revealed that poly(4BCMU) chains aggregated gradually in the red phase, after taking a single extended rod-like conformation. The subsequent aggregation seemed to be promoted not only by lowering a solvent quality but also by increasing the effective concentration, accompanied by the conformational transition.

Original languageEnglish
Pages (from-to)5993-6001
Number of pages9
Issue number22
Publication statusPublished - 1999 Oct


  • Chromatic transition
  • Dynamic light scattering
  • Polydiacetylene

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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