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The protonation of a heterocyclic rigid‐rod polymer poly(p‐phenylene benzbisthiazole) and its model compound has been studied by UV‐visible and Raman spectroscopy. Because of the two nitrogens on the heterocyclic ring, spectroscopic features of unprotonated, half‐protonated, and fully protonated structures have been identified. For the fully protonated molecule, there is also an increase in conjugation between the phenyl ring and the heterocyclic ring.
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Shen et al. (1982) studied this question.
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