Formation of quinoid fragments in vacuum-deposited poly-para-phenylene films: IR spectroscopy evidence
✍ Scribed by V. M. Kobryanskii; S. L. Kotova
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 194 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0887-624X
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✦ Synopsis
The structure of vacuum-deposited poly-para-phenylene (PPP) films prepared from a high-molecular-weight PPP powder has been investigated by IR spectroscopy. It has been demonstrated that in IR spectra of PPP films exhibiting intense luminescence an extremely strong band at 1375 cm 01 is observed, which is not typical for currently known PPP modifications. Based on the IR spectral data, the model of formation of a PPP chain with quinoid fragments in the ground electronic state is proposed. The structure of defects that inevitably spring up during the benzenoidquinoid transition is discussed. High intensity of the band at 1375 cm 01 is associated with the change in the order of the ''defect'' C{C bond between adjacent quinoid and benzenoid units.