High-intensity vibrations in poly-para-phenylene chain: experiment and model

Valerii M. Kobryanskii

doi:10.1117/12.429380

15 June 2001 High-intensity vibrations in poly-para-phenylene chain: experiment and model

Valerii M. Kobryanskii

Proceedings Volume 4279, Organic Photonic Materials and Devices III; (2001) https://doi.org/10.1117/12.429380
Event: Symposium on Integrated Optics, 2001, San Jose, CA, United States

Abstract

It has been demonstrated that in IR spectra of vacuum- deposited poly-para-phenylene (PPP) film an extremely strong band at 1375 cm^-1 is observed, which is not typical of currently known PPP modifications. High intensity of the band at 1375 cm^-1 was associated with the change in the bond order of the 'defect' C-C bond between adjacent quinoid and benzenoid units. Mechanism of quinoid fragments formation in process of PPP film grows is here suggested. The p- phenylene radicals generated during thermal destruction of PPP powder are extremely active. However, when they appear included in the solid phase, they lose much of their initial reactivity, and recombination may be kinetically hindered. In this case, the macromolecules with 'stuck' terminal phenyl radicals could form. The vacuum-deposited poly-para-phenylene solid phase exhibits high crystallinity. Therefore, the recombination of 'stuck' radicals can be essentially hampered. In this case the isomerization of 'stuck' radicals gives delocalized defects. The possibility of practical applications of vacuum-deposited PPP films with delocalized defects is discussed.

Citation Download Citation

Valerii M. Kobryanskii "High-intensity vibrations in poly-para-phenylene chain: experiment and model", Proc. SPIE 4279, Organic Photonic Materials and Devices III, (15 June 2001); https://doi.org/10.1117/12.429380

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