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- W2950853231 abstract "The extent of π electron delocalization in solid‐state polymerized diacetylenes is derived from observed Raman vibrational frequencies. Raman intense C=C and C≡C vibrations indicate that the polymer backbone is best represented by (=C–C≡C–C=)n. However, vC=C is linearly correlated with vC≡C over a wide frequency range and both frequencies increase with decreasing phase perfection. This suggests a significant fractional contribution δ from the mesomeric structure (–C=C=C=C–)n, which decreases the π bond order of C=C to 1‐δ and C≡C to 2‐δ. Both vC=C and vC≡C are calculated as a function of δ and compared with observed frequencies for variously substituted polydiacetylenes in different physical states. Resulting ΔvC=C/ΔvC≡C values obtained using two different bond‐length to bond‐order approximations are in good agreement with the observed value (1.19±0.12)." @default.
- W2950853231 created "2019-06-27" @default.
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- W2950853231 date "1974-10-08" @default.
- W2950853231 modified "2023-09-25" @default.
- W2950853231 title "ChemInform Abstract: RAMAN SPECTRAL SHIFTS RELEVANT TO ELECTRON DELOCALIZATION IN POLYDIACETYLENES" @default.
- W2950853231 cites W1977525658 @default.
- W2950853231 doi "https://doi.org/10.1002/chin.197440102" @default.
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