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Alternating, all‐ trans polyenynes: Model compounds for poly(diacetylene)s with defined conjugation length
Author(s) -
Giesa Reiner,
Schulz Rolf C.
Publication year - 1994
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1994.210330106
Subject(s) - diacetylene , extrapolation , raman spectroscopy , raman scattering , bond length , chain (unit) , chemistry , single bond , triple bond , materials science , analytical chemistry (journal) , polymer chemistry , double bond , polymer , physics , molecule , organic chemistry , optics , polymerization , mathematics , mathematical analysis , astronomy , alkyl
The syntheses of polyenynes as model compounds for poly(diacetylene)s (PDAs) are described. Variation of properties (UV–VIS, Raman, NMR and bond geometries) as a function of the chain length was investigated. After extrapolation to infinite chain length these data were compared to those for PDAs. From UV–VIS spectra a value of λ = 551 nm (2.25 eV) was calculated corresponding to the electronic transition of a single polyenyne chain. This energy is located at the low energy end of a yellow PDA solution spectrum. From Raman scattering v (CC) = 2108–2128 cm −1 and v (CC) = 1505–1532 cm −1 were calculated after extrapolation. Similarly sp‐C 13 C NMR data yielded a shift of δ = 100 ppm. These data are almost identical to data known for yellow PDA solutions. Bond geometries are almost identical to those of poly(diacetylene)s and theoretical data.