Spectroscopic studies of oligodiacetylenes in solution and polymer film.
The photophysical properties of a series of monomeric, dimeric and trimeric oligodiacetylenes (ODAs; oligoenynes) bearing trimethylsilyl, t-butyl and n-octyl end-capping substituents were studied in solution and in a polymer film. Emission studies show a significant emission of oligodiacetylenes in solution, which increased with increased conjugation. This is remarkable given the near absence of fluorescence in oligoenes of similar length (e.g. hexatriene) and polydiacetylenes (PDAs), which constitute the conjugation limit. A large Stokes shift was observed, and shown to originate from an energy difference between the Franck-Condon excited state and the fluorescent state. From near-identical angles obtained for the absorption and emission dipoles it was concluded that the overall geometry of ODAs does not significantly change upon electronic transition.
Laboratory of Organic Chemistry, Wageningen University, Dreijenplein 8, 6703 HB Wageningen, The Netherlands.
Cindy C J
CC
Hendrikx
Michael
M
Polhuis
Annemiek
A
Pul-Hootsen
Rob B M
RB
Koehorst
Arie
A
van Hoek
Han
H
Zuilhof
Ernst J R
EJ
Sudhölter
D000042:Absorption; D006586:Hexanes / Q000737:chemistry; D000078789:Polyacetylene Polymer; D011108:Polymers / Q000737:chemistry*; D053279:Polyynes / Q000737:chemistry*; D012996:Solutions; D013050:Spectrometry, Fluorescence; D013053:Spectrophotometry; D013057:Spectrum Analysis
D006586:Hexanes; D000078789:Polyacetylene Polymer; D011108:Polymers; D012996:Solutions; D053279:Polyynes; C082361:polydiacetylene