Abstract
Marked differences between the fluorescence excitation spectra and absorption spectra of the chiral, soluble polydiacetylene, poly(9RMBU) (9RMBU = (CH 2) 9·OCO·NH·C*HPhMe) dissolved in chloroform, suggests the existence of discrete conjugation sequences within the polymer backbone. The highest quantum efficiencies originate from conjugation sequences of 5 and 6 repeat units with longer sequences quenched by a non-radiative deactivation mechanism. The use of poor solvents and photodegradation of the polymer sample also provides strong evidence for efficient energy migration along the polymer backbone. The data support an intramolecular fringed micelle model for the R-form of soluble polydiacetylenes in solution.
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