Brilliant BODIPYFluorene Copolymers with Dispersed Absorption and Emission Maxima

Arelatively new field of interest in the chemistry of BODIPY(4,4-difluoro-4-bora-3a,4a-diaza-s-indacene) dyes13 is to polymerize them to concentrate multiple fluor units in single molecules47 and hence to form bright particles for materials or for imaging biological systems. Polymers of this kind tend to have desirable properties for those applications because they concentrate several fluorescent groups in one molecule. Brightness-per-fluorophore in homopolymeric dye systems is not necessarily greater than that for the free dye, and scope for manipulation of spectroscopic properties is limited; consequently it is logical to research similar polymers from two or more components. This strategy allows donor fragments that absorb light of a desirable wavelength to collect and transfer energy to fluor-ophores that fluoresce. In this paradigm, donor:acceptor ratios may be adjusted to optimize the brightness-per-fluorophore (note brightness-per-fluorophore = absorption cross-sectio