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Molecular Design of Blue-luminescent Dendritic Rods

2 MOLECULAR DESIGN OF BLUE-LUMINESCENT DENDRITIC RODS [Pg.429]

In THF at 20°C, dendritic monomers 3a-3c show absorption bands at 335 and 278 nm, due to the focal 1,4-diethynylbenzene unit and the dendritic wedges, respectively. On the other hand, dendritic macromolecular rods 2a-2c display a strong absorption band in the visible region (400-460 nm), characteristic of an extended electronic conjugation in the backbone. Upon excitation of the conjugated backbone at 425 nm in THF (abs425 nm = 0.01) at 20°C, 2a-2c show a strong blue fluorescence at 454 nm, where the quantum yield ( FL) has been evaluated to be virtually 100%. Of much interest is the fact that the fl FL value of 2c stays at nearly 100%, even when the solution is concentrated until the [Pg.429]




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