Polymers containing coumarin and Ru(BpyMe2)3
2+ chromophores were synthesized using
a grafting approach and also a copolymerization approach. It was found that the solubility of polymers
made from Ru-containing monomers was higher than that observed for comparable polymers obtained
by grafting of Ru complexes onto bpy-containing prepolymers. The resulting bichromophoric macromolecules exhibited enhanced absorption and luminescence properties compared to the single Ru(BpyMe2)3
2+
complexes due to a very efficient (>95%) energy transfer between the coumarin donor dyes and the
ruthenium chromophores. In addition, a novel system in which two different donor dyes are present
together with the Ru complex was synthesized and also found to deliver efficient energy transfer to the
ruthenium complexes.
The synthesis of novel dendrimers functionalized with laser dyes both at the periphery and at the
core, along with all relevant model compounds necessary for accurate photophysical studies, is
described. The utilized synthetic strategy involves a modular approach in which a variety of
peripheral and core moieties can be placed on a dendritic structure bearing electrophilic peripheral
groups and a nucleophilic core. Specifically, the target macromolecules required functionalization
with the laser dyes coumarin 2 (periphery) and coumarin 343 (core) due to the possibility of energy
transfer from the former to the latter dye. In addition, the preparation of a novel, highly soluble
and reactive hypermonomer utilized in the rapid and efficient synthesis of high-generation dye-labeled dendrimers and model compounds is outlined.
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