Cross-linked Polymers
with Exceptionally High Ru(bipy)<sub>3</sub><sup>2+</sup> Loadings
for Efficient Heterogeneous Photocatalysis
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Abstract
Phosphorescent cross-linked polymers <b>1</b> and <b>2</b> were synthesized via oxidative homocoupling reactions of
tetra(ethynyl)
derivatives of Ru(bpy)<sub>3</sub><sup>2+</sup> (with the alkynyl
groups located at 4,4′- or 5,5′- positions of two substituted
bipyridines). These cross-linked polymer particles contain exceptionally
high Ru(bpy)<sub>3</sub><sup>2+</sup> loadings and serve as highly
efficient and reusable heterogeneous photocatalysts for a range of
organic transformations, presumably owing to the ability of the Ru(bpy)<sub>3</sub><sup>2+</sup> moieties in the polymer network to transport
triplet excited states to particle surfaces to initiate the organic
reactions. This work illustrates the potential of developing photocatalytic
cross-linked polymers from photoactive molecular building blocks for
solar energy utilization