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10-Silacorroles Exhibiting Near-Infrared Absorption and Emission.

10-Silacorroles were obtained from the Pd-catalyzed silylative cyclization of a bis(α,α'-dibromodipyrrin) NiII precursor with dihydrosilanes. These 10-silacorroles show substantially red-shifted absorption bands relative to those of normal porphyrins and isocorroles. Notably, the corresponding free base and ZnII  10-silacorroles exhibit emissions in the NIR region. Theoretical calculations on these 10-silacorroles revealed the presence of σ*-π* conjugation between the silyl group and the tetrapyrrole π system, which significantly lowers their LUMO energy levels.

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