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Reverse Saturable Absorption in the Near-Infrared by Fused Porphyrin Dimers


  • This work was supported by the EOARD and EPSRC (UK). We thank Dr. A. R. Cowley (Oxford) for help with X-ray crystallography and the EPSRC Mass Spectrometry Service (Swansea) for mass spectra.


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Bromine and iodine substituents increase the yield of triplet excited states in a triply linked fused porphyrin dimer (see Figure), resulting in efficient reverse saturable absorption in the near-infrared range at 600–970 nm on the nanosecond timescale.

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