| UV–visible absorption | The Q-band absorption peak red-shifted and lost structure with increasing ring size, with the change saturating between 20 and 30 porphyrin units |
|---|---|
| Intensity-cycled fsTA, c-P6 | Third-order fitted time constants 0.15 ± 0.02, 360 ± 20, and 1480 ps; no resolvable two- or three-exciton contribution; average lifetime 480 ± 10 ps |
| Intensity-cycled fsTA, c-P10 | Third-order fitted time constants 0.4 ± 0.1, 650 ± 50, and 930 ps; EEA rate 5.9 ± 0.9 ps⁻⁰·⁵; f fixed at 2; average lifetime 580 ± 50 ps; calculated diffusion constant 30 ± 10 cm² s⁻¹ and diffusion length 130 ± 20 nm, both underestimated due to annihilation-limited EEA |
| Intensity-cycled fsTA, c-P20 | Third-order fitted time constants 4.9 ± 0.3, 290 ± 20, and 1240 ps; EEA rate 3.1 ± 0.1 ps⁻⁰·⁵; f 2.8 ± 0.2; average lifetime 490 ± 10 ps; calculated diffusion constant 17 ± 1 cm² s⁻¹ and diffusion length 92 ± 7 nm, both underestimated due to annihilation-limited EEA |
| Intensity-cycled fsTA, c-P30 | Third-order fitted time constants 10 ± 2, 420 ± 10, and 1180 ps; EEA rate 1.03 ± 0.03 ps⁻⁰·⁵; f 3.9 ± 0.3; average lifetime 520 ± 10 ps; calculated diffusion constant 2.9 ± 0.2 cm² s⁻¹ and diffusion length 39 ± 1 nm |
| Intensity-cycled fsTA, c-P40 | Third-order fitted time constants 20 ± 2, 290 ± 20, and 1240 ps; EEA rate 0.48 ± 0.03 ps⁻⁰·⁵; f 20 ± 10; average lifetime 440 ± 10 ps; calculated diffusion constant 0.85 ± 0.09 cm² s⁻¹ and diffusion length 19 ± 1 nm |
Erico M. Braun, Michael Jirasek, Harry L. Anderson, Stephen R. Meech, Ismael A. Heisler, Giovanni Bressan. “Single and multiexciton dynamics in porphyrin nanorings.” ChemRxiv (). https://doi.org/10.26434/chemrxiv.15007829/v1
Values presented only in UV–visible-absorption or femtosecond-transient-absorption plots or images were not transcribed