Molecular symmetry determines the mechanism of a very efficient ultrafast excitation-to-heat conversion in Ni-substituted chlorophylls
- Pilch, Mariusz
- Dudkowiak, Alina
- Jurzyk, Barbara
- Łukasiewicz, Jędrzej
- Susz, Anna
- Stochel, Grażyna
- Fiedor, Leszek
DOIAbstract
AbstractIn the Ni-substituted chlorophylls, an ultrafast (<60fs) deactivation channel is created, which is not present in Ni-porphyrins. This observation prompted us to investigate in detail the mechanism of excitation-to-heat conversion in Ni-substituted chlorophylls, experimentally, using time-resolved laser-induced optoacoustic spectroscopy, and theoretically, using group theory approach. The Ni-substituted chlorophylls show exceptional photostability and the optoacoustic measurements confirm the prompt and very efficient (100%) excitation-into-heat conversion in these complexes. Considering their excellent spectral properties and the loss-free excitation-into-heat conversion they are likely to become a new class of versatile photocalori...
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