Excitation Energy Transfer and Exchange-Mediated Quartet State Formation in Porphyrin-Trityl Systems.

Chemistry : a European Journal
Oliver NoldenSabine Richert

Abstract

Photogenerated multi-spin systems hold great promise for a range of technological applications in various fields, including molecular spintronics and artificial photosynthesis. However, the further development of these applications, via targeted design of materials with specific magnetic properties, currently still suffers from a lack of understanding of the factors influencing the underlying excited state dynamics and mechanisms on a molecular level. In particular, systematic studies, making use of different techniques to obtain complementary information, are largely missing. This work investigates the photophysics and magnetic properties of a series of three covalently-linked porphyrin-trityl compounds, bridged by a phenyl spacer. By combining the results from femtosecond transient absorption and electron paramagnetic resonance spectroscopies, we determine the efficiencies of the competing excited state reaction pathways and characterise the magnetic properties of the individual spin states, formed by the interaction between the chromophore triplet and the stable radical. The differences observed for the three investigated compounds are rationalised in the context of available theoretical models and the implications of the re...Continue Reading

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Citations

Aug 19, 2020·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Kevin KoppNico Fleck
Feb 26, 2021·The Journal of Physical Chemistry Letters·Haochuan MaoMichael R Wasielewski
May 1, 2021·Journal of the American Chemical Society·Maximilian MayländerSabine Richert
Sep 18, 2021·Journal of the American Chemical Society·Samantha M Harvey, Michael R Wasielewski

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Methods Mentioned

BETA
electron paramagnetic resonance
NMR
light scattering

Software Mentioned

SO
ISC

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