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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster Session I

CPP 15.10: Poster

Montag, 17. März 2025, 19:00–21:00, P4

Charge separation in a porphyrin-based metal-organic framework incorporating fullerene — •Martin Richter¹, Xiaojing Liu², Pavel Kolesnichenko¹, Christof Wöll², and Petra Tegeder¹ — ¹Physikalisch-Chemisches Institut, Universität Heidelberg, Germany — ²Institut für Funktionelle Grenzflächen, Karlsruher Institut für Technologie, Germany

Porphyrin-based materials are attracting great interest due to their wide range of potential applications. They can be embedded into metal-organic frameworks (MOF) to manipulate and investigate the relations between function and structure. In conjunction with an electron acceptor, charge separation can be achieved, which is beneficial for applications such as solar cells or photocatalysis. Experiments on ZnTPP (Zinc 5,15-bis-(3,4,5-trimethoxyphenyl)-10,20-bis-(4-carboxyphenyl)) in a surface-anchored MOF (SURMOF) with fullerene C60 loaded into the pores, have demonstrated that photoexcitation can enhance the conductivity by up to two orders of magnitude [1]. Here, we investigate excited states dynamics after optical excitation with transient absorption spectroscopy on the femto- to nanosecond time scale. Charge separated states can be identified, which have a lifetime of 212-360 ps. The charge separation occurs after excitation of both the Soret band and the Q band within only a few hundred femtoseconds.

References

[1] X. Liu et al., Angew. Chem. Int. Ed. 2019, 58, 9590.

Keywords: charge separation; porphyrin; fullerene; SURMOF; transient absorption