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Molecules 2017, 22(7), 1174; doi:10.3390/molecules22071174

Ultrafast Dynamics of Sb-Corroles: A Combined Vis-Pump Supercontinuum Probe and Broadband Fluorescence Up-Conversion Study

1
Department of Physics, Free University Berlin, Arnimallee 14, D-14195 Berlin, Germany
2
Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, D-12489 Berlin, Germany
3
Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
4
Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa 3200008, Israel
*
Author to whom correspondence should be addressed.
Received: 31 May 2017 / Revised: 1 July 2017 / Accepted: 10 July 2017 / Published: 13 July 2017
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Abstract

Corroles are a developing class of tetrapyrrole-based molecules with significant chemical potential and relatively unexplored photophysical properties. We combined femtosecond broadband fluorescence up-conversion and fs broadband Vis-pump Vis-probe spectroscopy to comprehensively characterize the photoreaction of 5,10,15-tris-pentafluorophenyl-corrolato-antimony(V)-trans-difluoride (Sb-tpfc-F2). Upon fs Soret band excitation at ~400 nm, the energy relaxed almost completely to Q band electronic excited states with a time constant of 500 ± 100 fs; this is evident from the decay of Soret band fluorescence at around 430 nm and the rise time of Q band fluorescence, as well as from Q band stimulated emission signals at 600 and 650 nm with the same time constant. Relaxation processes on a time scale of 10 and 20 ps were observed in the fluorescence and absorption signals. Triplet formation showed a time constant of 400 ps, with an intersystem crossing yield from the Q band to the triplet manifold of between 95% and 99%. This efficient triplet formation is due to the spin-orbit coupling of the antimony ion. View Full-Text
Keywords: photoreaction; triplet formation; femtosecond spectroscopy; fluorescence up-conversion; corrole dynamics; tetrapyrrole; ultrafast relaxation; intersystem crossing photoreaction; triplet formation; femtosecond spectroscopy; fluorescence up-conversion; corrole dynamics; tetrapyrrole; ultrafast relaxation; intersystem crossing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zahn, C.; Stensitzki, T.; Gerecke, M.; Berg, A.; Mahammed, A.; Gross, Z.; Heyne, K. Ultrafast Dynamics of Sb-Corroles: A Combined Vis-Pump Supercontinuum Probe and Broadband Fluorescence Up-Conversion Study. Molecules 2017, 22, 1174.

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