Berlin 2014 – scientific programme
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MO: Fachverband Molekülphysik
MO 23: Femtosecond Spectroscopy 3
MO 23.4: Talk
Friday, March 21, 2014, 14:45–15:00, BEBEL HS213
Photo induced electron transfer in a self formed aluminum corrole - viologen complex. — •Till Stensitzki1, Angelica Zacarias2, Zeeve Gross3, Atif Mahammed3, Yang Yang1, and Karsten Heyne1 — 1Department of Physics, Freie Universitaet Berlin, Berlin, Germany — 2Max-Planck-Institut fuer Mikrostrukturphysik and European Theoretical Spectroscopy Facility (ETSF), Germany — 3Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, Israel
Corroles are closed tetrapyroles simlar to porphyines, missing a C-atomat a meso position. Like porphyrines, they serve as a ligand for different metals. Furthermore, their photo-reaction is quite complex,violating Kashas-rule and showing complex and not fully understood excited state absorption.
Using polarization resolved femotosecond transient absorption and other spectroscopic methods, we show that sulfonated Al-corrole forms a complex with methyl-viologen. Upon formation of this complex, flourescence is quenched almost completely.
Analysis of the transient absorption spectra shows viologen-radical absorption and rapid loss of excited state population. This indicates ultrafast electron transfer dynamics.
For comparison we also investigated the dynamics of the corrole without methyl viologen, which exhibits fluorescence signals with a risetime of 10 ps. Our data provide information on various significant energy relaxation pathways in these type of molecules.