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The authors thank A. Thomas, P. F. McMillan, E. Kroke and B. V. Lotsch for illuminating discussions. M.J.B. thanks the Czech Science Foundation (GA CR) for junior grant funding (CAMs–16-21151Y) and the European Research Council (ERC) for funding under the Starting Grant scheme (BEGMAT–678462). X.C.W thanks the National Basic Research Program of China (2013CB632405), the National Natural Science Foundation of China (21425309) and the 111 Project for financial support. C.M. thanks the Deutsche Forschungsgemeinschaft (Grant No. ME 4387/1-1).
Department of Chemistry, University of Munich (LMU), Butenandtstrasse 5-13, 81377 Munich, Germany.
State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350002, China.
Charles University in Prague, Faculty of Science, Department of Organic Chemistry, Hlavova 8, 128 43 Prague 2, Czech Republic.
Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany.
Institute of Organic Chemistry and Biochemistry ASCR V.V.I., Flemingovo nám. 2, 166 10 Prague 6, Czech Republic.
Correspondence to Michael J. Bojdys.

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