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Except where otherwise noted, this item's license is described as © The Royal Society of Chemistry 2020 This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Material from this article can be used in other publications provided that the correct acknowledgement is given with the reproduced material. Reproduced material should be attributed as follows: For reproduction of material from NJC: [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the Centre National de la Recherche Scientifique (CNRS) and the RSC. For reproduction of material from PCCP: [Original citation] - Published by the PCCP Owner Societies. For reproduction of material from PPS: [Original citation] - Published by The Royal Society of Chemistry (RSC) on behalf of the European Society for Photobiology, the European Photochemistry Association, and RSC. For reproduction of material from all other RSC journals: [Original citation] - Published by The Royal Society of Chemistry.