and 4b 2+ to 0.25 mol% to still obtain slightly reduced yields of 51% and 76% (Table ). The better performance of the N-Ph catalyst at low catalyst loadings agrees with a more robust catalyst system similar to the Fukuzumi/Nicewicz catalyst comparison. That reasoning is further substantiated by an assay comparing the inherent stability of both catalysts upon blue cw laser excitation (Figure ). Under these conditions, 4b 2+ is more photostable than 4a 2+ by almost one order of magnitude.