[C] is the concentration of the complex in question. We report both these rates for complex 1 at 280 K and 300 K in Table . It is noteworthy, that the dissociation at 300 K is in good agreement to that expected from literature 4 of 20 s -1 . For complexes 2 and 3 we give 𝑘 𝐻2 𝑑 [H 2 ] as a useful measure for the amount of H 2 being exchanged by these complexes (the hydrogen concentration in our experiments was 16 mM. It should be noted, that with the 50 Hz amplitude used in our studies, only one resonance of complex 2 can be excited (thus the obtained value from the fit needs to be multiplied by 2). It should be noted, that the uncertainties in the table were obtained by fitting equation S2 to the data shown in figure and do not take into account systematic errors induced by the simplification of this approach.