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Cryo IR Spectroscopy of N2 and H2 on Ru8+: The Effect of N2 on the H-Migration.

We present the cryo IR-PD spectra of the coadsorbed [Ru8(H2)1(N2)4]+ and [Ru8(N2)4(H2)1]+ species differing in the adsorption sequence of H2 and N2, which we record via application of tandem cryo ion trapping. We observe strong evidence for dissociative H2 adsorption, and the spectra reveal differences in the Ru-H stretching region, which we assign to distal and proximal hydrogen atom locations on the Ru8+ cluster, their migration likely hindered by preloaded nitrogen molecules and unaffected by subsequent N2 adsorption.