The 1 H NMR spectra of selected oxo clusters are shown in Figure . For Zr12-propionate, hexanoate and oleate, we recognize three different resonances for the alpha CH 2 moiety, indicating three different distinguishable carboxylate environments (see also Figure for the other Zr12 clusters). On the other hand, Zr 6 -methylheptanoate has only two alpha CH resonances (see Figure for Zr6-methylbutanoate). It is striking that the NMR pattern seems to roughly agree with the ν as (COO) pattern in FTIR. Also for the other clusters, For Zr12-acetate, we find four methyl resonances. Diffusion ordered spectroscopy (DOSY),