Finally, we take the perspective that these fatty acid capped oxo clusters are the smallest conceivable nanocrystal prototypes. While technically not a crystal anymore, such a cluster is the lower limit of scaling down a ligand capped metal oxide nanocrystal. Hence, it has a maximized surface-to-volume ratio. Maximizing surface area is particularly important in heterogeneous catalysis and we thus hypothesized that oxo clusters (diameter = 0.5 nm)