Hf12-acetate, oleate and methylbutanoate. Hafnium n-butoxide (1.9 mL, mmol, 1 eq.) was mixed with 8 equivalents of acetic, oleic or methylbutyric acid. Prior to mixing dry DCM was added to the hafnium precursor in order to set [Hf] = 0.5 M in the whole reaction mixture. The Hf12-acetate and Hf12-oleate were reacted for 24h at 30°C. For the Hf12-oleate no dry DCM was added. The Hf6-methylbutanoate synthesis was kept at 30°C for 48h. Purification was done according to the zirconium clusters for the respective acids.