Hf12-acetate ligand exchange.The Hf12-acetate cluster (200 mg, 1.26 mmol acetate, 1 eq.) was weighed into a 20 mL vial. 1.5 equivalents (1.89 mmol) of the new carboxylic acid, 597 µL oleic acid or 301 µL methylheptanoic acid ,was added together with 1 mL of DCM and stirred for 60 min, after which a clear solution is obtained. Subsequently, the solution was further stirred under vacuum at 70 °C for 1 hour. The sample transforms from a heterogeneous mixture to a viscous liquid. Purification was performed as described above for the respective cluster. The exchanged clusters were obtained as a viscous oil with a yield of 70 % for the oleate exchanged cluster and 37 % for the methylheptanoic acid exchanged clusters.