Electrocrystallization of Monolayer-Protected Gold Clusters: Opening the Door to Quality, Quantity, and New...

Thiolate-protected metal clusters are materials of ever-growing importance in fundamental and applied research. Knowledge of their single-crystal X-ray structures has been instrumental to enable advanced molecular understanding of their intriguing properties. So far, however, a general, reliable, chemically clean approach to prepare single crystals suitable for accurate crystallographic analysis was missing. Here we show that single crystals of thiolate-protected clusters can be grown in large quantity and very high quality by electrocrystallization. This method relies on the fact that charged clusters display a higher solubility in polar solvents than their neutral counterparts. Nucleation of the electrogenerated insoluble clusters directly onto the electrode surface eventually leads to the formation of a dense forest of millimeter-long single crystals. Electrocrystallization of three known Au₂₅(SR)₁₈⁰ clusters is described. A new cluster, Au₂₅(S-nC₅H₁₁)₁₈, was also prepared and found to crystallize by forming bundles of millimeter-long Au₂₅ polymers.