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Mixed-Monolayer-Protected Au25 Clusters with Bulky Calix[4]arene Functionalities

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journal contribution
posted on 17.12.2015, 00:27 by Jukka Hassinen, Petri Pulkkinen, Elina Kalenius, Thalappil Pradeep, Heikki Tenhu, Hannu Häkkinen, Robin H. A. Ras
Although various complex, bulky ligands have been used to functionalize plasmonic gold nanoparticles, introducing them to small, atomically precise gold clusters is not trivial. Here, we demonstrate a simple one-pot procedure to synthesize fluorescent magic number Au25 clusters carrying controlled amounts of bulky calix[4]­arene functionalities. These clusters are obtained from a synthesis feed containing binary mixtures of tetrathiolated calix[4]­arene and 1-butanethiol. By systematic variation of the molar ratio of ligands, clusters carrying one to eight calixarene moieties were obtained. Structural characterization reveals unexpected binding of the calix[4]­arenes to the Au25 cluster surface with two or four thiolates per moiety.