jz500052h_si_001.pdf (1.73 MB)
Mixed-Monolayer-Protected Au25 Clusters with Bulky Calix[4]arene Functionalities
journal contribution
posted on 2015-12-17, 00:27 authored by Jukka Hassinen, Petri Pulkkinen, Elina Kalenius, Thalappil Pradeep, Heikki Tenhu, Hannu Häkkinen, Robin H. A. RasAlthough 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.