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Nanocluster paper For ChemRXiv.pdf (4.41 MB)
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N-Heterocyclic carbene-functionalized magic number gold nanoclusters

preprint
submitted on 09.11.2018 and posted on 12.11.2018 by Mina R. Narouz, Kimberly M. Osten, Phillip J. Unsworth, Renee W. Y. Man, Kirsi Salorinne, Shinjiro Takano, Ryohei Tomihara, Sami Kaappa, Sami Malola, Cao Thang Dinh, J. Daniel Padmos, Kennedy Ayoo, Garrett J. Patrick, Masakazu Nambo, J. Hugh Horton, Edward H. Sargent, Hannu Häkkinen, Tatsuya Tsukuda, Cathleen Crudden
Magic number metal nanoclusters are atomically precise nanomaterials that have enabled unprecedented insight into structure-property relationships in nanoscience. Thiolates are the most common ligand, binding to the cluster via a staple motif in which only central gold atoms are in the metallic state. The lack of other strongly-bound ligands for nanoclusters with different bonding modes has been a significant limitation in the field. Herein, we report a previously unknown ligand for gold (0) nanoclusters: N-heterocyclic carbenes (NHCs), which feature a robust metal-carbon single bond, and impart high stability to the corresponding gold cluster. The addition of a single NHC to gold nanoclusters results in significantly improved stability and catalytic properties in the electrocatalytic reduction of CO2. By varying the conditions, nature and number of equivalents of the NHC, predominantly or exclusively monosubstituted NHC-functionalized clusters result. Clusters can also be obtained with up to five NHCs, as a mixture of species.

History

Email Address of Submitting Author

cruddenc@chem.queensu.ca

Institution

Queen's University

Country

Canada

ORCID For Submitting Author

0000-0003-2154-8107

Declaration of Conflict of Interest

The authors declare no conflict of interest

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