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Nanocluster paper For ChemRXiv.pdf (4.41 MB)
N-Heterocyclic carbene-functionalized magic number gold nanoclusters
Preprints are manuscripts made publicly available before they have been submitted for formal peer review and publication. They might contain new research findings or data. Preprints can be a draft or final version of an author's research but must not have been accepted for publication at the time of submission.
submitted on 09.11.2018 and posted on 12.11.2018by 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.