Superatomic Au13 clusters ligated by different N-heterocyclic carbenes and their ligand-dependent catalysis, photoluminescence, and proton sensitivity
carbene ligands, gold nanocluster, catalysis, luminescence, Au13
We report herein a class of superatomic Au13 clusters stabilized by different N-heterocyclic carbenes (NHCs). The clusters show diverse metal surface structures, properties and functions as exemplified by: (1) the first anionic Au13 cluster [Au13(NHC-1)6Br6]−, which has bulky NHC-1 ligands that lead to a rather open metal surface contributing to its high catalytic activity; (2) the tricationic cluster [Au13(NHC-2)5Br2]3+ which has bidentate, benzyl-rich NHC-2 ligands that make it ultra-stable and highly-luminescent, suitable for bio-imaging; and (3) by bearing two pyridyl groups on NHC-3, the dicationic cluster [Au13(NHC-3)9Cl3]2+ exhibits reversible and stable visible absorption and solubility responses to protonation/deprotonation cycles, making it a potential pH sensor (NHC-1 = 1,3-diisopropylbenzimidazolin-2-ylidene; NHC-2 = 1,3-bis(1-benzyl-1H-benzimidazol-1-ium-3-yl)propane; NHC-3 = 1,3-bis(picolyl)benzimidazolin-2-ylidene). The study nicely demonstrates the importance of ligands in designing metal nanoclusters with desired functionalities.
Tsinghua University Press
Hui Shen,Sijin Xiang,Zhen Xu,Chen Liu,Xihua Li,Cunfa Sun,Shuichao Lin,Boon K. Teo,Nanfeng Zheng, Superatomic Au13 clusters ligated by different N-heterocyclic carbenes and their ligand-dependent catalysis, photoluminescence, and proton sensitivity. NanoRes.2020, 13(7): 1908–1911