[Cu₈₁(PhS)₄₆(ᵗBuNH₂)₁₀(H)₃₂]³⁺ Reveals the Coexistence of Large Planar Cores and Hemispherical Shells in High-Nuclearity Copper Nanoclusters
Huang, Ren-Wu, Yin, Jun, Dong, Chunwei, Ghosh, Atanu, Alhilaly, Mohammad J., Dong, Xinglong, Hedhili, Mohamed Nejib, Abou-Hamad, Edy, Alamer, Badriah, Nematulloev, Saidkhodzha, Han, Yu, Mohammed, Omar F., Bakr, Osman M. Bakr
Journal of the American Chemical Society, (2020)
X-ray diffraction, X-ray photoelectron spectroscopy, Catalytic activity, Copper
Copper-based nanomaterials have attracted tremendous interest due to their unique properties in the fields of photoluminescence and catalysis. As a result, studies on the correlation between their molecular structure and their properties are of great importance. Copper nanoclusters are a new class of nanomaterials that can provide an atomic-level view of the crystal structure of copper nanoparticles. Herein, a high-nuclearity copper nanocluster with 81 copper atoms, formulated as [Cu₈₁(PhS)₄₆(ᵗBuNH₂)₁₀(H)₃₂]³⁺ (Cu₈₁), was successfully synthesized and fully studied by X-ray crystallography, X-ray photoelectron spectroscopy, hydrogen evolution experiments, electrospray ionization mass spectrometry, nuclear magnetic resonance spectroscopy, and density functional theory calculations. Cu₈₁ exhibits extraordinary structural characteristics, including (i) three types of novel epitaxial surface-protecting motifs; (ii) an unusual planar Cu₁₇ core; (iii) a hemispherical shell, comprised of a curved surface layer and a planar surface layer; and (iv) two distinct, self-organized arrangements of protective ligands on the curved and planar surfaces. The present study sheds light on structurally unexplored copper nanomaterials and paves the way for the synthesis of high-nuclearity copper nanoclusters.