Abstract
We have synthesized two copper nanoclusters(NCs)with a protection of the same ligand diphenylphosphino-2-pyridine(C17H14NP,dppy for short),formulated as Cu4(dppy)4Cl2 and Cu21(dppy)10,respectively.The former one bears a distorted tetrahedron Cu4 core with its six edges fully protected by chlorine and dppy ligands,while the latter presents a symmetric Cu21 core on which ten dppy molecules function as monolayer protection via well-organized monodentate or bidentate coordination.Interestingly,the Cu4(dppy)4Cl2 cluster exhibits a strong yellow emission at～577 nm,while Cu21(dppy)10 displays dual emissions in purple(～368nm)and green(～516nm)regions respectively.In combination with TD-DFT calculations,we demonstrate the origin of altered emissions and unique stability of the two copper nan-oclusters pertaining to the ligand coordination and metallic superatomic states.
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