An intensely luminescent gold(I)–silver(I) cluster [(C)(AuPPhpy₂)₆Ag₆(CF₃CO₂)₃](BF₄)₅ (PPhpy₂=bis(2-pyridyl)phenylphosphine) (3) is synthesized by the reaction of [(C)(AuPPhpy₂)₆Ag₄](BF₄)₆ with AgCF₃CO₂. All eight faces of the octahedral C@Au₆ core in 3 are capped, that is, six faces are capped by silver ions and two by tetrafluoroborates. Cluster 3 is intensely luminescent in solution with a quantum yield of 92 %. Ligation of CF₃CO₂⁻ ions is vital for the construction and emission properties of 3, as confirmed by DFT calculations. BF₄⁻ ions are involved in the protecting sphere of the metal core, as evidenced by ¹⁹F NMR data. The participation of phosphines, CF₃CO₂⁻, and BF₄⁻ ions in the protection of the emissive core and the enhancement of the rigidity of the cluster result in the high emission efficiency. This is the first example of organic ligands and inorganic anions forming a rigid protecting sphere for luminescent coinage-metal clusters.

中文翻译：

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膦配体和无机阴离子对强发光金（I）-银（I）团簇的完全保护

强烈发光的金（I）-银（I）簇[（C）（AuPPhpy ₂）₆ Ag ₆（CF ₃ CO ₂）₃ ]（BF ₄）₅（PPhpy ₂ =双（2-吡啶基）苯基膦）（通过[[（C）（AuPPhpy ₂）₆ Ag ₄ ]（BF ₄）₆与AgCF ₃ CO ₂的反应合成3）。所有八个面八面体Ç@ Au构成₆在芯3被封端，即，六个面是由银离子和两个通过四氟硼酸盐封端。簇3在溶液中强烈发光，量子产率为92％。CF的结扎₃ CO ₂ ^-离子是用于建造和发射性质至关重要3，通过DFT计算所证实。BF ₄ ^-离子参与在所述金属芯的保护范围，由证明^19个F NMR数据。膦的参与下，CF ₃ CO ₂ ^- ，和BF ₄ ^-离子在保护发射核和增强团簇的刚性方面具有很高的发射效率。这是有机配体和无机阴离子形成用于发光造币金属簇的刚性保护球的第一个例子。