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Intact As4 Tetrahedra Coordinated Side-On to Metal Cations


  • This work was supported by the Deutsche Forschungsgemeinschaft (DFG). C.S. is grateful for a PhD fellowship of the Fonds der Chemischen Industrie.


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Extremely light sensitive yellow arsenic (As4) reacts with a weakly coordinated silver cation to afford [Ag(η2-As4)2]+ [Al{OC(CF3)3}4] as the first known homoleptic arsenic complex. DFT calculations and Raman spectroscopy clearly indicate the coordination of two intact As4 tetrahedra. This unprecedented complex is used as an As4 transfer agent, which is demonstrated by the synthesis of [(PPh3)Au(η2-As4)]+[Al{OC(CF3)3}4].