An End-on-Coordinated As4 Tetrahedron


  • This work was supported by the Deutsche Forschungsgemeinschaft (DFG). C.S. is grateful for a Ph.D. fellowship of the Fonds der Chemischen Industrie. A.Y.T. thanks the Alexander von Humboldt-Stiftung for a reinvitation fellowship.


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One time only: The reaction of [Cp*Ru(dppe)Cl] with the potent As4 transfer reagent [Ag(η2-As4)2]+[pftb] leads to [Cp*Ru(dppe)(η1-As4)]+[pftb] with an unprecedented end-on-coordinated As4 tetrahedron. Reaction with a second cationic ruthenium complex fragment does not lead to a second end-on coordination but to the cleavage of one basal As[BOND]As bond. This behavior, which differs from its phosphorus analogues, is rationalized by DFT calculations.