title: An end-on-coordinated As4 tetrahedron.
abstract: One time only: The reaction of [Cp*Ru(dppe)Cl] with the potent As4 transfer reagent [Ag(η(2)-As4)2](+)[pftb](-) leads to [Cp*Ru(dppe)(η(1)-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-As bond. This behavior, which differs from its phosphorus analogues, is rationalized by DFT calculations.
authors.affiliation: Institute of Inorganic Chemistry, University of Regensburg, 93040 Regensburg, Germany.
authors.forename: Christoph
authors.initials: C
authors.lastname: Schwarzmaier
authors.forename: Alexey Y
authors.initials: AY
authors.lastname: Timoshkin
authors.forename: Manfred
authors.initials: M
authors.lastname: Scheer
keywords: arsenic; coordination chemistry; density functional calculations; main-group chemistry; ruthenium