title: Transition-metal-mediated activation of the heptaarsenide trianion: isolation of a diaryltetraarsenabutadienediide.
abstract: Reaction of an ethylenediamine solution of K(3)As(7) with the low-valent, low-coordinate cobalt(II) complex [Co(mes)(2)(PEt(2)Ph)(2)] yielded the novel dianionic species [Co(η(3)-As(3)){η(4)-As(4)(mes)(2)}](2-) (1). The [η(4)-As(4)(mes)(2)](2-) moiety present in 1 is a rare example of a group 15 analogue of a butadienediide.
authors.affiliation: Department of Chemistry, University of Oxford, Inorganic Chemistry Laboratory, South Parks Road, Oxford, OX1 3QR, UK.
authors.forename: Caroline M
authors.initials: CM
authors.lastname: Knapp
authors.forename: B H
authors.initials: BH
authors.lastname: Westcott
authors.forename: M A C
authors.initials: MA
authors.lastname: Raybould
authors.forename: J E
authors.initials: JE
authors.lastname: McGrady
authors.forename: J M
authors.initials: JM
authors.lastname: Goicoechea