title: Selective formation and unusual reactivity of tetraarsabicyclo[1.1.0]butane complexes.
abstract: The selective formation of the dinuclear butterfly complexes [{Cp'''Fe(CO)2}2(μ,η(1:1)-E4)] (E = P (1 a), As (1 b)) and [{Cp*Cr(CO)3}2(μ,η(1:1)-E4)] (E = P (2 a), As (2 b)) as new representatives of this rare class of compounds was found by reaction of E4 with the corresponding dimeric carbonyl complexes. Complexes 1 b and 2 b are the first As4 butterfly compounds with a bridging coordination mode. Moreover, first studies regarding the reactivity of 1 b and 2 b are presented, revealing the formation of the unprecedented As8 cuneane complexes [{Cp'''Fe(CO)2}2{Cp'''Fe(CO)}2(μ4,η(1:1:2:2)-As8)] (3 b) and [{Cp*Cr(CO)3}4(μ4,η(1:1:1:1)-As8)] (4). The compounds are fully characterized by NMR and IR spectroscopy as well as by X-ray structure analysis. In addition, DFT calculations give insight into the transformation pathway from the E4 butterfly to the corresponding cuneane structural motif.
authors.affiliation: Institut für Anorganische Chemie, Universität 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: Gábor
authors.initials: G
authors.lastname: Balázs
authors.forename: Manfred
authors.initials: M
authors.lastname: Scheer
keywords: arsenic; butterfly structures; cuneane; main-group chemistry; phosphorus