title: pi-Bonding versus oligomerisation in the aromatic anions [C(6)H(4)N(2)E](-): formation of the cyclic tetrameric tetraanion [C(6)H(4)N(2)Sb](4)(4-).
abstract: The reaction of 1,2-(NH(2))(2)C(6)H(4) with Sb(NMe(2))(3)/(n)BuLi gives the formally-aromatic heterocyclic anion [C(6)H(4)N(2)Sb](-) which oligomerises into a cyclic tetrameric arrangement in the complex [C(6)H(4)N(2)SbLi.PMDETA](4) () (PMDETA = {Me(2)NCH(2)CH(2)}(2)NMe) using a donor-acceptor bonding mode that is unique in related main group heterocyclic anions.
authors.affiliation: Chemistry Department, Cambridge University, Lensfield Road, Cambridge, U.K.CB2 1EW.
authors.forename: Felipe
authors.initials: F
authors.lastname: García
authors.forename: Robert J
authors.initials: RJ
authors.lastname: Less
authors.forename: Vesal
authors.initials: V
authors.lastname: Naseri
authors.forename: Mary
authors.initials: M
authors.lastname: McPartlin
authors.forename: Jeremy M
authors.initials: JM
authors.lastname: Rawson
authors.forename: Dominic S
authors.initials: DS
authors.lastname: Wright