title: Potassium S2N-heteroscorpionates: structure and iridaboratrane formation.
abstract: The potassium salts of the new S(2)N-heteroscorpionate ligand hydrobis(methimazolyl)(3,5-dimethylpyrazolyl)borate [HB(mt)(2)(pz(3,5-Me))](-) and its known analogue hydrobis(methimazolyl)(pyrazolyl)borate [HB(mt)(2)(pz)](-) (prepared from KTp' or KTp and methimazole, Hmt), and the adduct KTp·Hmt have polymeric structures in the solid state (the first a ladder and the other two chains). The iridaboratranes [IrHLL'{B(mt)(2)X}] (X = pz(3,5-Me) or pz), prepared from the heteroscorpionate anion and [{Ir(cod)(μ-Cl)}(2)] (LL' = cod), subsequent carbonylation [LL' = (CO)(2)] and then reaction with phosphine [LL' = (CO)(PR(3)), R = Ph or Cy], have a pendant pyrazolyl ring and a bicyclo-[3.3.0] cage formed by an S(2)-bound B(mt)(2) fragment. The binuclear species [(cod)HIr{μ-B(mt)(3)}IrCl(cod)], the only isolated product of the reaction of KTm with [{Ir(cod)(μ-Cl)}(2)], also has an S(2)-bound iridaboratrane unit but with the third mt ring linked to square planar iridium(I).
authors.affiliation: School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.
authors.forename: María J
authors.initials: MJ
authors.lastname: López-Gómez
authors.forename: Neil G
authors.initials: NG
authors.lastname: Connelly
authors.forename: Mairi F
authors.initials: MF
authors.lastname: Haddow
authors.forename: Alex
authors.initials: A
authors.lastname: Hamilton
authors.forename: Matteo
authors.initials: M
authors.lastname: Lusi
authors.forename: Ulrich
authors.initials: U
authors.lastname: Baisch
authors.forename: A Guy
authors.initials: AG
authors.lastname: Orpen