title: Novel ion pairs obtained from the reaction of titanium(IV) halides with simple arsane ligands.
abstract: The compounds tert-butylarsenium(III) tri-μ-chlorido-bis[trichloridotitanium(IV)], (C(4)H(12)As)[Ti(2)Cl(9)] or [(t)BuAsH(3)][Ti(2)(μ-Cl)(3)Cl(6)], (II), and bis[bromidotriphenylarsenium(V)] di-μ-bromido-μ-oxido-bis[tribromidotitanium(IV)], (C(18)H(15)AsBr)(2)[Ti(2)Br(8)O] or [Ph(3)AsBr](2)[Ti(2)(μ-O)(μ-Br)(2)Br(6)], (III), were obtained unexpectedly from the reaction of simple arsane ligands with Ti(IV) halides, with (II) lying on a mirror plane in the unit cell of the space group Pbcm. Both compounds contain a completely novel ion, with [(t)BuAsH(3)](+) constituting the first structurally characterized example of a primary arsenium cation. The oxide-bridged titanium-containing [Ti(2)(μ-O)(μ-Br)(2)Br(6)](2-) dianion in (III) is also novel, while the bromidotriphenylarsenium(V) cation is structurally characterized for only the second time.
authors.affiliation: Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, England.
authors.forename: Tegan
authors.initials: T
authors.lastname: Thomas
authors.forename: David
authors.initials: D
authors.lastname: Pugh
authors.forename: Ivan P
authors.initials: IP
authors.lastname: Parkin
authors.forename: Claire J
authors.initials: CJ
authors.lastname: Carmalt