closo-Halogenohydrohexaborate, I Darstellung der reinen closo-Halogenohydrohexaborate XnB6H6-n 2-, n = 1— 6, X = Cl, Br, I, einschlieftlich der Stereoisomeren / closo-Halogenohydrohexaborate, I Preparation of the Pure closo-Halogenohydrohexaborates XnB6H6-n 2-, n = 1— 6. X = Cl, Br, I, Including the Stereoisomers

Abstract

Through carefully controlled treatment of Na2B6H6 with halogens in aqueous alkaline solution, or with halogenosuccinimides, mixtures of the halogenohydrohexaborates XnB6H6-n 2-, X = Cl, Br, I, n = 1-6, are formed. In der cases with X = Cl, Br, for n = 2-4 both stereoisomers are generated simultaneously in different amounts, whereas with X = I only the trans/mer compounds are formed. All species including the pure isomers have been separated by ion exchange chromatography on diethylaminoethyl cellulose. The composition has been confirmed by chemical analysis. The colourless crystalline tetrabutylammonium salts are fairly stable at room temperature