Chemistry of Borane Anions: Formation Of Precursors And Their Conversion To Boron Aluminum Nitrides and Metal Borides.

Abstract : Additional evidence was obtained for the formation BH3(2-) and B2H6(2-) and the sequence in which they are formed. The fluxional nature of the anion B10H11(-) was examined by NMR spectroscopy and a single crystal X-ray analysis of data obtained at -150 deg C revealed the presence of two fluxional isomers. An X-ray analysis proved the structure of 2-CH3CNB10H9(-). An X-ray structure of Al(BH4)43(-) showed the presence of eight Al-H-B bounds, a rare example of eight-coordinate aluminum. A unique example of a stable charge transfer complex B10H14I(-) was characterized in the solid state and in solution. Improved syntheses of lanthanide boranes were developed. A new morphology of BN nitride, a tubular form was prepared. Evidence was obtained for a possible mechanism by which this material is formed from amorphous BN is produced from the reaction of Cs with B3H3N3Cl3 AlN-BN composites were produced by a new method, and studies were initiated on the preparation of AlN powders and films. jg p.1