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Issue 6, 1997
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Some tetrahydroborate derivatives of aluminium: crystal structures ofdimethylaluminium tetrahydroborate and the α and β phases ofaluminium tris(tetrahydroborate) at low temperature

Abstract

The structures of several aluminium tetrahydroborates have been investigated, primarily by X-ray diffraction of single crystals at low temperatures. The structure of dimethylaluminium tetrahydroborate has been shown to consist of helical polymeric chains in which Me 2 Al and BH 4 units alternate. The BH 4 groups exhibit bidentate ligation with respect to each of the adjacent metal atoms in a manner reminiscent of [MeZnBH 4 ] and Be(BH 4 ) 2 . Solid aluminium tris(tetrahydroborate) exists in two phases with a transition temperature in the range 180–195 K. Each phase is made up of discrete Al(BH 4 ) 3 units in which the angle between AlB 2 and Al(µ-H) 2 B planes is close to 90° and which conform within the limits of experimental error to D 3h symmetry; in the α phase these molecular units are disposed around a 2 1 crystallographic screw axis.

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Article type: Paper
DOI: 10.1039/A607843E
Citation: J. Chem. Soc., Dalton Trans., 1997, 1007-1012
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    Some tetrahydroborate derivatives of aluminium: crystal structures of dimethylaluminium tetrahydroborate and the α and β phases of aluminium tris(tetrahydroborate) at low temperature

    S. Aldridge, A. J. Blake, A. J. Downs, R. O. Gould, S. Parsons and C. R. Pulham, J. Chem. Soc., Dalton Trans., 1997, 1007
    DOI: 10.1039/A607843E

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