Journal of the Chemical Society, Dalton Transactions p. 597 - 602 (1982)
Update date:2022-08-11
Topics:
Barlow, Michael T.
Dain, C.John
Downs, Anthony J.
Gaseous Ga(BH4)2H, as studied by electron diffraction, appears to consist monomeric HGa<(μ-H)2BH2>2 molecules with five-fold co-ordination of the gallium atom, a single terminal (t) Ga-H bond, and two doubly bridget (b) tetrahydroborate groups.The primary features of the structure involve the dimensions: Υ(Ga-B)217.2(0.5),Υ(Ga-H)(average) 177.4(1.7), and Υ(B-H) (average) 127.7(1.4) pm; B-Ga-B 112.2(1.5)deg (distances correspond to Υa; figures in parentheses are the estimated standard deviations of the last digist).Results are given for refinements based on structural model with C2υ symmetry imposed, but a significantly better fit to the experimental data is achieved if this constraint is relaxed so that Ga(β-H)2B moieties assume an unsymmetrical form with Υ(Ga-Hb) 176.2(1.5) and 189.1(2.5) pm and Υ(B-Hb) 125.0(8.1) and 145.6(3.3) pm.The five hydrogen atoms directly bound to the gallium atom form a slightly distored rectangularly based pyramid.The features of the structure are collated with those of other hydrogallium and tetrahydroborate derivatives.
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