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Issue 2, 1981
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The molecular structure of tetraborane(10) in the gas phase as determined by a joint analysis of electron-diffraction and microwave data

Abstract

The structure of the gaseous tetraborane(10) molecule, B4H10, has been redetermined by electron diffraction. The new analysis confirms not only that the structure comprises a folded diamond of boron atoms bridged by four hydrogen atoms, but also (i) that the B–H–B bridges are unsymmetrical, the H2B–Hb distance being 17 pm longer than the HB–Hb distance, and (ii) that the bridging hydrogen atoms are situated 5.6 pm above the plane defined by the three boron atoms of each H2B(HB)2 moiety to fall within the fold of the tetraboron framework. Other salient parameters are (distances correspond for ra; figures in parentheses are the estimated standard deviations of the last digits) : r[B(1)–B(2)] 185.6(0.4), r[B(1)–B(3)] 170.5(1.2), r[B(1)–Ht] 122.1 (1.4), r[B(2)–Ht] 119.4(0.7), r[B(1)–Hb] 131.5(0.9), r[B(2)–Hb] 148.4(0.9) pm; Ht–B(2)–Ht′ 122.7(3.5), Ht″–B(1)–B(3) 111.2(3.5), and the dihedral angle between the two planes B(1)B(2)B(3) and B(1)B(3)B(4) 117.1(0.7)°(t = terminal, b = bridging).

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Article type: Paper
DOI: 10.1039/DT9810000472
Citation: J. Chem. Soc., Dalton Trans., 1981,0, 472-477
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    The molecular structure of tetraborane(10) in the gas phase as determined by a joint analysis of electron-diffraction and microwave data

    C. J. Dain, A. J. Downs, G. S. Laurenson and D. W. H. Rankin, J. Chem. Soc., Dalton Trans., 1981, 0, 472
    DOI: 10.1039/DT9810000472

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