A population analysis for Be and B oxyanions |
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| Authors: | J L Schlenker D T Griffen M W Phillips G V Gibbs |
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| Institution: | (1) Department of Geological Sciences, Virginia Polytechnic Institute and State University, 24061 Blacksburg, Virginia, USA |
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| Abstract: | Mulliken bond overlap populations calculated for beryllium and boron oxyanions isolated from a number of minerals and synthetic compounds correlate with observed bond lengths with shorter bonds tending to involve larger overlap populations. As the populations were calculated assuming constant bond lengths and observed valence angles, the correlations are asserted to reflect the angular geometry impressed on the oxyanions by neighboring cations. Extended Hückel theory shows that the dependence of overlap population upon valence angles is greater for boron than for beryllium oxyanions. This is consistent with the observation that bond length variations in boron oxyanions are greater than those in corresponding beryllium oxyanions. As expected, observed bond lengths correlate with valence angles with the shorter bonds tending to be involved in wider angles.Now at Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637, USANow at Geochemistry Branch, Phillips Petroleum Co., Bartlesville, Oklahoma 74004, USANow at Department of Geology, University of Toledo, Toledo, Ohio 43606, USA |
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