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Boron oxide state mixing

It also seems of interest to compare the stabilities of tetrahedral states of aluminum and boron in terms of this simple qualitative picture. The calculations have revealed that the planar structure is preferential for B(OH)3 as well. The value of r for B(OH)3 is 30.1 kcal/mol, that is, it exceeds substantially the value for Al(OH)3. This is a manifestation of the difference in the covalent radii of B and Al. The value of Ec for the B(OH)3 + HzO system is no longer sufficient to compensate Er, that is, in this system the tetrahedral coordination of the boron atom is unfavorable. However, in the B(OH)3 + OH" system, Ec = 88.4 kcal/mol, that is, the presence of the highly electron-donating oxygen atom of OH- should make the tetrahedral state of boron preferential. Actually, the tetrahedral boron is known to exist in a number of mixed oxides. [Pg.181]

See other pages where Boron oxide state mixing is mentioned: [Pg.880]    [Pg.27]    [Pg.3]    [Pg.105]    [Pg.55]    [Pg.127]    [Pg.441]    [Pg.50]    [Pg.241]    [Pg.909]    [Pg.487]    [Pg.484]    [Pg.457]    [Pg.221]    [Pg.258]    [Pg.15]    [Pg.419]    [Pg.47]    [Pg.418]    [Pg.772]    [Pg.40]    [Pg.129]    [Pg.47]    [Pg.107]   
See also in sourсe #XX -- [ Pg.44 ]



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Boron oxidation

Boronates oxidation

Boronic oxidation

Mixed oxides

Mixed states

Mixing state

Oxidation states mixed

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