By King R.B.
Chemical bonding versions according to graph thought or tensor floor harmonic thought show the analogy among the aromaticity in two-dimensional planar polygonal hydrocarbons reminiscent of benzene and that during 3-dimensional deltahedral borane anions of the kind BnHn2- (6 < or = n < or = 12). Such versions are supported either by means of different computational reports and experimental determinations of electron density distribution. comparable tools can be utilized to review the chemical bonding within the boron polyhedra present in different buildings together with impartial binary boron hydrides, metallaboranes, a variety of allotropes of elemental boron, and boron-rich solid-state steel borides.
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Extra info for Three-Dimensional Aromaticity in Polyhedral Boranes and Related Molecules
5 model discussed above. 7 eV was found to occur in the spectrum of electron states. Some degree of defect- or impurity-induced disorder appeared to be essential to stabilize the structure, since the valence band of the “ideal” structure can accommodate 320 electrons per B105 unit cell compared with the 315 electrons available. These calculations questioned the suggested R-tetragonal modification of pure boron (Table 5), since the electron deficit in the suggested structure should be so severe that the presence of a more electron-rich atom than boron such as carbon or nitrogen would be required leading to stoichiometries such as B50C2 and B50N2.
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