Planar array, of atoms

The l,5-dibora-2,5-cyclohexadiene system (7) is of unusual interest because such a planar array of atoms is predicted to be a Hiickel antiaromatic system, similar to boroles themselves. Indeed, when 103 is generated at low temperatures, it readily rearrange into the nWo-2,3,4,5-tetracarba-hexaboranes6 (8)" (Eq. 33). 

The practice of considering the catalyst as a featureless surface or a planar array of atomic centers deprives theory of an adequate concern for the geometry of the transition from reactants to products. Balandin (23) recognized the importance of the concept of a transition state to the development of a mechanistic theory of catalysis, and in his hands the multiplet theory proved fruitful. However the directional properties of binding orbitals, a subject of more recent development, apparently has not been incorporated into his theory. 

Besides electron-phonon coupling, the shape of the Fermi surface is important in deciding CDW formation. Fermi surfaces of systems containing linear or planar arrays of atoms reflect their one- or two-dimensional character. Since the Fermi surfaces connect many states with the same wave vector, Q, a periodic distortion having the wave vector Q will produce gaps at those portions connected by Q. The energy gained... 

Ans. The Lewis formula for methane shows a flat or planar array of atoms. When we visualize the disposition of the H atoms in a plane, the H atoms are only 90 away from each other as ... 

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See also in sourсe #XX -- [ ]

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