Valence bond theory covalent/ionic resonance

The real structure is a weighted average of the covalent and ionic forms. This leads to one of the most important concepts in valence bond theory, that of resonance (delocalization). The structure of hydrogen can be represented as... [Pg.497]

The covalent-ionic resonance valence bond theory for the origin of the antiferromagnetism of the Cn carboxylate dimers described in Sections 8-l(c) is appropriate when nearest-neighbour Cu-O overlap integrals are omitted. When these integrals are included , the theory has been modilied as follows. We... [Pg.118]

Both cis and trans conformers for ONNO are known , with cis more stable than tram. The additional stability of the cis eonformer is associated with cis 0-0 overlap in valence-bond theory, this occurs primarily via the oxygen 2p7t -orbitals (Fig. 1-5 cf. N2O4 in Section 7-3). The stabilization energy for covalent-ionic resonance of the type (57) (58) is cis 0-0 overlap dependent (Section... [Pg.154]

Valence bond (VB) method (p. 520) covalent structure (p. 521) resonance theory (p. 520) Heitler-London function (p. 521) ionic structure (p. 521)... [Pg.563]

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