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Unified Valence Bond Theory of Electronic Structure - Applications (Paperback, Softcover reprint of the original 1st ed. 1983)
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Unified Valence Bond Theory of Electronic Structure - Applications (Paperback, Softcover reprint of the original 1st ed. 1983)
Series: Lecture Notes in Chemistry, 34
Expected to ship within 10 - 15 working days
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The bond diagrammatic representation of molecules is the foundation
of MOVB theory. To a certain extent, this kind of representation is
analogous to the one on which "resonance theory" is based and this
fact can be projected by a comparison of the various ways in which
MOVB theory depicts a species made up of three core and two ligand
MO's which define two subsystems containing a total of six
electrons and the ways in which "resonance theory" (i. e. ,
qualitative VB theory) depicts a six-electron-six-AO species such
as the pi system of CH =CH-CH=CH-CH=O. The 2 different pictorial
representations are shown in Scheme 1 so that the analogies are
made evident. First of all, the total MOVB diagrammatic
representation of the 6/5 species is obtained by a linear
combination of three complete bond diagrams, as in Al, which
describe the optimal linear combination of!l! MOVB Configuration
Wavefunctions (CW's). By the same token, a total VB diagrammatic
representation of the 6/6 species can be obtained by writing a "dot
structure", as in Bl, and taking this to mean the optimal linear
combination of all VB CW's. Next, we can approxi mate the MOVB
wavefunction of the 6/5 species by one complete (or detailed) bond
dia gram" (A2). No simple VB representation analogy can be given in
this case. Alterna tively, we can approximate the MOVB wavefunction
by a linear combination of compact bond diagrams, as in A3, in the
way described before.
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