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Opis

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.

Szczegóły książki

Kategoria Książki po angielsku Mathematics & science Chemistry Physical chemistry

• Pełny tytuł: Unified Valence Bond Theory of Electronic Structure
• Podtytuł: Applications
• Autor: N. D. Epiotis
• Język: Angielski
• Oprawa: Miękka
• Liczba stron: 589
• EAN: 9783540120001
• ISBN: 9783540120001
• ID: 06625099
• Wydawca: Springer-Verlag Berlin and Heidelberg GmbH & Co. KG
• Waga: 1020 g
• Wymiary: 244 × 170 × 33 mm
• Data wydania: 01. March 1983

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