9783540120001 - Unified Valence Bond Theory of Electronic Structure: Applications (Lecture Notes in Chemistry, 34, Band 34) von Epiotis, Nicolaos Demetrios (5 Ergebnisse)

Softcover. Zustand: Sehr gut. Berlin, Springer 1983. gr.8°. Many figs. VIII, 585 p. Pbck. Lecture Notes in Chemistry, 34.- Slightly browned.

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Taschenbuch. Zustand: Neu. Druck auf Anfrage Neuware - Printed after ordering - 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.

Taschenbuch. Zustand: Neu. Unified Valence Bond Theory of Electronic Structure | Applications | N. D. Epiotis | Taschenbuch | viii | Englisch | 1983 | Springer | EAN 9783540120001 | Verantwortliche Person für die EU: Springer Verlag GmbH, Tiergartenstr. 17, 69121 Heidelberg, juergen[dot]hartmann[at]springer[dot]com | Anbieter: preigu.