By J. Duchesne
The Advances in Chemical Physics sequence presents the chemical physics and actual chemistry fields with a discussion board for severe, authoritative reviews of advances in each zone of the self-discipline. packed with state-of-the-art study mentioned in a cohesive demeanour now not stumbled on in different places within the literature, every one quantity of the Advances in Chemical Physics sequence serves because the excellent complement to any complicated graduate classification dedicated to the learn of chemical physics.
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Additional resources for Advances in Chemical Physics: Structure & Properties of Biomolecules, Volume 7
Thus four electrons of like spin occupying these orbitals would have as their most probable arrangement the vertices of a regular tetrahedron. It is easy to show that an infinite set of such combinations is PT. I A ] ELECTRONIC STRUCTURES 19 possible, corresponding t o different orientations of a tetrahedron in space. Trigonal hybrids, sp2, are formed by the carbon atoms of an s and two p orbitals and are directed toward the vertices of an equilateral triangle in the plane of the@orbitals. Digonal hybrids, sp,composed of an s and a p orbital are directed in opposite directions along the axis of symmetry of the p orbital.
If the numerical value of the overlap integral is used as the criterion,l2 the order is the reverse, sp > sp=> s p 3 s p . 83 It is important to note that the directed character of valence bonds can be explained on the basis of correlation of charge and spin. In the case of a pair of electrons, spin correlation tends t o unite, and charge correlation to separate ;in the interaction of pairs both effects act in the same direction and this appears t o be the dominant factor operating in directed valence.
Furthermore, its application to heteronuclear molecules is excluded by mathematical difficulties. Even if now the major part of the studies of molecular structure are carried out using the other method, it should not be forgotten that the VB theory contains a large element of truth and corresponds more closely to the intuition of classical chemists. The other method, the HM (Hund-Mulliken) or theory of molecular orbitals (MO),is the one we will apply in our study and is described in detail below.
Advances in Chemical Physics: Structure & Properties of Biomolecules, Volume 7 by J. Duchesne