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John G. Verkade's A Pictorial Approach to Molecular Bonding PDF

By John G. Verkade

ISBN-10: 1468402773

ISBN-13: 9781468402773

ISBN-10: 146840279X

ISBN-13: 9781468402797

Realizing molecular orbitals (MOs) is a prerequisite to appreciating many actual and chemical houses of topic. This widely revised moment version of A Pictorial method of Molecular Bonding provides the author's leading edge method of MOs, producing them pictorially for a wide selection of molecular geometries. a huge enhancement to the second one variation is the computer- and Macintosh-compatible Nodegame software program, that's coordinated with the textual content and aids in pictorially instructing molecular orbital thought utilizing generator orbitals.

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Extra resources for A Pictorial Approach to Molecular Bonding

Sample text

6(~y eV. , more nodes) leads to looser electron binding. In addition to electron ionization, we note that transitions among orbitals are also possible, and this phenomenon gives rise to the electronic spectrum of hydrogen. Notice that the energies of hydro genic orbitals depend only on the quantum number n, and not on lor m. The energies of orbitals of different I and m values for a given n value are therefore the same in one-electron atoms. Orbitals of the same energy are said to be degenerate.

G, =( ~,~, fi) =(- ~,-~, ~) z g2 x Figure 2-18. Orientation and coordinates of the four unit vectors along which lie the (Sp3) hybrid AOs (th k). which point to the corners of a regular tetrahedron as given by their coordinates in Figure 2-18. Shortly we shall consider the relationships among the various hybrid quadruple sets. To visualize the relationships between the tetrahedral and trigonal hybrids, we shall first briefly discuss an alternative set of hybrids (ih k ) using the definitions in Equation 2-49: (ih k) = t(2s) + tj3(2pgk) (2pggk) = ¢(2px) + 'l(2py) + ((2pz) (2-49) wherein the new directional unit vectors gk = (¢k, 'lb (k) are given by Equation 2-50: gl =-t)8f1 +-te z g2 = -t )8f2 + -tez g3 = -t)8f3 + -tez g4=-ez ' (2-50) Here the new vectors gk are expressed in terms of the three previously discussed trigonal unit vectors fk in the xy plane, and the z axis unit vector ez .

2. Atomic Orbitals 50 By similarly tnixing an (s) AO with one or more (p) AOs, hybrid sets of the digonal, trigonal, and tetrahedral types are formed which, in addition to possessing orientational flexibility, also localize electron density to a greater extent than their canonical parent AOs. Finally, we addressed the possibility of unequal mixing of (s) and (p) AOs and discovered that equivalent hybrid sets are related by series of intermediate hybrids. PROBLEMS I. Sketch all the 6h atomic orbitals and label the 8, fjJ, and r nodes.

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A Pictorial Approach to Molecular Bonding by John G. Verkade


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