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Chapter+4.1

# Chapter+4.1 - Chapter 4 Symmetry and Group Theory Lei Li...

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Click to edit Master subtitle style 2/17/10 Chapter 4 Symmetry and Group Lei Li 317-278-2202

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2/17/10 Symmetry in Nature &
2/17/10 B. Using Symmetry in Chemistry 1. Understand what orbitals are used in bonding 2. Predict IR spectra or Interpret UV-Vis spectra 3. Predict optical activity of a molecule II. Symmetry Elements and Operations –. Definitions 1. Symmetry Element = geometrical entity such as a line, a plane, or a point, with respect to which one or more symmetry operations can be carried out

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2/17/10 2. Cn (Rotation Operation) = rotation of the object 360/n degrees about an axis a. The symmetry element is a line b. Counterclockwise rotation is taken as positive c. Principle axis = axis with the largest possible n value d. In choosing Cartesian coordinates, the principle axis is usually chosen as z axis. e. Examples: C32 = two C3s C33 = E C17 axis
2/17/10 Tobacco mosaic virus has a C17 symmetry operation

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2/17/10 3. σ (Reflection Operation) = exchange of points through a plane to an opposite and
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Chapter+4.1 - Chapter 4 Symmetry and Group Theory Lei Li...

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