CHEM 212 Chapter Notes - Chapter 1: Trigonal Planar Molecular Geometry, Substituent, Joseph Achille Le Bel
3 Sep 2016
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None of the formulas that we have described so far convey any information about how the atoms of a molecule are arranged in space. We can depict three-dimensional geometry in molecules using bonds represented by dashed wedges, solid wedges, and lines. A dashed wedge ( ) represents a bond that projects behind the plane of the paper. A solid wedge ( ) represents a bond that projects out of the plane of the paper. An ordinary line ( i ) represents a bond that lies in the plane of the paper. Figure l. 4 shows the tetrahedral structure of methane. We will discuss the physical basis for the geometries of carbon when it has only single bonds, a double bond, or a triple bond in sections 1. 12 14. For now, let us consider some guidelines for representing these bonding patterns in three dimensions using dashed and solid wedge bonds. In general for carbon atoms that have only single bonds:
