From Point Groups to Space Groups. How to expand from a point group to a space group Special and General Positions. Complete Hermann-Maugin Notation. Start with PtCl 4 2-. D4h Character Table. Add Unique Symmetry. The Features. The view is looking down the 4-fold axis
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Look at the Space Group P21/c (#14). This is the most common space group for small molecules.
1. No protein has ever been found to crystallize in this space group. Why is that?
2. Someone reports a crystal in P21/c with Z=1.
Is this possible? Why or why not.
3. What is the symmetry of the special positions in this space group?Homework