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Displayed in the applet window is the asymmetric unit of the crystal structure of the zinc porphyrin:

In this structure, the asymmetric unit is just half a molecule because the Zn atom lies on a crystallographic center of symmetry. The co-ordinates of the Zn atom are 0.5, 0.5, 0.5. The symmetry-related position in the SHELXL .res file (-X, -Y, -Z) produces another asymmetric unit by inversion through the center of symmetry at 0, 0, 0. This second asymmetric unit has Zn atom co-ordinates of -0.5, -0.5, -0.5 (click "center").

If this asymmetric unit is translated by +1, +1, +1, it is joined to the first asymmetric unit and completes the molecule. (Click "translate")

Compound 938