I agree with Egon that the inclusion of symmetry in Jmol would be very useful to practicing crystallographers like myself. It could be used to display and teach space group symmetry (take a look at http://macxray.chem.upenn.edu/cells/cell457total.html) and to investigate intermolecular attractions like hydrogen bonds (see http://macxray.chem.upenn.edu/9178.html). Also, to address a question about the LATT instruction in SHELXL, I have prepared a PDF document that explains it (http://macxray.chem.upenn.edu/LATT.pdf). I would want the user to have as much control as possible. It would be somewhat useful to have an option that just fills the unit cell with the molecules, but each packing diagram investigation is different and it would be desirable to be able to add a molecule at a time by selecting a symmetry position and any necessary translations.

Patrick J. Carroll
Director, X-ray Facility
Department of Chemistry
University of Pennsylvania
Philadelphia, PA


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