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A test of crystal structure prediction of small organic molecules. 2000

J P Lommerse, and W D Motherwell, and H L Ammon, and J D Dunitz, and A Gavezzotti, and D W Hofmann, and F J Leusen, and W T Mooij, and S L Price, and B Schweizer, and M U Schmidt, and van Eijck BP, and P Verwer, and D E Williams
Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England, UK. lommerse@ccdc.cam.ac.uk

A collaborative workshop was held in May 1999 at the Cambridge Crystallographic Data Centre to test how well currently available methods of crystal structure prediction perform when given only the atomic connectivity for an organic compound. A blind test was conducted on a selection of four compounds and a wide range of methodologies representing, the principal computer programs currently available were used. There were 11 participants who were allowed to propose at most three structures for each compound. No program gave consistently reliable results. However, seven proposed structures were close to an experimental one and were classified as "correct". One compound occurred in two polymorphs, but only one form was predicted correctly among the calculated structures. The basic problem with lattice energy based methods of crystal structure prediction is that many structures are found within a few kJ mol(-1) of the global minimum. The fine detail of the force-field methodology and parametrization influences the energy ranking within each method. Nevertheless, present methods may be useful in providing a set of structures as possible polymorphs for a given molecular structure.

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