A third blind test of crystal structure prediction

• Autores: Day, G.M.; Motherwell, W.D.S.; Ammon, H.L.; Boerrigter, S.X.M.; Della Valle, R.G.; Venuti, E.; Dzyabchenko, A.; Dunitz, J.D.; Schweizer, B.; Van Eijck, B.P.; Erk, P.; Facelli, Julio C.; Bazterra, V.E.; Ferraro, Marta Beatriz; Hofmann, D.W.M.; Leusen, F.J.J.; Liang, C.; Pantelides, C.C.; Karamertzanis, P.G.; Price, S.L.; Lewis, T.C.; Nowell, H.; Torrisi, A.; Scheraga, H.A.; Arnautova, Yelena A.; Schmidt, M.U.; Verwer, P.
• Año de publicación: 2005
• Idioma: inglés
• Tipo de recurso: artículo
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Following the interest generated by two previous blind tests of crystal structure prediction (CSP1999 and CSP2001), a third such collaborative project (CSP2004) was hosted by the Cambridge Crystallographic Data Centre. A range of methodologies used in searching for and ranking the likelihood of predicted crystal structures is represented amongst the 18 participating research groups, although most are based on the global minimization of the lattice energy. Initially the participants were given molecular diagrams of three molecules and asked to submit three predictions for the most likely crystal structure of each. Unlike earlier blind tests, no restriction was placed on the possible space group of the target crystal structures. Furthermore, Z′ = 2 structures were allowed. Part-way through the test, a partial structure report was discovered for one of the molecules, which could no longer be considered a blind test. Hence, a second molecule from the same category (small, rigid with common atom types) was offered to the participants as a replacement. Success rates within the three submitted predictions were lower than in the previous tests - there was only one successful prediction for any of the three 'blind' molecules. For the 'simplest' rigid molecule, this lack of success is partly due to the observed structure crystallizing with two molecules in the asymmetric unit. As in the 2001 blind test, there was no success in predicting the structure of the flexible molecule. The results highlight the necessity for better energy models, capable of simultaneously describing conformational and packing energies with high accuracy. There is also a need for improvements in search procedures for crystals with more than one independent molecule, as well as for molecules with conformational flexibility. These are necessary requirements for the prediction of possible thermodynamically favoured polymorphs. Which of these are actually realised is also influenced by as yet insufficiently understood processes of nucleation and crystal growth. © 2005 International Union of Crystallography Printed in Great Britain - All rights reserved.
Fil: Day, G.M.. University of Cambridge; Estados Unidos
Fil: Motherwell, W.D.S.. Cambridge Crystallographic Data Centre; Estados Unidos
Fil: Ammon, H.L.. University of Maryland; Estados Unidos
Fil: Boerrigter, S.X.M.. Purdue University; Estados Unidos
Fil: Della Valle, R.G.. Universidad de Bologna; Italia
Fil: Venuti, E.. Universidad de Bologna; Italia
Fil: Dzyabchenko, A.. Karpov Institute Of Physical Chemistry;
Fil: Dunitz, J.D.. Eth Zürich;
Fil: Schweizer, B.. Eth Zürich;
Fil: Van Eijck, B.P.. University of Utrecht; Países Bajos. Utrecht University; Países Bajos
Fil: Erk, P.. Basf Se;
Fil: Facelli, Julio C.. University of Utah; Estados Unidos
Fil: Bazterra, V.E.. University of Utah; Estados Unidos
Fil: Ferraro, Marta Beatriz. University of Utah; Estados Unidos. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina
Fil: Hofmann, D.W.M.. Goethe Universitat Frankfurt; Alemania
Fil: Leusen, F.J.J.. University Of Bradford;
Fil: Liang, C.. Accelrys Inc.;
Fil: Pantelides, C.C.. Imperial College London; Reino Unido
Fil: Karamertzanis, P.G.. Imperial College London; Reino Unido
Fil: Price, S.L.. Colegio Universitario de Londres; Reino Unido
Fil: Lewis, T.C.. Colegio Universitario de Londres; Reino Unido
Fil: Nowell, H.. Colegio Universitario de Londres; Reino Unido
Fil: Torrisi, A.. Colegio Universitario de Londres; Reino Unido
Fil: Scheraga, H.A.. Cornell University; Estados Unidos
Fil: Arnautova, Yelena A.. Cornell University; Estados Unidos
Fil: Schmidt, M.U.. Goethe Universitat Frankfurt; Alemania
Fil: Verwer, P.. Radboud Universiteit Nijmegen; Países Bajos