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Comparing hypothetical structures generated in the third Cambridge blind test of crystal structure prediction
1Utrecht University, Department of Crystal and Structural Chemistry, Padualaan 8, 3584 CH Utrecht, The Netherlands. b.p.vaneijck@chem.uu.nl
Acta Crystallographica. Section B, Structural Science
|September 28, 2005
Summary
Crystal structure prediction challenges reveal that even extensive lists of hypothetical structures are often incomplete. Energy calculations show significant discrepancies, making current predictions unreliable.
Area of Science:
- Crystallography
- Computational Chemistry
- Materials Science
Background:
- The Cambridge blind tests evaluate crystal structure prediction methods.
- Accurate prediction of crystal structures is crucial for materials science and drug discovery.
Purpose of the Study:
- To analyze participant-submitted crystal structure predictions for hydantoin and azetidine.
- To assess the completeness and reliability of current crystal structure prediction methodologies.
Main Methods:
- Energy minimization of hypothetical crystal structures using an accurate force field.
- Clustering of minimized structures to group equivalent conformers.
- Calculation of root-mean-square (r.m.s.) deviation between energies of corresponding clusters.
Main Results:
- Many participants identified similar low-energy structures, but no submitted list was exhaustive.
- Inconsistencies were observed even for structures with a single molecule in the asymmetric unit.
- Discrepancies in predicted relative crystal energies were comparable to energy differences between low-energy structures.
Conclusions:
- Current crystal structure prediction methods, even with up to 100 structures, are not consistently reliable.
- The choice of force field and potential inclusion of transition states impact prediction accuracy.
- Further advancements are needed to improve the completeness and dependability of crystal structure prediction.