Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 45, Pages 14906-14910Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201809381
Keywords
charge transfer; co-crystals; density functional calculations; electronic structure; salts
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- WalterC. Sumner Foundation
- European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013)/ERC [307358 (ERC-stG-2012-ANGLE)]
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Dispersion-corrected density-functional theory (DFT-D) methods have become the workhorse of many computational protocols for molecular crystal structure prediction due to their efficiency and convenience. However, certain limitations of DFT, such as delocalisation error, are often overlooked or are too expensive to remedy in solid-state applications. This error can lead to artificial stabilisation of charge transfer and, in this work, it is found to affect the correct identification of the protonation site in multicomponent acid-base crystals. As such, commonly used DFT-D methods cannot be applied with any reliability to the study of acid-base co-crystals or salts, while hybrid functionals remain too restrictive for routine use. This presents an impetus for the development of new functionals with reduced delocalisation error for solid-state applications; the structures studied herein constitute an excellent benchmark for this purpose.
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