Explicit treatment of hydrogen bonds in the universal force field: validation and application for metal-organic frameworks, hydrates, and host-guest complexes

Coupry, DE, Addicoat, MA and Heine, T, 2017. Explicit treatment of hydrogen bonds in the universal force field: validation and application for metal-organic frameworks, hydrates, and host-guest complexes. The Journal of Chemical Physics, 147 (16), p. 161705. ISSN 0021-9606

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Abstract

A straightforward means to include explicit hydrogen bonds within the Universal Force Field is presented. Instead of treating hydrogen bonds as non-bonded interaction subjected to electrostatic and Lennard-Jones potentials, we introduce an explicit bond with negligible bond order, thus maintaining the structural integrity of the H-bonded complexes and avoiding the necessity to assign arbitrary charges to the system. The explicit hydrogen bond changes the coordination number of the
acceptor site and the approach is thus most suitable for systems with under-coordinated atoms, such as many metal-organic frameworks, however, it also shows excellent performance for other systems involving a hydrogen-bonded framework. In particular, it is an excellent means for creating starting structures for molecular dynamics and for investigations employing more sophisticated methods.
The approach is validated for the hydrogen bonded complexes in the S22 dataset and then employed for a set of metal-organic frameworks from the Computation-Ready Experimental (CoRE) database and several hydrogen bonded crystals including water ice and clathrates. We show that
direct inclusion of hydrogen bonds reduces the maximum error in predicted cell parameters from 66% to only 14% and the mean unsigned error is similarly reduced from 14% to only 4%. We posit that with the inclusion of hydrogen bonding, the solvent-mediated breathing of frameworks such as MIL-53 is now accessible to rapid UFF calculations, which will further the aim of rapid computational scanning of metal-organic frameworks while providing better starting points for electronic structure calculations.

Item Type: Journal article
Publication Title: The Journal of Chemical Physics
Creators: Coupry, D.E., Addicoat, M.A. and Heine, T.
Publisher: AIP Publishing
Date: 15 June 2017
Volume: 147
Number: 16
ISSN: 0021-9606
Identifiers:
NumberType
10.1063/1.4985196DOI
Divisions: Schools > School of Science and Technology
Depositing User: Jill Tomkinson
Date Added: 23 Jun 2017 09:58
Last Modified: 29 Aug 2017 13:29
URI: http://irep.ntu.ac.uk/id/eprint/31058

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