Capturing the H 2 –Metal Interaction in Mg-MOF-74 Using Classical Polarization

Handle URI:
http://hdl.handle.net/10754/597726
Title:
Capturing the H 2 –Metal Interaction in Mg-MOF-74 Using Classical Polarization
Authors:
Pham, Tony; Forrest, Katherine A.; McLaughlin, Keith; Eckert, Juergen; Space, Brian
Abstract:
© 2014 American Chemical Society. Grand canonical Monte Carlo (GCMC) simulations of H2 sorption were performed in Mg-MOF-74, a metal-organic framework (MOF) that displays very high H2 sorption affinity. Experimental H2 sorption isotherms and isosteric heats of adsorption (Qst) values were reproduced using a general purpose materials sorption potential that includes many-body polarization interactions. In contrast, using two models that include only charge-quadrupole interactions failed to reproduce such experimental measurements even though they are the type normally employed in such classical force field calculations. Utilizing the present explicit polarizable model in GCMC simulation resulted in a Mg2+-H2 distance of 2.60 Å, which is close to a previously reported value that was obtained using electronic structure methods and comparable to similar experimental measurements. The induced dipole distribution obtained from simulation assisted in the characterization of two previously identified sorption sites in the MOF: the Mg2+ ions and the oxido group of the linkers. The calculated two-dimensional quantum rotational levels for a H2 molecule sorbed onto the Mg2+ ion were in good agreement with experimental inelastic neutron scattering (INS) data. Although the H2-metal interaction in MOFs may be thought of as a quantum mechanical effect, this study demonstrates how the interaction between the sorbate molecules and the open-metal sites in a particular highly sorbing MOF can be captured using classical simulation techniques that involve a polarizable potential.
Citation:
Pham T, Forrest KA, McLaughlin K, Eckert J, Space B (2014) Capturing the H 2 –Metal Interaction in Mg-MOF-74 Using Classical Polarization . The Journal of Physical Chemistry C 118: 22683–22690. Available: http://dx.doi.org/10.1021/jp508249c.
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry C
KAUST Grant Number:
FIC/2010/06
Issue Date:
2-Oct-2014
DOI:
10.1021/jp508249c
Type:
Article
ISSN:
1932-7447; 1932-7455
Sponsors:
This work was supported by the National Science Foundation (Award CHE-1152362). Computations were performed under a XSEDE Grant (TG-DMR090028) to B.S. This publication is also based on work supported by Award FIC/2010/06, made by King Abdullah University of Science and Technology (KAUST). The authors also thank the Space Foundation (Basic and Applied Research) for partial support. The authors acknowledge the use of the services provided by Research Computing at the University of South Florida.
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Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorPham, Tonyen
dc.contributor.authorForrest, Katherine A.en
dc.contributor.authorMcLaughlin, Keithen
dc.contributor.authorEckert, Juergenen
dc.contributor.authorSpace, Brianen
dc.date.accessioned2016-02-25T12:55:37Zen
dc.date.available2016-02-25T12:55:37Zen
dc.date.issued2014-10-02en
dc.identifier.citationPham T, Forrest KA, McLaughlin K, Eckert J, Space B (2014) Capturing the H 2 –Metal Interaction in Mg-MOF-74 Using Classical Polarization . The Journal of Physical Chemistry C 118: 22683–22690. Available: http://dx.doi.org/10.1021/jp508249c.en
dc.identifier.issn1932-7447en
dc.identifier.issn1932-7455en
dc.identifier.doi10.1021/jp508249cen
dc.identifier.urihttp://hdl.handle.net/10754/597726en
dc.description.abstract© 2014 American Chemical Society. Grand canonical Monte Carlo (GCMC) simulations of H2 sorption were performed in Mg-MOF-74, a metal-organic framework (MOF) that displays very high H2 sorption affinity. Experimental H2 sorption isotherms and isosteric heats of adsorption (Qst) values were reproduced using a general purpose materials sorption potential that includes many-body polarization interactions. In contrast, using two models that include only charge-quadrupole interactions failed to reproduce such experimental measurements even though they are the type normally employed in such classical force field calculations. Utilizing the present explicit polarizable model in GCMC simulation resulted in a Mg2+-H2 distance of 2.60 Å, which is close to a previously reported value that was obtained using electronic structure methods and comparable to similar experimental measurements. The induced dipole distribution obtained from simulation assisted in the characterization of two previously identified sorption sites in the MOF: the Mg2+ ions and the oxido group of the linkers. The calculated two-dimensional quantum rotational levels for a H2 molecule sorbed onto the Mg2+ ion were in good agreement with experimental inelastic neutron scattering (INS) data. Although the H2-metal interaction in MOFs may be thought of as a quantum mechanical effect, this study demonstrates how the interaction between the sorbate molecules and the open-metal sites in a particular highly sorbing MOF can be captured using classical simulation techniques that involve a polarizable potential.en
dc.description.sponsorshipThis work was supported by the National Science Foundation (Award CHE-1152362). Computations were performed under a XSEDE Grant (TG-DMR090028) to B.S. This publication is also based on work supported by Award FIC/2010/06, made by King Abdullah University of Science and Technology (KAUST). The authors also thank the Space Foundation (Basic and Applied Research) for partial support. The authors acknowledge the use of the services provided by Research Computing at the University of South Florida.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleCapturing the H 2 –Metal Interaction in Mg-MOF-74 Using Classical Polarizationen
dc.typeArticleen
dc.identifier.journalThe Journal of Physical Chemistry Cen
dc.contributor.institutionUniversity of South Florida, Tampa, United Statesen
kaust.grant.numberFIC/2010/06en
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