Modeling PCN-61 and PCN-66: Isostructural rht -Metal–Organic Frameworks with Distinct CO 2 Sorption Mechanisms

Handle URI:
http://hdl.handle.net/10754/598859
Title:
Modeling PCN-61 and PCN-66: Isostructural rht -Metal–Organic Frameworks with Distinct CO 2 Sorption Mechanisms
Authors:
Pham, Tony; Forrest, Katherine A.; McDonald, Kyle; Space, Brian
Abstract:
© 2014 American Chemical Society. Simulations of CO2 sorption were performed in two members of the highly tunable rht-metal-organic framework (MOF) platform: PCN-61 and PCN-66. These MOFs differ only in the triisophthalate ligand used to synthesize the respective MOFs. In PCN-61, the center of the ligand contains a benzene ring; this ring is substituted with a triphenylamine group in PCN-66. There are two chemically distinct Cu2+ ions that comprise the copper paddlewheels, [Cu2(O2CR)4], in all rht-MOFs. One type of Cu2+ ion, denoted Cu1, projects into the truncated tetrahedral (T-Td) and truncated octahedral (T-Oh) cages, while the other Cu2+ ion, denoted Cu2, projects into the cuboctahedral (cub-Oh) cages. Electronic structure calculations revealed that, in PCN-61, the Cu2 ions have a significantly higher partial positive charge than the Cu1 ions, whereas the opposite was observed in PCN-66. The simulations revealed that the CO2 molecules sorb initially onto the Cu2+ ions that have the higher partial positive charge, i.e., the Cu2 ions in PCN-61 and the Cu1 ions in PCN-66. This was demonstrated by examining the radial distribution function, g(r), about both Cu2+ ions and the modeled structure at low loading for both MOFs. This study provided insights into how differences in the charge distributions about the copper paddlewheels between two isostructural MOFs, arising from the choice of functionality on the ligand, can lead to different CO2 binding sites at low loading and suggests a more general conceptual framework for controlling sorption through the tuning of MOF electronics.
Citation:
Pham T, Forrest KA, McDonald K, Space B (2014) Modeling PCN-61 and PCN-66: Isostructural rht -Metal–Organic Frameworks with Distinct CO 2 Sorption Mechanisms . Crystal Growth & Design 14: 5599–5607. Available: http://dx.doi.org/10.1021/cg500860t.
Publisher:
American Chemical Society (ACS)
Journal:
Crystal Growth & Design
KAUST Grant Number:
FIC/2010/06
Issue Date:
5-Nov-2014
DOI:
10.1021/cg500860t
Type:
Article
ISSN:
1528-7483; 1528-7505
Sponsors:
This work was supported by the National Science Foundation (Award No. CHE-1152362). Computations were performed under an XSEDE Grant (No. TG-DMR090028) to B.S. This publication is also based on work supported by Award No. 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 would like to acknowledge the use of the services provided by Research Computing at the University of South Florida. K.M. acknowledges the NSF Graduate Research Fellowship Program (GRFP) and the Rackham Merit Fellowship (RMF).
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Full metadata record

DC FieldValue Language
dc.contributor.authorPham, Tonyen
dc.contributor.authorForrest, Katherine A.en
dc.contributor.authorMcDonald, Kyleen
dc.contributor.authorSpace, Brianen
dc.date.accessioned2016-02-25T13:42:35Zen
dc.date.available2016-02-25T13:42:35Zen
dc.date.issued2014-11-05en
dc.identifier.citationPham T, Forrest KA, McDonald K, Space B (2014) Modeling PCN-61 and PCN-66: Isostructural rht -Metal–Organic Frameworks with Distinct CO 2 Sorption Mechanisms . Crystal Growth & Design 14: 5599–5607. Available: http://dx.doi.org/10.1021/cg500860t.en
dc.identifier.issn1528-7483en
dc.identifier.issn1528-7505en
dc.identifier.doi10.1021/cg500860ten
dc.identifier.urihttp://hdl.handle.net/10754/598859en
dc.description.abstract© 2014 American Chemical Society. Simulations of CO2 sorption were performed in two members of the highly tunable rht-metal-organic framework (MOF) platform: PCN-61 and PCN-66. These MOFs differ only in the triisophthalate ligand used to synthesize the respective MOFs. In PCN-61, the center of the ligand contains a benzene ring; this ring is substituted with a triphenylamine group in PCN-66. There are two chemically distinct Cu2+ ions that comprise the copper paddlewheels, [Cu2(O2CR)4], in all rht-MOFs. One type of Cu2+ ion, denoted Cu1, projects into the truncated tetrahedral (T-Td) and truncated octahedral (T-Oh) cages, while the other Cu2+ ion, denoted Cu2, projects into the cuboctahedral (cub-Oh) cages. Electronic structure calculations revealed that, in PCN-61, the Cu2 ions have a significantly higher partial positive charge than the Cu1 ions, whereas the opposite was observed in PCN-66. The simulations revealed that the CO2 molecules sorb initially onto the Cu2+ ions that have the higher partial positive charge, i.e., the Cu2 ions in PCN-61 and the Cu1 ions in PCN-66. This was demonstrated by examining the radial distribution function, g(r), about both Cu2+ ions and the modeled structure at low loading for both MOFs. This study provided insights into how differences in the charge distributions about the copper paddlewheels between two isostructural MOFs, arising from the choice of functionality on the ligand, can lead to different CO2 binding sites at low loading and suggests a more general conceptual framework for controlling sorption through the tuning of MOF electronics.en
dc.description.sponsorshipThis work was supported by the National Science Foundation (Award No. CHE-1152362). Computations were performed under an XSEDE Grant (No. TG-DMR090028) to B.S. This publication is also based on work supported by Award No. 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 would like to acknowledge the use of the services provided by Research Computing at the University of South Florida. K.M. acknowledges the NSF Graduate Research Fellowship Program (GRFP) and the Rackham Merit Fellowship (RMF).en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleModeling PCN-61 and PCN-66: Isostructural rht -Metal–Organic Frameworks with Distinct CO 2 Sorption Mechanismsen
dc.typeArticleen
dc.identifier.journalCrystal Growth & Designen
dc.contributor.institutionUniversity of South Florida Tampa, Tampa, United Statesen
dc.contributor.institutionUniversity Michigan Ann Arbor, Ann Arbor, United Statesen
kaust.grant.numberFIC/2010/06en
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