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Citation
Tags
HERO ID
5018063
Reference Type
Journal Article
Title
Conformational isomerism controls collective flexibility in metal-organic framework DUT-8(Ni)
Author(s)
Petkov, PS; Bon, V; Hobday, CL; Kuc, AB; Melix, P; Kaskel, S; Düren, T; Heine, T
Year
2019
Is Peer Reviewed?
1
Journal
Physical Chemistry Chemical Physics
ISSN:
1463-9076
EISSN:
1463-9084
Volume
21
Issue
2
Page Numbers
674-680
Language
English
PMID
30542683
DOI
10.1039/c8cp06600k
Web of Science Id
WOS:000454922300013
URL
http://
://WOS:000454922300013
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Abstract
Metal-organic frameworks (MOFs) are coordination networks with organic ligands containing potential voids. Some MOFs show pronounced structural flexibility that may result in closing and re-opening these pores. Here, we show that collective flexibility in a MOF-DUT-8(Ni) - is controlled by conformational isomerism. DUT-8(Ni), a pillared-layer MOF with Ni2 paddle-wheels, dabco pillars and naphthalene dicarboxylate (ndc) linkers, can crystallize in many conformational isomers that depend on the orientation of the non-linear ndc linkers with respect to each other. While the open form is compatible with several of these conformations, only one of them, with alternating linker orientations, is stable as the closed form. We show, by means of first principles calculations, that in the stable closed form, the appreciable lattice strain is compensated by London-dispersion forces between the ndc linkers that arrange with maximum overlap in a stacking order similar to the stacking in graphite. We substantiate these results by well-tempered metadynamics calculations on the DFT-based Born-Oppenheimer potential energy surface, by refined X-ray diffraction data and by nitrogen adsorption data obtained by experiment and grand-canonical Monte-Carlo simulations based on the DFT-optimized and PXRD-derived geometries. While the reported origin of flexibility cannot be generalized to all flexible MOFs, it offers a rational design concept of folding mechanisms in switchable MOFs by exploitation of the stabilization effect of linker stacking in the closed form.
Tags
IRIS
•
Naphthalene
Database Searches
PubMed
Combined data set
Data set for title/abstract screening
Excluded - PECO criteria not met (TIAB)
Feb 2019 Update
PubMed
Other
•
Naphthalene (2021 Evidence mapping publication)
Database Searches
PubMed
Combined data set
Data set for title/abstract screening
Excluded – PECO criteria not met
Feb 2019 Update
PubMed
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