In situ switching of sorbent functionality as monitored with hyperpolarized ¹²⁹Xe NMR spectroscopy

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DOIResolve DOI: http://doi.org/10.1021/ja002767x
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TypeArticle
Journal titleJACS: Journal of the American Chemical Society
ISSN0002-7863
Volume123
Issue15
Pages35633568; # of pages: 6
AbstractIn this contribution, we demonstrate that a material (organic zeolite mimetic coordination polymer [CuL₂], where L = L- = CF₃COCHCOC(OCH₃)(CH₃)₂) can be endowed with its functionality in situ under molecular-level control. This process involves the isomerization of the ligands followed by phase interconversion from a dense to an open, porous form. The porous (β) form of the complex reveals zeolite-like behavior but, unlike zeolites and many other hard porous frameworks, porosity may be created or destroyed at will by the application of suitable external stimuli. Contact with methylene chloride vapor was used to switch on the sorbent functionality, whereas switching off was accomplished with a temperature pulse. The transformations between functionally inactive α and active β forms, as well as the amount of vacant pore space, were monitored in situ by observing the NMR spectrum of hyperpolarized (HP) Xe atom probes. For methylene chloride, the chemical shift of the coabsorbed HP Xe correlated directly with the amount of adsorbate in the pore system of the open framework, illustrating the use of HP Xe for following sorption kinetics. The adsorption of propane, as an inert adsorbate, was also monitored directly with ¹H NMR, with HP Xe and by BET measurements, revealing more complex behavior.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedYes
Identifier10072378
NPARC number12338859
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Record identifier98974539-c552-4816-85e6-bf5f6bcc22f5
Record created2009-09-11
Record modified2017-03-17
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