Ultrahigh-field 67 Zn NMR reveals short-range disorder in zeolitic imidazolate framework glasses.

Autor: Madsen RSK; Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark., Qiao A; Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark., Sen J; Department of Materials Science and Engineering, University of California at Davis, Davis, CA 95616, USA., Hung I; National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive Tallahassee, FL 32310, USA., Chen K; National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive Tallahassee, FL 32310, USA., Gan Z; National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive Tallahassee, FL 32310, USA., Sen S; Department of Materials Science and Engineering, University of California at Davis, Davis, CA 95616, USA. yy@bio.aau.dk sbsen@ucdavis.edu., Yue Y; Department of Chemistry and Bioscience, Aalborg University, 9220 Aalborg, Denmark. yy@bio.aau.dk sbsen@ucdavis.edu.; State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China.; School of Materials Science and Engineering, Qilu University of Technology, Jinan 250353, China.
Jazyk: angličtina
Zdroj: Science (New York, N.Y.) [Science] 2020 Mar 27; Vol. 367 (6485), pp. 1473-1476.
DOI: 10.1126/science.aaz0251
Abstrakt: The structure of melt-quenched zeolitic imidazole framework (ZIF) glasses can provide insights into their glass-formation mechanism. We directly detected short-range disorder in ZIF glasses using ultrahigh-field zinc-67 solid-state nuclear magnetic resonance spectroscopy. Two distinct Zn sites characteristic of the parent crystals transformed upon melting into a single tetrahedral site with a broad distribution of structural parameters. Moreover, the ligand chemistry in ZIFs appeared to have no controlling effect on the short-range disorder, although the former affected their phase-transition behavior. These findings reveal structure-property relations and could help design metal-organic framework glasses.
(Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works.)
Databáze: MEDLINE
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