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CMP
Credit: Jack Hobhouse

David Keen

Visiting Professor

Sub department

  • Condensed Matter Physics

Research groups

  • X-ray and neutron scattering
david.keen@physics.ox.ac.uk
Telephone: 01865 (2)72310
Clarendon Laboratory, room 106
  • About
  • Publications

Mapping short-range order at the nanoscale in metal–organic framework and inorganic glass composites

Nanoscale Royal Society of Chemistry 14:44 (2022) 16524-16535

Authors:

Joonatan EM Laulainen, Duncan N Johnstone, Ivan Bogachev, Louis Longley, Courtney Calahoo, Lothar Wondraczek, David A Keen, Thomas D Bennett, Sean M Collins, Paul A Midgley

Abstract:

) inorganic glass. STEM-ePDF enables separation of MOF and inorganic glass domains from atomic structure differences alone, showing abrupt changes in atomic structure at interfaces with interatomic correlation distances seen in X-ray PDF preserved at the nanoscale. These findings underline that the average bulk amorphous structure is retained at the nanoscale in the growing family of MOF glasses and composites, a previously untested assumption in PDF analyses crucial for future non-crystalline nanostructure engineering.
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Formation of new crystalline qtz-[Zn(mIm)2] polymorph from amorphous ZIF-8

Chemical Communications Royal Society of Chemistry 58:85 (2022) 11949-11952

Authors:

Michael F Thorne, Celia Castillo-Blas, Lauren N McHugh, Alice M Bumstead, Georgina Robertson, Adam F Sapnik, Chloe S Coates, Farheen N Sayed, Clare P Grey, David A Keen, Martin Etter, Ivan da Silva, Krunoslav Užarević, Thomas D Bennett

Abstract:

gas sorption properties and dye adsorption ability were investigated.
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Modeling the Effect of Defects and Disorder in Amorphous Metal–Organic Frameworks

Chemistry of Materials American Chemical Society (ACS) 34:20 (2022) 9042-9054

Authors:

Irene Bechis, Adam F Sapnik, Andrew Tarzia, Emma H Wolpert, Matthew A Addicoat, David A Keen, Thomas D Bennett, Kim E Jelfs
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Semi‐analytic theory of multiphonon effects on the static structure factors of warm solids

Acta Crystallographica Section A: Foundations and advances International Union of Crystallography (IUCr) 78:5 (2022) 415-421
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An N⋯H⋯N low-barrier hydrogen bond preorganizes the catalytic site of aspartate aminotransferase to facilitate the second half-reaction

Chemical Science Royal Society of Chemistry 13:34 (2022) 10057-10065

Authors:

Victoria N Drago, Steven Dajnowicz, Jerry M Parks, Matthew P Blakeley, David A Keen, Nicolas Coquelle, Kevin L Weiss, Oksana Gerlits, Andrey Kovalevsky, Timothy C Mueser

Abstract:

and catalytic Lys258 Nζ amino groups an equally shared deuterium is observed in an apparent low-barrier hydrogen bond (LBHB). Density functional theory calculations were performed to provide further evidence of this LBHB interaction. The structural arrangement and the juxtaposition of PMP and Lys258, facilitated by the LBHB, suggests active site preorganization for the incoming ketoacid substrate that initiates the second half-reaction.
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