Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

A multinuclear solid-state NMR study of templated and calcined chabazite-type GaPO-34

Tools
- Tools
+ Tools

Amri, Mahrez, Ashbrook, Sharon E., Dawson, Daniel M., Griffin, John M., Walton, Richard I. and Wimperis, Stephen (2012) A multinuclear solid-state NMR study of templated and calcined chabazite-type GaPO-34. The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Volume 116 (Number 28). pp. 15048-15057. doi:10.1021/jp304868w

Research output not available from this repository, contact author.
Official URL: http://dx.doi.org/10.1021/jp304868w

Request Changes to record.

Abstract

The open-framework gallophosphate GaPO-34 is prepared with either 1-methylimidazole or pyridine as the structure-directing agent. 13C and 1H NMR spectra for these two variants of the as-made GaPO-34 are fully assigned, confirming the presence of the protonated amine and water within the pores of both materials. 31P MAS NMR confirms the presence of three crystallographic P sites, while 71Ga MAS and MQMAS NMR spectra reveal three crystallographic Ga sites: two tetrahedral and one six-coordinate. Simulations of 69Ga MAS NMR spectra from these results are in good agreement with spectra acquired at B0 = 20.0 T, and assignments are supported by first-principles calculations. 19F MAS NMR proves the presence of Ga-bridging fluoride within the as-made materials, leading to the six-coordinate gallium. Calcination removes the organic species and fluoride, yielding a microporous chabazite-type GaPO4, containing one tetrahedral Ga site. Exposure to moist air yields calcined, rehydrated GaPO-34 containing four-, five-, and six-coordinate gallium. Upon heating this material, loss of crystallinity is observed by powder X-ray diffraction and NMR, with the latter revealing a range of P and Ga environments. The thermal instability of calcined, rehydrated GaPO-34 contrasts with the isomorphous aluminophosphate, showing that apparently analogous materials may have important differences in reactivity.

Item Type: Journal Article
Divisions: Faculty of Science > Chemistry
Journal or Publication Title: The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter
Publisher: American Chemical Society
ISSN: 1932-7447
Official Date: 19 July 2012
Dates:
DateEvent
19 July 2012Published
Volume: Volume 116
Number: Number 28
Page Range: pp. 15048-15057
DOI: 10.1021/jp304868w
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Engineering and Physical Sciences Research Council (EPSRC), Leverhulme Trust
Grant number: EP/C156591, EP/E041825/1 (EPSRC); F/00/268/BJ (Leverhulme Trust);

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item
twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us