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Title: Atomic-Level Structural Dynamics of Polyoxoniobates during DMMP Decomposition

Ambient pressure in situ synchrotron-based spectroscopic techniques have been correlated to illuminate atomic-level details of bond breaking and formation during the hydrolysis of a chemical warfare nerve agent simulant over a polyoxometalate catalyst. Specifically, a Cs 8[Nb 6O 19] polyoxoniobate catalyst has been shown to react readily with dimethyl methylphosphonate (DMMP). The atomic-level transformations of all reactant moieties, the [Nb 6O 19] 8- polyanion, its Cs + counterions, and the DMMP substrate, were tracked under ambient conditions by a combination of X-ray absorption fine structure spectroscopy, Raman spectroscopy, and X-ray diffraction. Results reveal that the reaction mechanism follows general base (in contrast to specific base) hydrolysis. Together with computational results, the work demonstrates that the ultimate fate of DMMP hydrolysis at the Cs 8[Nb 6O 19] catalyst is strong binding of the (methyl) methylphosphonic acid ((M)MPA) product to the polyanions, which ultimately inhibits catalytic turnover.
Authors:
 [1] ;  [2] ;  [1] ;  [3] ;  [4] ;  [5] ; ORCiD logo [2] ;  [6] ;  [5] ;  [2] ;  [4] ;  [2] ;  [1]
  1. Stony Brook Univ., NY (United States)
  2. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  3. U.S. Army Edgewood Chemical Biological Center, APG, MD (United States)
  4. Emory Univ., Atlanta, GA (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Columbia Univ., New York, NY (United States)
Publication Date:
Report Number(s):
BNL-114371-2017-JA
Journal ID: ISSN 2045-2322; R&D Project: CO040; KC0302010
Grant/Contract Number:
SC0012704; AC02-06CH11357; AC02-76SF00515; W911NF-15-2-0107; BB11PHM156
Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Research Org:
Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., NY (United States); Emory Univ., Atlanta, GA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Sponsoring Org:
USDOE; Army Research Laboratory (ARL) (United States); US Army Research Office (ARO); Defense Threat Reduction Agency (DTRA) (United States)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; catalysis; physical chemistry
OSTI Identifier:
1395944