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Unexpected structural/motional mode of water intercalated into an α-crystalline zirconium phosphate deduced by 31P and 2H solid-state MAS NMR spectra

Journal Article · · Magnetic Resonance in Chemistry
DOI:https://doi.org/10.1002/mrc.5225· OSTI ID:1976359
 [1];  [2];  [2];  [2]
  1. Texas A & M University, College Station, TX (United States); OSTI
  2. Texas A & M University, College Station, TX (United States)

Here, in developing the approach to understanding dynamics of intercalates in layered materials, crystalline-layered zirconium phosphate Zr (HPO4)2·0.35D2O has been prepared and characterized by the 1H, 31P, and 2H solid-state MAS NMR spectra, including 31P and 2H T1 measurements. At temperatures >253 K, the intercalated water shows two spectrally-distinguished deuterons unprecedentedly with different DQCC's and 2H T1 times, one of which is hydrogen bonded. The collected data allowed to identify an unexpected bonding/dynamic mode of water molecules, which experience fast rotation around the hydrogen bond, formed with a zirconium-coordinated oxygen. The low-temperature 2H MAS NMR experiments have demonstrated the presence of additional hydrogen bond P—(H)O˙˙˙ DO, population of which grows on cooling to 195 K corresponding to the doubly hydrogen-bonded immobile water molecule.

Research Organization:
Texas A & M University, College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Robert A. Welch Foundation
Grant/Contract Number:
SC0017864
OSTI ID:
1976359
Alternate ID(s):
OSTI ID: 1826628
Journal Information:
Magnetic Resonance in Chemistry, Journal Name: Magnetic Resonance in Chemistry Journal Issue: 2 Vol. 60; ISSN 0749-1581
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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