Details
| Original language | English |
|---|---|
| Pages (from-to) | 76-88 |
| Number of pages | 13 |
| Journal | Solid State Nuclear Magnetic Resonance |
| Volume | 17 |
| Issue number | 1-4 |
| Publication status | E-pub ahead of print - 20 Mar 2002 |
Abstract
The improper ferroelastic phase letovicite (NH4)3H(SO4)2 has been studied by 1H MAS NMR as well as by static 14N NMR experiments in the temperature range of 296-425 K. The 1H MAS NMR resonance from ammonium protons can be well distinguished from that of acidic protons. A third resonance appears just below the phase transition temperature which is due to the acidic protons in the paraelastic phase. The lowering of the second moment M2 for the ammonium protons takes place in the same temperature range as the formation of domain boundaries, while the signals of the acidic protons suffer a line narrowing in the area of Tc. The static 14N NMR spectra confirm the temperature of the motional changes of the ammonium tetrahedra. Two-dimensional 1H NOESY spectra indicate a chemical exchange between ammonium protons and the acidic protons of the paraphase.
Keywords
- 2D NOESY, N, H, Ferroelastic, MAS, Solid-state NMR, Superprotonic conductivity
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Radiation
- Chemistry(all)
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
- Physics and Astronomy(all)
- Instrumentation
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In: Solid State Nuclear Magnetic Resonance, Vol. 17, No. 1-4, 20.03.2002, p. 76-88.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Proton dynamics in letovicite, (NH4)3H(SO4)2
T2 - A 1H and 14N NMR spectroscopic study
AU - Fechtelkord, Michael
AU - Engelhardt, Astrid
AU - Buhl, Josef Christian
AU - Schwalowsky, Lutz
AU - Bismayer, Ulrich
N1 - Funding Information: The authors gratefully acknowledge fruitful discussions on proton dynamics with Ulrike Werner-Zwanziger of the University of Indiana, Department of Chemistry (Bloomington, IN), and Colin A. Fyfe, University of British Columbia (Vancouver, Canada). M. Fechtelkord thanks the Alexander von Humboldt foundation for a Feodor Lynen research fellowship.
PY - 2002/3/20
Y1 - 2002/3/20
N2 - The improper ferroelastic phase letovicite (NH4)3H(SO4)2 has been studied by 1H MAS NMR as well as by static 14N NMR experiments in the temperature range of 296-425 K. The 1H MAS NMR resonance from ammonium protons can be well distinguished from that of acidic protons. A third resonance appears just below the phase transition temperature which is due to the acidic protons in the paraelastic phase. The lowering of the second moment M2 for the ammonium protons takes place in the same temperature range as the formation of domain boundaries, while the signals of the acidic protons suffer a line narrowing in the area of Tc. The static 14N NMR spectra confirm the temperature of the motional changes of the ammonium tetrahedra. Two-dimensional 1H NOESY spectra indicate a chemical exchange between ammonium protons and the acidic protons of the paraphase.
AB - The improper ferroelastic phase letovicite (NH4)3H(SO4)2 has been studied by 1H MAS NMR as well as by static 14N NMR experiments in the temperature range of 296-425 K. The 1H MAS NMR resonance from ammonium protons can be well distinguished from that of acidic protons. A third resonance appears just below the phase transition temperature which is due to the acidic protons in the paraelastic phase. The lowering of the second moment M2 for the ammonium protons takes place in the same temperature range as the formation of domain boundaries, while the signals of the acidic protons suffer a line narrowing in the area of Tc. The static 14N NMR spectra confirm the temperature of the motional changes of the ammonium tetrahedra. Two-dimensional 1H NOESY spectra indicate a chemical exchange between ammonium protons and the acidic protons of the paraphase.
KW - 2D NOESY
KW - N
KW - H
KW - Ferroelastic
KW - MAS
KW - Solid-state NMR
KW - Superprotonic conductivity
UR - http://www.scopus.com/inward/record.url?scp=0034131723&partnerID=8YFLogxK
U2 - 10.1006/snmr.2000.0006
DO - 10.1006/snmr.2000.0006
M3 - Article
C2 - 11235029
AN - SCOPUS:0034131723
VL - 17
SP - 76
EP - 88
JO - Solid State Nuclear Magnetic Resonance
JF - Solid State Nuclear Magnetic Resonance
SN - 0926-2040
IS - 1-4
ER -