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  • 1H NMR  (2)
  • Featureless lineshapes  (1)
  • One-dimensional nutation  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Application of one-dimensional nutation nuclear magnetic resonance to ^5^1V in ferroelastic BiVO"4
    Amsterdam : Elsevier
    Solid State Nuclear Magnetic Resonance 3 (1994), S. 231-236 
    Details
    ISSN: 0926-2040
    Keywords: Ferroelastic BiVO"4 ; One-dimensional nutation ; Spin-72 ; ^5^1V nuclear magnetic resonance
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0926-2040(94)90043-4
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    1H NMR of hydrogen chemisorbed on Pt-Au/Al2O3 catalysts. Evidence for the formation of mixed particles (1995)
    Springer
    Catalysis letters 34 (1995), S. 321-329 
    Details
    ISSN: 1572-879X
    Keywords: 1H NMR ; hydrogen chemisorption ; Pt-Au bimetallic catalyst ; metal dispersion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The evolution of the Pt-Au/Al2O3 system with the reduction time can be followed by1H NMR of chemisorbed hydrogen. When the reduction time increases, the signal with the positive shift, due to hydrogen chemisorbed on pure gold, decreases and disappears completely. At the same time there is a large variation in the negative chemical shift of the hydrogen chemisorbed on the particles containing platinum. This evolution of the NMR spectra demonstrates that mixed Pt-Au particles are formed. Although it appears that after a very long reduction time the platinum covers the gold, the distribution of these two metals in the particles at the atomic scale cannot be determined by this technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00806881
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Proton NMR studies on concentrated aqueous sulfuric acid solutions and Nafion-H (1997)
    Springer
    Catalysis letters 49 (1997), S. 129-136 
    Details
    ISSN: 1572-879X
    Keywords: sulfuric acid ; Nafion-H ; acidity ; hydronium ions ; 1H NMR
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Sulfuric acid containing limited amounts of water, H2SO4.nH2O with 0.23≤n≤4, has been studied by 1H broad-line NMR at 4 K and MAS NMR at room temperature. The broad-line NMR spectra indicate the formation of H3O+ and HSO4 - ions. H2SO4.2H2O is correctly written as H3O+HSO4 -.H2O. The results are compared with the Nafion- H/water system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019077910277
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Determination of the quadrupole coupling from featureless line shapes (1994)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 32 (1994), S. 24-28 
    Details
    ISSN: 0749-1581
    Keywords: Solid-state ; 87Rb ; NMR ; Quadrupole frequency ; Featureless lineshapes ; RbCaF3 ; Point defects ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: NMR nutation and quadrupole echo experiments were used to determine the quadrupole frequency (ωQ) of 87Rb (I = 3/2) in a single crystal of RbCaF3. Since RbCaF3 has a cubic unit cell above 195 K, there is no second-order quadrupole shift and the spectrum is rather featureless. By fitting the response of 87Rb, as a function of pulse duration, to the predicted response we were able to determine that the average ωQ/2π = 4.5 kHz in this sample. Discrepancies in the agreement between the theory and the experiment for the echo response were attributed to differential relaxation of the central and satellite transitions.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260320106
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    Paper (German National Licenses)
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