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  • Chemistry  (2)
  • characterization  (1)
  • 1
    Electronic Resource
    Electronic Resource
    ESR, FT-Raman spectroscopic and ethanol partial oxidation studies on MoO3/SnO2 catalysts made by metal oxide vapor synthesis (1999)
    Springer
    Catalysis letters 59 (1999), S. 73-77 
    Details
    ISSN: 1572-879X
    Keywords: MOVS ; MoO3/SnO2 ; characterization ; XRD ; ESR ; FT-Raman ; ethanol partial oxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A series of SnO2-supported MoO3 catalysts were prepared by the metal oxide vapor synthesis (MOVS) technique. ESR studies indicated the presence of highly dispersed Mo5+ species in both octahedral and tetrahedral coordination environments at all the loadings studied. At the highest MoO3 loading of 12 wt%, the formation of MoO3 microcrystallites was indicated from the lower intensity of the ESR signal. Raman studies also showed the presence of well dispersed surface molybdate species up to 4.4 wt% MoO3 loading, and the peaks corresponding to microcrystallites of molybdena were observed at 12 wt% MoO3 loading. The ethanol partial oxidation activities of the catalysts increased with increase in MoO3 loading and the catalyst with 4.4 wt% molybdena content showed the highest activity; all the MOVS catalysts showed 100% selectivity to acetaldehyde at low conversions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019099900418
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  • 2
    Electronic Resource
    Electronic Resource
    1H and 13C nuclear magnetic resonance of phenyldibenzophosphole and derivatives: Complete assignment using two-dimensional J-resolved and shift correlation methods (1987)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 25 (1987), S. 774-779 
    Details
    ISSN: 0749-1581
    Keywords: 1H and 13C NMR ; Phenyldibenzophospholes ; assignment, computer simulation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Proton and 13C NMR parameters have been determined for phenyldibenzophosphole and its oxide, sulfide, selenide and W(CO)5 complex from high-resolution one- and two-dimensional (COSY, HETCOR and 2DJ) experiments at 4.7, 7.1 and 9.4 tesla. Assignments of chemical shifts and coupling constants have been made and verified by computer simulation of the proton spectra. The data are discussed in relation to the geometry and electron density at phosphorus and the diamagnetic anisotropy of the W(CO)5 group.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260250908
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  • 3
    Electronic Resource
    Electronic Resource
    Chelate ring effects in 95Mo NMR spectroscopy (1986)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 24 (1986), S. 357-359 
    Details
    ISSN: 0749-1581
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ring contributions (δR) to the chemical shift in 95Mo NMR spectroscopy are defined for some molybdenum(0) complexes of chelating phosphine ligands. The chelate ring effect is greatest for five-membered rings, with the 95Mo resonances being shielded by ca 120 ppm for the ditertiary phosphine complexes. Experimental estimates of δRR(95Mo) are also reported for five-membered rings containing nitrogen and arsenic donor ligands.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260240417
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    Paper (German National Licenses)
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