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  • Analytical Chemistry and Spectroscopy  (3)
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Keywords
  • Analytical Chemistry and Spectroscopy  (3)
  • Chemistry  (3)
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Years
  • 1
    Electronic Resource
    Electronic Resource
    Fourier transform ion cyclotron resonance study of the dehydrogenative polymerization of allene and propyne induced by W+ in the gas phase (1993)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 28 (1993), S. 1453-1461 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Fourier transform ion cyclotron resonance study of the gas-phase reaction of W+ with allene is reported. W+ successively dehydrogenates at least nine allene molecules, leading to the formation of a series of WC3nH2n+ ions, with WC27H18+ as the largest product observed after a reaction delay of 40 s. Starting from the third reaction, there is a competition between elimination of H2 and C2H2 at each step. The activation of propyne was also investigated and found to lead to essentially the same sequence as with allene. The reaction of W+ with 1,1-d2-allene and collision-induced dissociation spectra of product ions are used to discuss a plausible mechanism for the formation and structures of some of the species observed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210281216
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  • 2
    Electronic Resource
    Electronic Resource
    Formation and fragmentations of organometallic complexes involving aliphatic α-amino acids and transition metal cations - a plasma desorption mass spectrometry study (1995)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 172-179 
    Details
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Amino acid/transition metal chloride mixtures were studied by plasma desorption mass spectrometry. The six aliphatic α-amino acids were considered: glycine (Gly), alanine (Ala), valine (Val), leucine (Leu), isoleucine (Ile) and proline (Pro), together with four transition metal chloride salts: CoCl2, NiCl2, CuCl2 and FeCl2. Mixtures spectra show that MCat+ complexes are formed where M = amino acid and Cat = Co, Ni, Cu or FeCl. Fragmentations of MCat+ ions lead to both organometallic and organic ions. Isotopic labelling has allowed to demonstrate some fragmentation mechanisms.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jms.1190300126
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  • 3
    Electronic Resource
    Electronic Resource
    Modulation of the gas-phase reactivity of W+ by carbonyl ligands: Activation of hydrocarbons by W(CO)x+ (x=1-4) (1995)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 9 (1995), S. 1201-1209 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The gas-phase reactions of W(CO)x+ (x=1-4) with methane, ethane, propane, ethene and propene have been studied in a Fourier transform ion cyclotron resonance mass spectrometer. Virtually all reactions observed involve hydrocarbon dehydrogenation, either single or double, a reactivity similar in type to what is observed with bare W+. The most reactive ion is W(CO)2+ except for this ion, reactivity tends to diminish with increasing number of carbonyl ligands. Whenever there is sufficient internal energy available, CO detachment competes with H2 loss. This is the case for ethene and propene, and in some cases with propane. However, this is strongly dependent upon the number of carbonyl ligands in the reacting ion. In most cases, product ions are themselves reactive with the neutral, leading to reaction sequences of various lengths. These sequences end either because the metal no longer has the appropriate number of non-bonding electrons for inserting into a C—H bond with low activation energy, or because of saturation of the coordination shell around the metal.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290091223
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