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  • 1990-1994  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Laser-desorption Fourier-transform mass spectrometry of [Ta6X12]X2·8H2O, X=C1, BrContribution from the 2nd European FTMS Workshop, Antwerp, Belgium, September 1993. (1994)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 8 (1994), S. 56-58 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The gas phase of hexanuclear Ta clusters of type [Ta6X12]X2·8H2O, X=Cl, Br was investigated using laser-desorption Fourier-transform mass spectrometry. The [Ta6X12]X2- ions (m/z=1581 for X=Cl, m/z=2205 for X=Br) are the most characteristic peaks in their negative-ion laser-desorption mass spectra. Additional fragmentations observed are the result of loss of halogen and metal from [Ta6X12]X2-. Positive ions are observed only in the laser-desorption mass spectra of [Ta6Br12]Br·8H2O.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290080111
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  • 2
    Electronic Resource
    Electronic Resource
    Mass spectrometric investigation of diphenylacetylene (tolane) (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 290-292 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The electron-ionization induced fragmentation of diphenylacetylene and its d1, d2, d5 and d10 analogues has been studied by mass spectrometry. The main fragment ions found in the mass spectrum of diphenylacetylene are due to the loss of two hydrogen radicals in a stepwise process and expulsion of C2H2 from the molecular ion in parallel fragmentation pathways producing the fragment ions at m/z 176 and m/z 152, respectively, the latter having possibly a biphenylene radical cation structure. Knowing the actual composition of deuterated derivatives, and the fragmentation pattern of diphenylacetylene, the distribution of the label in these ions was calculated under the assumption that this distribution is statistical. The final results were compared with the experimentally observed spectra of deuterated compounds. This comparison favours the assumption of hydrogen randomization prior to m/z 176 and m/z 152 formation. In contrast to the loss of hydrogen radicals and of C2H2, the formation of m/z 139, 126 and 102 does not involve any major hydrogen scrambling between the phenyl rings.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290040807
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  • 3
    Electronic Resource
    Electronic Resource
    Mass spectral study of 2-adamantanone (1990)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 4 (1990), S. 500-502 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The mass spectral fragmentation of 2-adamantanone has been investigated using its specifically labelled monodeuterated derivatives (in positions 1-, 4-exo-, 4-endo-, 5- and 6-) and dideuterated derivatives (in positions 4,4- and 6,6-). The mass spectrum of 2-adamantanone is generally poor in fragments showing the molecular ion as the base peak, the characteristic m/z 117, 104, 93, 91, 80, 79, 72, 67 and 53 fragments, as well as an unusual loss of water. The mass spectra of deuterated compounds favours the assumption of hydrogen randomization prior to the fragmentation of the molecular ion. In contrast, the formation of [C4H8O]+·, m/z 72 does not involve any major hydrogen scrambling.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290041205
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  • 4
    Electronic Resource
    Electronic Resource
    Randomization in the fragmentation of benzophenone (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 163-166 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The hydrogen and carbon randomization in the mass spectrometric behaviour of benzophenone has been studied by deuterium and 13C-labelling. Hydrogen scrambling is involved only in the reactions of primary loss of hydrogen from molecular ions, as well as in secondary elimination of two hydrogen atoms from [M—CO]+· ions. The carbon randomization does not feature in benzophenone upon electron impact.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070210
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  • 5
    Electronic Resource
    Electronic Resource
    Mechanistic study of the decomposition reactions of azobenzene (1992)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 27 (1992), S. 1305-1310 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electron impact-induced fragmentation of azobenzenes and its d1, d2, d5, d10, and 15N analogues was studied by mass Spectrometry and ion kinetic energy spectroscopy. The main fragment ions found in the mass spectrum of azobenzene are due to two parallel stepwise processes from the molecular ion: the expulsion of N2 and two hydrogen radicals producing an ion at m/z 152 having possibly a biphenylene radical cation structure and loss of C6H5⋅ and N2. Except in the elimination of two hydrogen atoms from [M - N2]+· ions, hydrogen scrambling between the phenyl rings does not feature in azobenzene upon electron impact.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210271126
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