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  • Analytical Chemistry and Spectroscopy  (18)
  • 1
    Electronic Resource
    Electronic Resource
    Enhanced mass resolution in a quadrupole ion trap (1993)
    New York, NY : Wiley-Blackwell
    Rapid Communications in Mass Spectrometry 7 (1993), S. 43-45 
    Details
    ISSN: 0951-4198
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The versatility of the quadrupole ion trap as a mass spectrometer in which the mass resolution may be varied over a wide range has been demonstrated. Mass resolution of 0.8 × 107 and 1.2 × 107 have been obtained for ions of m/z 414 and m/z 614, respectively, well in excess of the normal value of 3m, where m is the mass of ion. At the highest mass resolution, peak-widths at half-maximum are but 52 × 10-6 u. While it has been shown previously that enhanced mass reslution in the quadrupole ion trap can be achieved by reduction of the mass scanning rate, the range of mass resolutions reported here were achieved by reducing the mass scanning rate, in stages, by an overall factor of ca 5.5 × 104.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/rcm.1290070111
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  • 2
    Electronic Resource
    Electronic Resource
    Proton magnetic resonance spectra of monosubstituted naphthalenes (1976)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 8 (1976), S. 137-140 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chemical shifts and coupling constants for the ring protons of fourteen monosubstituted naphthalenes in carbon tetrachloride solution have been obtained by analysis and computer simulation of their 100 MHz magnetic resonance spectra. Studies at several concentrations have enabled shifts extrapolated to infinite dilution to be obtained and concentration effects arising from solute-solute interactions to be determined.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270080307
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  • 3
    Electronic Resource
    Electronic Resource
    A revised assignment of the 13C NMR spectra of α- and β-pinenes (1983)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 21 (1983), S. 108-110 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: α-Pinene and β-pinene 13C enriched at the C-10 position were prepared by an unambiguous synthesis. 13C NMR spectral analysis provided evidence for a revised assignment for α-pinene at the C-9 and C-10 carbon atoms.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/omr.1270210206
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  • 4
    Electronic Resource
    Electronic Resource
    1H, 13C and 29Si NMR spectra of allylic trimethylsilanes (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 556-560 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemical shift and scalar coupling constant data have been obtained for the 1H, 13C and 29Si nuclei in allyl, methally, cis- and trans-crotyl, cis-2-methyl-2-butenyl and 3-methyl-2-butenyl derivatives of trimethylsilane.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220907
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  • 5
    Electronic Resource
    Electronic Resource
    Multinuclear NMR spectra of (CH3)3SnCH2M(CH3)3 (M=Sn, Ge, Si, C) and some halogenated derivatives (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 280-285 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chemical shift and scalar coupling constant information has been obtained from the 1H, 13C, 29Si and 119Sn NMR spectra of a series of compounds (CH3)3SnCH2M(CH3)3, where M = Sn, Ge, Si or C and with one or two CH3—(Sn) groups replaced by Cl, Br or I. The (CH3)3M and (CH3)3MCH2 groups appear to have opposite substituent effects on chemical shifts.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220503
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  • 6
    Electronic Resource
    Electronic Resource
    Proton magnetic resonance spectra of some disubstituted naphthalenes (1977)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 10 (1977), S. 112-114 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chemical shifts and coupling constants for the ring protons of nine disubstituted naphthalenes (mainly halogenonitre compounds) in carbon tetrachloride solutions have been obtained by analysis and computer simulation of their 100 MHz magnetic resonance spectra. Substituent effects are essentially additive except when a strong π-donor group is in direct conjugation with a strong π-acceptor group.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270100127
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  • 7
    Electronic Resource
    Electronic Resource
    Mercury-199 NMR chemical shifts in substituted diphenylmercury and phenylmercuric chloride (1981)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 17 (1981), S. 26-27 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of substituents on the 199Hg chemical shifts of some Ar2Hg and ArHgCl species in 1:1 CDCl3: CH2Cl2 and in CDCl3: DMSO solutions is reported. The effects are substantial and are in the direction of electron withdrawal producing increased shielding (i.e. shifts towards higher field).
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270170107
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  • 8
    Electronic Resource
    Electronic Resource
    Barriers to rotation of the dimethylamino group in some 2-amino-4-(N,N-dimethylamino)pyrimidines (1982)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 20 (1982), S. 274-275 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The free energy of activation for rotation about the exocyclic C—N bond of the dimethylamino group of some 6-substituted 2-amino-4-(N,N-dimethylamino)pyrmidines has been determined using 1H NMR line shape analysis. The results are discussed in terms of the relative electron-withdrawing and electron-releasing effects of the substituents.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270200416
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  • 9
    Electronic Resource
    Electronic Resource
    Specific and stereospecific water eliminations in the mass spectra of bicyclo[3.3.1]nonanols (1973)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 7 (1973), S. 1137-1152 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: By the use of site-specific and stereospecific deuterium labelling, it has been possible to show that loss of the elements of water from all possible bicyclo[3.3.1]nonanols (I to V) in the mass spectrometer, takes place in a substantially stereospecific manner. The position of abstraction of the hydrogen atom by the hydroxyl group can be related to the proximity effects that are present in the ground state conformers, while the [M]+ / [M - H2O]+ ratio appears to depend on the minimum H--OH intramolecular distance in the more stable conformations.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210071003
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  • 10
    Electronic Resource
    Electronic Resource
    Positive and negative ion chemical ionization mass spectrometry of pyrethrin pesticides (1986)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1986), S. 677-680 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using both positive and negative ionization we report the methane chemical ionization mass spectra of technical grade pyrethrin samples. Preferred fragmentation modes involved cleavage around the ester oxygen single bond with one fragment appearing in the positive, and the other in the negative ionization mass spectrum with their sum being equal to the molecular weight of the pyrethrin. Using pulsed positive ion negative ion chemical ionization mass spectrometry we were able to quantify trans-permethrin at the low pg level of detection.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200131207
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