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  • 1
    Electronic Resource
    Electronic Resource
    Proton NMR studies of molecular-level mobility in vulcanised and epoxidised natural rubber (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 40 (1996), S. 63-71 
    Details
    ISSN: 0959-8103
    Keywords: NMR ; relaxation ; rubber ; vulcanisation ; epoxidisation ; additives ; mobility ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Proton spin-lattice relaxations in the laboratory and rotating frames, together with transverse relaxation (free induction decay), have been measured for natural and epoxidised rubber, plus a series of vulcanised samples. The data have been analysed by fitting procedures to give characteristic times which are discussed in terms of the mobility of the various parts of the samples, and of their compositions (including the effects of paraffin wax and oil additives). Interpretation has been aided by recording free induction decays following a period of spin-locking. Carbon-13 magic-angle spinning spectra have also been measured.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 2
    Electronic Resource
    Electronic Resource
    Carbon-13 NMR investigations of three fluorinated steroids (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. 501-505 
    Details
    ISSN: 0749-1581
    Keywords: NMR ; solid-state NMR ; 13C NMR ; magic angle spinning ; steroids ; fluorinated compounds ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: High-resolution carbon-13 NMR spectra were obtained for three solid fluorinated steroids. Assignments were carried out using several approaches, including two-dimensional spectra of the compounds in solution. Solid-state and solution-state chemical shifts are compared. Signals from one of the fluorine-containing carbons in each compound show the effect of interplay between shielding, dipolar and indirect scalar (J) coupling tensors. One sample is found to be a mixture of two polymorphic forms.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260330702
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  • 3
    Electronic Resource
    Electronic Resource
    Lithium-7 and lithium-6 NMR studies of solid complexes of lithium tetrahydroborate (1994)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 32 (1994), S. 166-172 
    Details
    ISSN: 0749-1581
    Keywords: NMR ; Lithium-7 ; Lithium-6 ; Magic angle spinning ; Quadrupolar interactions ; Tetrahydroborate complexes ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lithium-7 and lithium-6 spectra were obtained for four solid air-sensitive complexes of LiBH4 under both magic angle spinning (MAS) and static conditions. The MAS experiments were carried out using a specially designed rotor insert to prevent degradation of the sample. The spectra yield semi-quantitative information about the magnitude of the quadrupolar coupling constants, but some structure in the static spectra cannot be fully explained. Chemical shift variations are, as expected, modest. Only a single MAS centreband is seen in each case, suggesting that there is only one lithium atom in the asymmetric unit.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260320305
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  • 4
    Electronic Resource
    Electronic Resource
    79,81Br effects in the high-resolution 13C NMR spectra of solid bromoaromatic compounds: Dipolar and indirect (79,81Br, 13C) interactions studied by ‘Inverse’ first-order perturbation theory (1995)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 33 (1995), S. 603-606 
    Details
    ISSN: 0749-1581
    Keywords: NMR ; solid-state NMR ; magic angle spinning ; quadrupolar interactions ; perturbation theory ; bromine-carbon coupling ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Splittings in the 13C cross-polarization magic angle spinning spectra of 1, 4-dibromobenzene and 4-bromo-3, 5-dimethylpyrazole are reported. They arise from (79,81Br, 13C) interactions influenced by the quadrupolar nature of the bromine nuclei. They are analysed using both ‘inverse’ perturbation and exact theories to yield data on both isotropic and anisotropic coupling, including the signs. The spectra also enable the sign of the bromine quadrupole coupling constant to be confirmed as positive.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1260330720
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