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  • Analytical Chemistry and Spectroscopy  (4,318)
  • LUNAR AND PLANETARY EXPLORATION  (3,213)
  • 1980-1984  (7,531)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    10th International mass specrtometry conference (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Mass Spectrometry Reviews 3 (1984), S. 588-588 
    Details
    ISSN: 0277-7037
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mas.1280030406
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  • 2
    Electronic Resource
    Electronic Resource
    119Sn spin-lattice relaxation times and nuclear Overhauser enhancement factors in some organotin compounds (1982)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 20 (1982), S. 170-174 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Dipole-dipole relaxation via non-bonded protons is an important relaxation mechanism for119Sn in tri-n-propyltin and tri-n -butyltin compounds. This causes a negative nuclear Overhauser effect, arising from the negative magnetogyric ratio, which in some cases nulls the signal. The relative contributions from the spin-rotation and dipole-dipole mechanisms vary: larger molecules have lower spin-rotation and higher dipolar relaxation rates. The practical significance of large nuclear Overhauser enhancement factors in recording 119Sn spectra and the relation of the dipole-dipole contribution to the molecular motion and of the spin-rotation contribution to the absolute shift scale for 119Sn are discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270200312
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  • 3
    Electronic Resource
    Electronic Resource
    11B—13C coupling constant in LiB(CH3)4 (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 14 (1980), S. 76-77 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Coupling constants between 11B and 13C, 13C and 1H, and 11B and 1H were obtained for LiB(CH3)4 in 1,2-dimethoxyethane, in which the anion B(CH3)4- is belived to exist as a separate ion pair. The correlations of the coupling constants with the effective nuclear charge of boron, and with the s character of the B—C bond, are discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270140119
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  • 4
    Electronic Resource
    Electronic Resource
    13C and 15N NMR spectra of 4-substituted-1-dimethylphosphonopiperazines (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 127-128 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C and 15N NMR chemical shifts and 13C-31P and 15N-31P coupling contants are reported for a series of ten 4-substituted-1-dimethylphosphonopiperazines.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220216
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  • 5
    Electronic Resource
    Electronic Resource
    13C and 15N NMR study of acyclic vicinal diastereoisomers. Conformational effects (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 14 (1980), S. 214-219 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conformations of aliphatic diastereoisomers with vicinal asymmetric centers (2,3-disubstituted butanes and 5,6-disubstituted n-decanes) are discussed in terms of their 13C and, in some cases, 15N chemical shifts and spin-lattice relaxation times. Solvent and protonation effects are explained by conformational changes in the isomers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270140313
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  • 6
    Electronic Resource
    Electronic Resource
    13C and 15N spin-lattice relaxation and chemical shift studies of pentane-2,4-diamine (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 131-135 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C and 15N NMR chemical shift and spin-lattice relaxation data have been measured for both meso- and racemic-pentane-2,4-diamine. At high pH (12), relaxation is consistent with hindered rotation of the NH2 group due, in part, to the formation of intramolecular hydrogen bonds. At low pH (2), relaxation is consistent with relatively unhindered rotation of the NH3+ group. Rotational jump rates and barriers are reported, determined from the NT1 ratios between 15N and 13C nuclei. In all cases, the ratios for the racemic diastereomer are higher than those of the meso compounds; this is interpreted in terms of conformationally more stable intramolecular hydrogen bond formation in the meso compound. Chemical shifts for the diastereomeric amines show that 15N shifts move downfield on protonation along with methyl and methylene carbons, while the methine carbon resonances move upfield.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220302
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  • 7
    Electronic Resource
    Electronic Resource
    13C and 17O chemical shifts and conformational analysis of mono- and di-methyl-substituted thiane 1-oxide and thiane 1,1-dioxide (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 402-407 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C and 17O (natural abundance) chemical shifts of several mono- and di-methyl ring-substituted thiane 1-oxides and thiane 1,1-dioxides are reported. The cis and trans isomers of methyl-substituted thiane 1-oxide are readily identified by 13C and 17O NMR. In particular, the 17O NMR signals of axial SO groups are found several ppm upfield of those of the equatorial counterparts. The proportion of axial and equatorial conformers of thiane 1-oxide in different solvents has been measured by low-temperature 13C NMR. In THF the proportion of the axial conformer is higher than in CD2Cl2 whereas in CDCl3 or CHF2Cl the conformational preference is reversed and the equatorial conformer is slightly favoured.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220612
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  • 8
    Electronic Resource
    Electronic Resource
    13C and 1H chemical shifts in 2-benzylidene[3]ferrocenophane-1,3-diones. Elucidation of the substituent dependence of carbonyl chemical shifts in different carbonyl derivatives (1983)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 21 (1983), S. 429-432 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C and 1H chemical shifts of the ferrocene moiety, as well as the carbonyl carbons and styrene moiety, of substituted 2-benzylidene[3]ferrocenophane-1,3-diones have been assigned. Correlations of 13C substituent chemical shifts of both carbonyl carbons with the Hammett constants have been found, and the effect of the transmission of substituent effects on these chemical shifts through the styrene moiety is discussed. An explanation is given for the different sensitivities of the carbonyl carbon chemical shifts to the electronic effect of substituents in mono- and dicarbonyl derivatives.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/omr.1270210706
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  • 9
    Electronic Resource
    Electronic Resource
    13C and 1H NMR investigation of the structure of N″-sulphonyl-N-alkylideneformamidrazones (1980)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 14 (1980), S. 133-137 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C and 1H NMR spectra of N″-sulphonyl-N-alkylideneformamidrazones have been recorded and the chemical shifts assigned. The tautomeric structure proved to be an N2- alkylidenehydrazide sulphonylimide. The barrier to rotation around the CN1 bond was estimated from variable from temperature 1H NMR measurements, and the Z/E ratio and its solvent dependence was investigated.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270140211
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  • 10
    Electronic Resource
    Electronic Resource
    13C and 1H NMR spectral studies of N-alkylmethylquinolinium salts (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 323-327 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C and 1H chemical shifts of fourteen N-alkylmethylquinolinium salts in DMSO-d6 are reported, and compared with those of the eleven corresponding methylquinoline bases. The influence of ring substitution by methyl groups in the salts and substitution at the nitrogen atom and the effect of the anion are discussed.
    Additional Material: 7 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220510
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