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  • Articles  (10)
  • Analytical Chemistry and Spectroscopy  (9)
  • Best. von Organ. Säuren  (1)
  • 1970-1974  (9)
  • 1965-1969  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Separation of aliphatic and aromatic organic acids on starch thin-layers (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 270 (1974), S. 16-19 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Organ. Säuren ; Chromatographie, Dünnschicht ; aliphatisch, aromatisch, Reisstärkeschichten
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Aliphatic monocarboxylic, dicarboxylic, hydroxy, keto and amino acids were separated on rice starch thin layers with the solvent system: ethanol/water/ammonia (78∶20∶13). Different aromatic acids were separated on the same support with the solvent system: ethanol/n-butanol/water/ammonia (40∶30∶15∶15). Rf- and RM-values were determined and the validity of Martin's theoretical postulates on the relationship between chemical structure and Rf-values in partition chromatography was displayed. Calculation of group and basic constants was also carried out.
    Notes: Zusammenfassung Aliphatische Monocarbon-, Dicarbon-, Hydroxy-, Keto und Aminosäuren wurden dünnschicht-chromatographisch auf Reisstärke getrennt (Fließmittel: Äthanol/ Wasser/Ammoniak [78∶20∶13]). Verschiedene aromatische Säuren wurden auf der gleichen Schicht mit dem Fließmittel Äthanol/n-Butanol/Wasser/Ammoniak (40∶30∶15∶15) getrennt. Rf- und RM-Werte wurden bestimmt. Aufgrund der theoretischen Aufstellungen von Martin für die Beziehung zwischen Rf-Werten in der Verteilungs- chromatographie und chemischen Strukturen wurden Gruppen- und Grundkonstanten bestimmt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00595876
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  • 2
    Electronic Resource
    Electronic Resource
    Zur Weiteren Kenntnis des Chlorophylls und des Hämins - XIX. Zur McLafferty-Umlagerung in gerad- und in Ungeradelektronischen Systemen (1968)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 323-329 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: It is shown that in porphin derivatives the McLafferty rearrangement occurs preferentially in even electron systems, in fact with high relative abundance starting from M2+, but less favorably in ions formed by elimination of a radical. Starting from this observation the formulation of a general scheme for the McLafferty rearrangement is attempted.
    Notes: Es wird gezeigt, daß in Porphin-Derivaten die McLafferty-Umlagerung bevorzugt in geradelektronischen Systemen abläuft. und zwar mit großer relative Häufigkeit ausgehend von M2+, jedoch weniger begünstigt in Ionen, die durch Radikalabspaltung entstanden sind. Von dieser Beobachtung ausgehend wird ein allgemeines Schema für die McLafferty-Umlagerung vorgeschlagen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210010214
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared and Raman spectra of the spinel ZnGa2O4 (1973)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 1 (1973), S. 513-519 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A study of the infrared and Raman spectra of single crystals and powders of ZnGa2O4 yields the following k = 0 phonon frequencies: 175 cm-1 (T1u), 328 cm-1 (T1u), 420 cm-1 (T1u), 570 cm-1 (T1u), 467 cm-1 (T2g), 611 cm-1 (T2g), 638 cm -1 (Eg) and 714 cm-1 (A1g).The results are compared with the frequencies of the vibronic sidebands of the Cr3+ R line emission as observed in ZnGa2O4: Cr3+. It is found that the strogest vibronics of the R lines are due to coupling of the Cr3+ electrons with the T1u modes of the ZnGa2O4 lattice, especially with the two higher frequency T1u modes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250010510
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  • 4
    Electronic Resource
    Electronic Resource
    Light scattering from polaritons in m-dinitrobenzene single crystal (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 493-495 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman scattering from polaritons in organic biaxial crystal m-dinitrobenzene has been observed by a photographic method. In order to obtain a greater shift of polaritons the directional dispersion of the incident wave vector has been taken into account, so that the polariton disperison curves over the range from 500 cm-1 to 3500 cm-1 have been observed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020505
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  • 5
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of Lewis acid-base complexes. III: Vibrational frequencies, assignments and normal coordinate analyses for isotopic varieties of phosphine borane and trifluorophosphine borane (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 175-192 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Vibrational spectra of the two Lewis complexes, phosphine borane, PH3BH3, and trifluoro-phosphine borane, PF3BH3, have been investigated for several isotopic species preserving C3v symmetry. New assignments are proposed and substantiated by normal coordinate analyses formulated in the compliance constant basis.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020208
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  • 6
    Electronic Resource
    Electronic Resource
    Mass spectra of chloro-substituted benzophenones (1971)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 5 (1971), S. 605-613 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of all three monochloro-, seven of the dichloro- and two of the trichloro-substituted benzophenones are reported. The major fragments in the spectra are due to α-fission to oxonium ions followed by the well-known subsequent fragmentations. The ring bearing the greater number of chlorine atoms appears to cleave more readily, with 2-chloro substituents enhancing this tendency. There is evidence for the formation of the biphenylene ion in all monochloro and all dichloro compounds studied and for the formation of the chloro biphenylene ion in both trichloro compounds studied. In the case of 2,2′-, 2,4- and 3,4-dichlorobenzophenones evidence exists for hydrogen transfer between rings.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210050511
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical ionization mass spectrometry. i-Butane reactant gas modified by ethanolamine or ethylenediamine (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1974), S. 195-203 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1,2-Diaminoethane and 2-aminoethanol-1 were added to the isobutane plasma of a chemical ionization mass spectrometer. The resulting reactant gas mixture did not react with additives containing a single oxygen functional group. Addition reactions were observed with some additives containing multiple oxygen functions. Additives containing nitrogen functions were protonated by the reactant mixture. The relative proportion of protonation to addition depended on the ability of the additive to chelate the reactant ion and on the basicity of the additive. This use of 1,2-diaminoethane and 2-aminoethanol-1 provides a convenient method of varying the reactivity of the plasma in a chemical ionization source.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210090207
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  • 8
    Electronic Resource
    Electronic Resource
    Ortho effects in organic molecules on electron-impact I - Oxidation of olefinic double bond by the ortho nitro group in stilbazoles (1974)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 9 (1974), S. 1158-1160 
    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 in 2′-nitro-4-stilbazole is triggered by the oxidation of the olefinic double bond by the ortho nitro group in the initial step, while such an interaction under the same condition is totally absent in the meta and para isomers. The important fragmentation in 2′-nitro-2-stilbazole is the formation of a cyclised ion with the elimination of the nitro group.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210091113
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  • 9
    Electronic Resource
    Electronic Resource
    Conformational analysis and J(HCOH) of α-hydroxy-N-caproylhydrazobenzene, a degradation product of phenylbutazone (1970)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 341-349 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes:  - Intramolecular O—H… N hydrogen bonding between the hydroxylic and terminal amino groups of α-hydroxy-N-caproylhydrazobenzene (5) permits J(HCOH) to be observed in most solvents. The configuration and conformation of 5 are discussed and an H—C—O—H dihedral angle (φ) of 145° is calculated. Solvent effects on J(HCOH) as well as the role they appear to exert in restricting internal rotation of the phenyl substituents of 5 are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270020405
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  • 10
    Electronic Resource
    Electronic Resource
    A Czerny-Turner spectrograph incorporating a 2-stage image intensifier for the study of very weak Raman spectra (1974)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 2 (1974), S. 249-256 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A Czerny-Turner spectrograph is described in which an image intensifier is positioned in front of the photographic plate. This system shows a large gain in sensitivity over conventional spectrographs without serious loss of resolution. The reciprocity failure of this detection system is found to be very low.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250020304
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