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  • Wiley-Blackwell  (25)
  • Nature Publishing Group  (1)
  • 1980-1984  (7)
  • 1960-1964  (19)
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  • 1
    Digitale Medien
    Digitale Medien
    [s.l.] : Nature Publishing Group
    Nature 295 (1982), S. 688-690 
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Although the interpretation of results from granulometric experiments is controversial7, there is agreement on the following basic points: (1) A sample with multi-domain pure magnetite as the magnetic mineral will generally show /r//max - 0.2 with approximate doubling of coercivity as the ...
    Materialart: Digitale Medien
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  • 2
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 899-909 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Photooxidation of Leuco Dyes. VIII. Time Resolved Investigations of the Mechanism of the Photooxidation of Leucocrystal VioletThe photooxidation of leucocrystal violet has been reexamined by means of conventional and laser flash photolysis as well as spin trap experiments. Three radical transients have been observed and assigned to the cation radical (λmax ≈ 490, 530 nm), the neutral radical with one—NCH3—CH2 moiety (λmax ≈ 480 nm) and the triphenyl methyl radical derivative (λmax ≈ 400 nm).
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
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  • 3
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 705-720 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Direct and Sensitized Photoisomerization of α,δ-PhenylfulgidesThe photoreactions starting from the E- and E-E-isomers of mono-, di-, tri- and tetra-(substituted-)phenylfulgides are investigated. The phenylfulgides show strong steric interactions in the molecular framework. For that reason internal conversion is the main deactivation process which increases in the series of mono-, tri- and tetraphenylfulgides. The α,δ-di-(substituted-)-phenylfulgides show the highest photoreactivity. At room temperature in no case luminescence is observed from any E(E-E)-, Z(E-Z, Z-E)- or Z-Z-phenylfulgid isomer of the substances under study. Intersystem crossing cannot compete neither with thermal deactivation nor can it be observed by applying both the internal and external heavy atom effect. The phenylfulgides show typical ππ*-photoreactivity: in the singlet state E-Z-isomerization about one double bond competes with electrocyclic ring closure; in the triplet state only simultaneous E-Z-isomerization about the two double bonds is observed. The steric and electronic substituent influences on the photoreactivity are interpreted. A first qualitative model of the isomerization reactions of the fulgides in the excited states is established.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 4
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 76 (1964), S. 992-993 
    ISSN: 0044-8249
    Schlagwort(e): Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
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  • 5
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The Photochromism of Fulgides. IX. Investigations of the Photochemistry of α-3,5-Dimethoxyphenyl-δ,δ-dimethylfulgideThe mechanism of photoisomerization of α-3,5-dimethoxyphenyl-δ, δ-dimethylfulgide was investigated by means of u.v./vis- and fluorescence spectroscopy. The quantum yields of E-Z isomerization and cyclisation were determined in various solvents and at different temperatures. Triplet sensitization of E-Z isomerization by several sensitizers has been found. The thermal dark reactions of the deep coloured species were reinvestigated.
    Zusätzliches Material: 9 Ill.
    Materialart: Digitale Medien
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  • 6
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 46-52 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Photooxidation of Leuco Dyes. III. Sensitized Photooxidation of Leuco FluoresceinQuantum yields of the sensitized photooxidation of leuco fluorescein are reported. Fluorescein and benzophenone were found to be efficient sensitizers of photooxidation of leuco fluorescein. There is a characteristic dependence of quantum yields on concentration of leuco fluorescein and oxygen in the solution. The results are discussed on the basis of reaction scheme proposed for the sensitized formation of fluorescein.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 7
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 222-232 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Carbon-13 Nuclear Magnetic Resonance Spectra of PhenylfulgidesThe carbon-13 chemical shifts are determined in a series of phenylfulgides in order to investigate steric and electronic influences of substituents. By means of the shift differences between suitably substituted compounds results can be obtained as to the relative variation of the rotation angles of the phenyl rings as well as to te angle alterations between the exocyclic double bonds and the anhydride ring. Introducing 4-CH3O- and 4-NO2-groups at the phenyl rings the substituent induced alterations of the carbon-13 chemical shifts and the π-polarization effects related with it are discussed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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  • 8
    Digitale Medien
    Digitale Medien
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 233-247 
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Electronic and Steric Substituent Influences on the U.V./VIS-Absorption Spectra of Phenylfulgide IsomersThe u.v./vis spectral data of a large number of phenylfulgides (E-, Z-, E-E-, E-Z-, Z-E-, Z-Z-isomers, 1.8a-dihydronaphthalenes) are presented. An increase of the number of phenyl rings as well as substitution of the phenyl rings cause correlatable bathochromic spectral shifts. Steric influences became obvious by introducing methyl groups, by coplanarization of phenyl groups and in the series of isomers. By means of PPP calculations shifts in position and/or intensity of absorption bands are ascribed to the substituent effects.The calculated band polarization of E(E-E)-isomers are in agreement with the results of polarization spectra in oriented liquid crystal mesophases. The polarization spectra allow the assignment of the longwave absorption band to the S2 ← S0 and S1 ← S0 electronic transitions for E-E-Isomers with a C2v-symmetry.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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  • 9
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: It is shown by Raman spectroscopic investigations, that HOSeO′3 and Se2O′7-ions are converted in alcoholic solutions to soluble alkyl selenates. Raman and IR spectra of the following compounds are given and discussed: CH3OSeO3Na,  - K,  - NH4; C2H5OSeO3Na,  - K,  - NH4. The force constants of CH3OSeO′3 and HOSeO′3 ions are calculated. Their knowledge allows an estimation of the bond properties in CH3OSeO′3, HOSeO′3 and CH3OSO′3 ions. It is supposed that ethyl selenate ions exist in solution in two rotationally isomeric configurations caused by hindered rotation of the CH3 group.
    Notizen: Mit Hilfe der Raman-Spektroskopie wird gezeigt, daß Hydrogenselenationen und Diselenationen in alkoholischen Lösungen als Alkylselenationen vorliegen. Es folgt die Mitteilung und Zuordnung der Raman- und IR-Spektren der Verbindungen CH3OSeO3Na,  - K,  - NH4 und C2H5OSeO3Na,  - K,  - NH4. Die Kraftkonstanten des CH3OSeO′3 und des HOSeO′3-Ions werden berechnet. Ihre Kenntnis erlaubt eine Beurteilung der Bindungsverhältnisse in CH3OSeO′3-, HOSeO′3- und CH3OSO′3-Ionen. Äthylselenationen existieren in Lösung vermutlich in zwei rotationsisomeren Konfigurationen, verursacht durch behinderte Drehbarkeit der CH3-Gruppe.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
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  • 10
    Digitale Medien
    Digitale Medien
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 303 (1960), S. 79-84 
    ISSN: 0044-2313
    Schlagwort(e): Chemistry ; Inorganic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: RAMAN and IR-spectra of (CH3O)2SeO, (C2H5O)2SeO, and CH3O · SeO · OC2H5 are given and discussed. Because of the fact that couplings between the CH-oscillations within the alkyl groups and between CH-oscillations and that of the C—O—-Se-sceletons are allowed to be neglected, it is possible to discuss the spectra.
    Notizen: Es werden die RAMAN- und IR-Spektren von Dimethylselenit, Diäthylselenit und Methyläthyselenit mitgeteilt und diskutiert. Kopplungen zwischen den Alkylschwingungen der einzelnen Molekeln einerseits und zwischen den Alkylschwingungen und denen der COSe-Gerüste andererseits sind vernachlässigbar klein. Dadurch ist die Zuordnung der Gerüstfrequenzen möglich.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
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