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  • Chemistry  (16)
  • Wiley-Blackwell  (16)
  • Springer
  • 1980-1984  (6)
  • 1970-1974  (10)
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  • Wiley-Blackwell  (16)
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  • 1
    Electronic Resource
    Electronic Resource
    Photooxidation von Leukofarbstoffen. VIII. Kurzzeitspektroskopische Untersuchungen zum Mechanismus der Photooxidation von Leukokristallviolett (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 899-909 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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).
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260607
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  • 2
    Electronic Resource
    Electronic Resource
    Direkte und sensibilisierte Photoisomerisierung der α,δ-PhenylfulgideXIII. Mitt. zur Photochemie der Fulgide; XII. Mitt. s. [1] (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 705-720 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260502
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  • 3
    Electronic Resource
    Electronic Resource
    Über die Photochromie der Fulgide. IX VIII. Mitt.: M. Reichenbächer, H.-D. Ilge u. R. Paetzold, Z. Chem. 20, 188 (1980) Untersuchungen zur Photochemie des α-3,5-Dimethyoxyphenyl-δ-δ-dimethylfulgids (1981)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 367-380 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19813230304
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  • 4
    Electronic Resource
    Electronic Resource
    Photooxidation von Leukofarbstoffen. III. Sensibilisierte Photooxidation von LeukofluoreszeinHerrn Prof. Dr. Dr. h. c. H. G. O. Becker zum 60. Geburtstag gewidmet (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 46-52 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240107
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  • 5
    Electronic Resource
    Electronic Resource
    13C-kernmagnetische Resonanzspektren der PhenylfulgideXI. Mitt. zur Photochemie der Fulgide; X. Mitt. s. [1]. (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 222-232 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260206
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  • 6
    Electronic Resource
    Electronic Resource
    Elektronische und sterische Substituenteneinflüsse auf die UV/VIS-Absorptionsspektren der PhenylfulgidisomerenXII. Mitt. zur Photochemie der Fulgide, XI. Mitt. s. [1] (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 233-247 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 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.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260207
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen an Selenverbindungen. LVI. Dimethylselenoxidkomplexe von 4f-Metallperchloraten (1971)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 385 (1971), S. 256-260 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Complexes with the general formula [M(DMeSeO)8](ClO4)3 of the above given 4f ions are prepared. IR and RAMAN spectra indicate coordination of the DMeSeO-molecules via the oxygen atom. The coordination polyeder is probably a distorted antiprismatic structure with the point group D4. The magnetic moments correspond to those of the free 4f ions.
    Notes: Durch Umsetzung von (CH3)2SeO = DMeSeO mit den Perchloraten M(ClO4)3 (M = Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb) wurden Komplexe der Zusammensetzung [M(DMeSeO)8](ClO4)3 isoliert. Aus den IR- und RAMAN-Spektren folgt Koordination der acht DMeSeO-Molekeln über die Sauerstoffatome an die 4f-Ionen. Für das Koordinationspolyeder wird eine verzerrte antiprismatische Struktur der Punktgruppe D4 wahrscheinlich gemacht. Die magnetischen Momente entsprechen denen der freien 4f-Ionen.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19713850307
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  • 8
    Electronic Resource
    Electronic Resource
    Untersuchungen an Selen-Verbindungen. LXVIII. Die Ultrarotspektren des Seleninyl-N, N′-äthylendiamids und des Seleninyl-bis-(methylamids) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 403 (1974), S. 137-142 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Selenium Compounds. LXVIII. Infrared Spectra of (CH2NH2)SeO and (CH3NH)2SeOThe infrared spectra of the compounds (CH2NH)2SeO and (CH3NH)2SeO are presented and assigned by comparison with analogous compounds. The bond relations in both amides are discussed. Strong intermolecular hydrogen-bonds are formed between the Se =O and NH bond.
    Notes: Die Infrarotspektren der Verbindungen (CH2NH)2SeO und (CH3NH)2SeO werden mitgeteilt und über den Vergleich mit analogen Verbindungen zugeordnet. An Hand der IR-Spektren werden die Bindungsverhältnisse beider Verbindungen diskutiert. Die SeO-Bindung bildet mit der NH-Bindung starke intermolekulare Wasserstoffbrückenbindungen.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744030206
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  • 9
    Electronic Resource
    Electronic Resource
    Untersuchungen an Molekülkomplexen. IV. Über Molekülkomplexe des Jods mit Oxoverbindungen. Zusammenhänge zwischen der Komplexstabilität, der Blauverschiebung der Jodbande und der Valenzkraftkonstanten der Donatorbindung (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 405 (1974), S. 129-138 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Molecular Complexes. IV. Molecular Complexes of Iodine with Oxo-Compounds. Relations between Complex Stability, the Blue Shifting of the Iodine Band, and the Valence Force Constants of the Donor BondI2 molecules from 1:1 complexes with phosphoryl, thionyl and seleninyl compounds. The increase of the wave number of the visible iodine band which occurs on complex formation (blue shift) correlates linear with the free molar standard enthalpy of complex formation and with the ZO valence force constant of the donor molecule. These relations are discussed.
    Notes: J2 bildet mit Phosphoryl-, Thionyl- und Seleninylverbindungen in CCl4 1:1-Komplexe. Die bei der Komplexbildung eintretende Wellenzahlerhöhung der sichtbaren Jodbande (Blauverschiebung) korreliert linear mit der freien molaren Standard- enthalpie der Komplexbildung und auch mit der Valenzkraftkonstanten der ZO-Donator-bindung. Diese Zusammenhänge und ihre Nützlichkeit werden diskutiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744050202
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  • 10
    Electronic Resource
    Electronic Resource
    Untersuchungen an Selen-Verbindungen. LXIV. Darstellung und Eigenschaften von Säurederivaten von Phenylselen(IV) -Verbindungen (C6Hs) 2SeX2, (C6H5) 3SeX (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 398 (1973), S. 186-192 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Studies on Selenium Compounds. LXIV. Preparation and Properties of Acid Derivatives of Phenylselenium(IV) Compounds (C6H5) 2SeX2 and (C6H5) 3SeX.Reactions of (C6H5) 2SeBr2 and (C6H5) 3SeCl with silver salts of acids are investigated. From (C6H5) 2SeBr3 and AgY (Y = N03, CH3CO3, CF3CO2, 1/2 SO4, CH3SO3, NCO) the compounds (C6H5) 2Se(NO3) 2 (C6H5) 2Se(CH3CO2) 2, (C6Hs) 2Se(CF3CO2) 2, (C6H5) 2SeSO4, (C6H5) 2Se(CH3SO3) 2 and (C6H5) 2Se(NCO) 2 are prepared. They are characterized by solubility, molecular weight and conductivity. Reaction of (C6H5) 3SeCl and AgX (X = NO3, CH3CO2) yields (C6H5) 3SeNO3 and (C6H5) 3SeCH3CO2.
    Notes: Es wird das Reaktionsverhalten von (CsHs) 2SeBr2 und (C6H5) 3SeCl mit Silbersalzen von Säuren untersucht. Aus (C6H5) 2SeBr3 und AgY (Y = NO3, CH3CO2, CF3CO2, 1/2 SO4, CH3SO3, NCO) werden (C6H5) 2Se(NO3) 2 (C6H5) 2Se(CH3CO2) 2, (C6Hs) 2Se(CF3CO2) 2, (C6H5) 2SeSO4, (C6H5) 2Se(CH3SO3) 2 und (C6H5) 2Se(NCO) 2 dargestellt. Die Verbindungen werden durch ihr Löslichkeitsverhalten, durch ihre hydrolytische und thermische Beständigkeit sowie durch ihre Molmasse und ihre Leitfähigkeit charakterisiert. (C6H5) 3SeCl reagiert mit AgX (X = NO3, CH3CO2) zu (C6H5) 3SeNO3 und (C6H5) 3SeCH3CO2.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733980212
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