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  • 1
    Electronic Resource
    Electronic Resource
    Zum thermischen und photochemischen Reaktionsverhalten der Triplettarylnitrene (1992)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 334 (1992), S. 707-710 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal and Photochemical Behaviour of Triplet ArylnitrenesThe photolysis of phenyl azide, p-nitrophenyl azide and p-methoxyphenyl azide (77 K) yielding the corresponding nitrenes and further paramagnetic intermediates was investigated using u.v. and e.p.r. spectroscopy. After warming up to room temperature the photolyzed solutions were analyzed by h.p.l.c.The formation of triplet nitrene is proved by the respective e.p.r. signals. Depending on the excitation wavelength at 77 K it is possible to excite the thermally stable triplet nitrenes. The electronically excited triplet nitrenes react with the solvent or with the matrix forming the corresponding primary aniline.The radicals (e.g. formyl) observed at longer irradiation times are the result of the photolysis of the formed aniline.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19923340812
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  • 2
    Electronic Resource
    Electronic Resource
    Untersuchung der spektroskopischen und elektrochemischen Eigenschaften 9, 10-arylsubstituierter Anthracene. I. Ergebnisse von UV- und ESR-spektroskopischen sowie elektrochemischen Messungen (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 620-628 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die elektrochemische Reduktion und Oxydation von Diphenylanthracen (DPA) und Dibiphenylylanthracen (DBPA) wurde untersucht und dabei gezeigt, daß es sich bei der Bildung der Kationen und Anionen um reversible Elektrodenprozesse handelt. Die UV-Spektren des DPA und DBPA sowie die Hyperfeinstruktur der Radikalionen des Anthracens, DPA und DBPA werden angegeben. Die experimentell bestimmten Kopplungskonstanten werden mit HMO-Daten verglichen. Die Ergebnisse zeigen ähnliche elektrochemische und spektroskopische Eigenschaften für DPA und DBPA.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150406
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  • 3
    Electronic Resource
    Electronic Resource
    Untersuchungen der spektroskopischen und elektrochemischen Eigenschaften 9,10 -arylsubstituierter Anthracene. II. Diskussion des elektrochemischen und sterischen Verhaltens (1973)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 315 (1973), S. 629-639 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Experimentell ermittelte UV-, ESR- und elektrochemische Daten arylsubstituierter Anthracene werden an Hand von Modellrechnungen und Literaturdaten diskutiert. Dabei kann gezeigt werden, daß diese Eigenschaften im wesentlichen durch die Molekülgeometrie, hier repräsentiert durch Verdrillungswinkel, bestimmt werden. Ein spezifischer Einfluß der Arylsubstituenten auf die elektronischen Eigenschaften des Grundkörpers konnte nicht nachgewiesen werden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19733150407
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  • 4
    Electronic Resource
    Electronic Resource
    Bestimmung der Nullfeldparameter optisch angeregter 3(π,π*)-Zustände ausgewählter aromatischer Systeme (1982)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 324 (1982), S. 761-768 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Determination of the Zero Field Parameters Optically Excited 3(π,π*)-States in Selected Aromatic SystemsExperimental zero field parameters of optically excited naphthalene and quinoxaline derivatives are presented. The (D*), (D) and (E) parameters are determined by the position of the transitions by means of simple approximation formula, magnetophotoselection and simulation of spectra. Possibilities of comparison of the zero field parameters of optically excited 3(π,π*)-states with parameters of ground state for simple aromatic hydrocarbones are presented.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19823240509
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen der spektroskopischen und elektrochemischen Eigenschaften 9,10-arylsubstituierter Anthracene. IVTeil I, II, III s. [11], [2], [4].. Diskussion der 1H- und 13C-NMR-Spektren 9,10-arylsubstituierter Anthracene (1975)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 317 (1975), S. 591-600 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wurden die 1H- und 13C-NMR-Spektren einer Reihe 9,10-disubstituierter Anthracene aufgenommen. Der Einfluß der Substituenten auf die gemessenen 1H-NMR-Verschiebungen und Kopplungskonstanten wird diskutiert. Die Mehrzahl der 13C-NMR-Signale konnte unter Hinzuziehung von 13C-EPR-Kopplungskonstanten, polarographischen Halbstufenpotentialen und HMO-Daten zugeordnet werden. Insgesamt kann festgestellt werden, daß die 1H- und 13C-NMR-Spektren innerhalb des Modells übereinstimmende Aussagen über die elektronische Struktur der untersuchten Verbindungen liefern.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19753170411
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  • 6
    Electronic Resource
    Electronic Resource
    Elektronenstruktur konjugierter Sulfone SCF-π-Elektronenberechnungen mit expliziter Berücksichtigung der d-Orbitale (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 177-185 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Electronic Structure of Conjugated Sulfones SCF-π-Electron Calculations Explicitly Taking into Account d-OrbitalsThe model proposed by DE JONG and JANSSEN in order to treat the interaction between the sulfon group and adjacent π electron centers within the HÜCKEL approximation is extended to the PPP method. Parameters are given which are consistent with those known for other substituents. Charge distributions and electronic spectra are calculated for some substituted phenylsulfones and styrylsulfones and compared with the corresponding experimental data (13C n.m.r. chemical shift and u.v. spectra, respectively).
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210202
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  • 7
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Struktur von Kupferkomplexen der 2,4-Dichlorphenoxyessigsäure (1980)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 322 (1980), S. 321-326 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Investigations about the Structure of Copper Complexes from 2,4-Dichlorphenoxyacetic Acid
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19803220219
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  • 8
    Electronic Resource
    Electronic Resource
    On the Nature of Manganese Ions in the β-Ca2 SiO4 Structure Detected by High Field ESR (1992)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 607 (1992), S. 183-187 
    Details
    ISSN: 0044-2313
    Keywords: β-dicalcium silicate ; manganese ions ; high field ESR ; ESR fine-and hyperfine structure transitions ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zum Einbau von Manganionen in die β-Ca2 SiO4-Struktur. Eine Hochfeld-ESR-StudieDie Stabilisierung der β-Dicalciumsilicat-Struktur durch Dotierung mit Mangan wurde mit Hilfe der ESR im X-Band (3,2cm) und Q-Band (8mm) und der Hochfeld-ESR (W-Band (2m)) untersucht. Bei kleinen Mn-Gehalten erfolgt der Einbau der Manganionen als Mn2+ auf Gitterplätze geringer Verzerrung. Die Erhöhung des Mn-Gehaltes verstärkt den stabilisierenden Effekt und es resultieren zusätzlich Feinstrukturmultipletts von Mn2+ -und Mn4+-Ionen, die axial bzw. rhombisch verzerrte Plätze der Dicalciumsilicat-Struktur besetzen. Die bezüglich Konzentration und Ladungszustand variable Substitution im Kationengitter steht offensichtlich im Zusammenhang mit einem Abbau von Ladungs- bzw. Bindungslängendiskrepanzen bei der Kristallisation der undotierten Verbindung und eröffnet damit die Möglichkeit der Ausbildung regulärer Einkristalle.
    Notes: The stabilization effect of dopants of the structure of β-dicalcium silicate using manganese in different oxidation states was investigated in detail by ESR at 3.2 cm (X-band), 8mm(Q-band) and by high field ESR at 2mm(W-band). The assignment of the signals was supported by corresponding single crystal measurements using X-Band and Q-band. If there are only low manganese concentrations on forming the microcrystallites the incorporated Mn2+ will be localized on less distorted sites of the lattice. Increasing the manganese concentration the Mn2+ spectra are superimposed by the fine structure of Mn2+ and of Mn4+ ions occupying distorted lattice sites with axial and rhombic symmetry. This pattern of the cation substitution represents the typical transition metal behaviour and obviously favours the formation of regular crystalline units from the melt on compensating of non-equivalent distances and charges.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19926070133
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  • 9
    Electronic Resource
    Electronic Resource
    EPR-Untersuchungen zur Photolyse halogenierter organischer Verbindungen. I. Reine Phasen halogenierter Verbindungen (CBr4, CHBr3, CCl4, CHCl3) (1985)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 310-316 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: EPR-Investigations on the Photolysis of Halogenated Organic Compounds I. Pure Halogenated Compounds (CBr4, CHBr3, CCl4 and CHCl3)EPR-spectra of CBr4, CHBr3 and CDBr3, exposed to u.v.-light and γ-rays respectively, are presented. They are discussed and compared with the results of the photolysis of CH2Br2, CH3Br and CCl4, CHCl2, CH2Cl2 and CH3Cl. Under stationary conditions at 77K it was possible to identify paramagnetic species like \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm CBr}_4\,^{_{\bar.}} $\end{document}, ·CBr3, ·CH3, ·C2H5, ·CCl3 and trapped electrons.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19853270216
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  • 10
    Electronic Resource
    Electronic Resource
    EPR-Untersuchungen zur Photolyse halogenierter organischer Verbindungen. II. CHBr3 und CBr4 in glasartigen und polykristallinen Matrices (1985)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 317-327 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: EPR-Investigations on the Photolysis of Halogenated Organic Compounds. II. CHBr3 and CBr4 in Glassy and Polycrystalline MatricesPhotolysis of CHBr3, CDBr3 and CBr4 in glassy and polycrystalline matrices (alcohols, diethylether, benzene derivatives and KBr) at T ≥ 77 K yields stationary e.p.r.-spectra in the range of effective g-factor from 2.2 to 1.9. By comparison of the spectra of CHBr3 and CDBr3, exposed to γ-rays and u.v. light respectively, and the spectra of these compounds in matrices it was shown that the photolysis in matrices produces the species \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm CBr}_4\,^{_{\bar.}} $\end{document}, ·CBr3 and α-Br-radicals from the halogenated compounds and HĊO, ·CH3, CH3ĊHOH, RĊHOH, and ·C2H5 from the matrix. Photolysis of halogenated compounds in CH3OH and CD3OD yields only HĊO and ·CH3 together with a very small amount of bromine-containing radicals. In all other investigated matrices the concentration of bromine containing species is controlled by physical and chemical properties of the matrix. Time development of the \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm CBr}_4\,^{_{\bar.}} $\end{document}-radical and of those generated from the matrix is different and gives insight into the complex photoreaction in solid matrices.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19853270217
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