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  • Articles  (52)
  • Inorganic Chemistry  (29)
  • Analytical Chemistry and Spectroscopy  (18)
  • Atomic, Molecular and Optical Physics  (3)
  • Chromatographie, Dünnschicht  (2)
  • 42.75
  • Surface physics, nanoscale physics, low-dimensional systems
  • 2000-2004  (2)
  • 1970-1974  (33)
  • 1915-1919  (17)
Collection
  • Articles  (52)
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  • 1
    Electronic Resource
    Electronic Resource
    Zinkstaubdestillation im Mikrogrammbereich (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 268 (1974), S. 102-108 
    Details
    ISSN: 1618-2650
    Keywords: Zinkstaubdestillation ; Ultramikrobereich, Apparatur, TAS-Verfahren. Thermofraktographie, TAS-Verfahren ; Chromatographie, Dünnschicht ; Zinkstaubdestillation, Ultramikrobereich. Analyse von Naphthalinderivaten, Anthracenderivaten, Phenanthrenderivaten, Tetracenderivaten, Indolderivaten ; Chromatographie, Dünnschicht ; Zinkstaubdestillation, TAS-Verfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird eine Methode beschrieben, die es erlaubt, unter kontrollierten Bedingungen mit 20–200 μg Ausgangsmaterial eine Zinkstaubdestillation durchzuführen. Hierzu wird die Probe auf Cu-aktiviertes Zink in einer TAS-Patrone für einige Minuten auf 350–450° C erhitzt. Die dabei entstehenden sauerstofffreien Aromaten bzw. stabilen Heterocyclen werden durch einen Stickstoffstrom von 15 ml/min direkt auf den Startpunkt einer DC-Schicht transferiert. Anschließend wird chromatographiert und die auftretenden Reaktionsprodukte werden identifiziert. Zum Studium der Reaktionsvorgänge und der optimalen Temperaturbereiche dient die Thermofraktographie. Es sind Anwendungsbeispiele aus der Gruppe der Naphthalin-,Anthracen-, Phenanthren-, Tetracen- und Indolderivate gegeben.
    Notes: Abstract A method for zinc dust distillation of 20–200 μg of substance under controlled conditions is described. The sample is heated on copper-activated zinc up to 350–450° C for several minutes in a TAS-cartridge. The resulting oxygen-free aromatic resp. the stable heterocyclic components are transferred directly to the starting point of a TLC-plate by a stream of nitrogen at 15 ml/min and identified after chromatography. Thermography is applied to study the reaction process and to determine the optimal temperature ranges. Examples of application to the groups of naphthalene-, anthracene-, phenanthrene-,tetracene- and indol derivatives are listed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00431149
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  • 2
    Electronic Resource
    Electronic Resource
    Padé approximants to physical properties via inner projections (1973)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 7 (1973), S. 133-134 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560070114
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular-orbital calculations on transition metal complexes, charge-transfer spectra and the sequence of metal and ligand orbitals (1972)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 6 (1972), S. 859-880 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An outline is given of a semi-empirical scheme for molecular-orbital calculations on transition-metal complexes according to a revised INDO procedure. To judge the reliability of the results of the calculations, the charge-transfer transitions of a number of complexes have been calculated and compared with experimental data. Both for the excitation energies and for the oscillator strengths the agreement is very satisfactory. With respect to the sequence of occupied metal and ligand orbitals it was found that for closed-shell d6 and d8 systems the molecular orbitals which are mainly composed of metal d orbitals have a lower energy than the orbitals built up from ligand p orbitals. Calculations by the extended Hückel method and other similar schemes give the d orbitals as the highest occupied ones as a result of a bad approximation of the diagonal elements of the Fock matrix. The consequences for the interpretation of photo-electron spectra of transition-metal complexes are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560060506
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular integrals over generalized gaussian basis sets (1974)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 8 (1974), S. 179-191 
    Details
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method is given for obtaining the common molecular integrals over generalized gaussian functions: \documentclass{article}\pagestyle{empty}\begin{document}$$ \chi_i = x^{\lambda_i}_i \exp \big\{ - \big(\alpha_i x^2_i + \alpha^{\prime}_i x^{\prime 2}_i + \alpha^{\prime\prime}_i x^{\prime\prime 2}_i\big)\big\} $$\end{document}The present algorithms are expected to be more efficient than those given in earlier work by the same author.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/qua.560080205
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  • 5
    Electronic Resource
    Electronic Resource
    Notiz über ein einfaches Verfahren zur Darstellung von 3,4-Bismethylencyclobuten (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3461-3462 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061031
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  • 6
    Electronic Resource
    Electronic Resource
    [2.2]Paracyclophane durch Addition von Acetylenderivaten an 1,2,4,5-Hexatetraen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 1891-1902 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation of [2.2]Paracyclophanes by Addition of Acetylene Derivatives to 1,2,4,5-HexatetraeneThe tetrasubstituted [2.2]paracyclophanes 4a - e are formed by cycloaddition of the symmetrical acetylene derivatives 2a - e to 1,2,4,5-hexatetraene (1), and their constitution and configuration is established by spectroscopic methods, degradation and pyrolysis experiments. The tetramethyl ester 4a is reduced to the tetraalcohol 4g, and the tetracarboxylic acid 4c is converted to the bisanhydride 4f and [2.2] paracyclophanes (4h), respectively. All possible disubstituted [2.2] paracyclophanes 6 are obtained when methyl propiolate (5a) is added to. 1, whereas further symmetrical and unsymmetrical acetylene derivatives do not react with 1.
    Notes: Die tetrasubstituierten [2.2]Paracyclophane 4a - e werden durch Cycloaddition der symmetrischen Acetylenderivate 2a - e an 1,2,4,5-Hexatetraen (1) dargestellt und ihre Konstitution und Konfiguration durch spektroskopische Methoden. Abbau- und Pyrolyseversuche bewiesen. Der Tetramethylester 4a wird zum Tetraalkohol 4g reduziert und die Tetracarbonsäure 4c in das Bisanhydrid 4f bzw. [2.2] Paracyclophan (4h) übergeführt. Bei der Anlagerung von Propiolsäure-methylester (5a) an 1 werden alle isomeren disubstituierten [2.2]paracyclophanes 6 erhalten. Weitere symmetrische und unsymmetrische Acetylenderivate reagieren nicht mit 1.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070613
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  • 7
    Electronic Resource
    Electronic Resource
    Kristallisationsvorgänge in ternären Systemen aus Chloriden von einwertigen und zweiwertigen Metallen. I (1917)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 99 (1917), S. 50-66 
    Details
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19170990107
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  • 8
    Electronic Resource
    Electronic Resource
    Comprehensive Two-Dimensional Gas Chromatography with a Rotating Thermal Desorption Modulator and Independently Temperature-Programmable Columns (2000)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 23 (2000), S. 189-196 
    Details
    ISSN: 0935-6304
    Keywords: Comprehensive two-dimensional gas chromatography ; thermal desorption modulator ; temperature programming ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---In comprehensive two-dimensional gas chromatography, two individual separations are coupled by means of a rotating thermal desorption modulator interface. The injection pulse introduced via the interface onto the second column should be as short as possible. Parameters affecting the modulator operation are studied. In the set-up used in this study, the temperature of the second column can be programmed independently from that of the first column. Optimization of the second-dimension separation to minimize peak broadening and maximize resolution is discussed and an elegant approach to determine second-dimension retention times using a non-constant modulation frequency is demonstrated. The high separation power of the comprehensive system is demonstrated by the analysis of technical and biota samples containing chlorinated biphenyls and toxaphene.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Schwefel- und Selendehydrierungen im Mikrogrammbereich (1974)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 271 (1974), S. 257-264 
    Details
    ISSN: 1618-2650
    Keywords: Schwefeldehydrierung, Selendehydrierung ; Ultramikrobereich, Apparatur, TAS-Verfahren. Thermofraktographie/TAS-Verfahren/Chromatographie, Dünnschicht ; Schwefel- und Selendehydrierung, Ultramikrobereich. Analyse von Sesquiterpenderivaten, Abietinsäure. Steroiden ; Chromatographie, Dünnschicht ; Schwefel- und Selendehydrierung, TAS-Verfahren
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird eine Schnellmethode beschrieben, die es erlaubt, unter kontrollierten Bedingungen mit 50–300 μg Ausgangsmaterial eine gekoppelte Dehydratisierung und Schwefel- bzw. Selendehydrierung durchzuführen. Hierbei wird die Probe mit einer Kaliumhydrogensulfat-Schwefel- bzw. Selenmischung für einige Minuten bei vorbestimmten Temperaturen zwischen 160–400° C im TAS-Ofen bzw. Tasomat erhitzt. Die entstehenden Aromaten werden durch einen Stickstoffstrom von 10 ml/min direkt auf den Startpunkt einer DC-Schicht transferiert. Anschließend wird chromatographiert und die auftretenden Reaktionsprodukte werden identifiziert. Zum Studium der Reaktionsvorgänge und der optimalen Temperaturbereiche dient die Thermofraktographie. Es sind Anwendungsbeispiele aus der Sesquiterpen-, Diterpen- und aus der Steroidreihe gegeben.
    Notes: Abstract A rapid method is described which permits to carry out a coupled dehydratization and sulphur resp. selenium dehydrogenation with 50–300 μg of starting material under controlled conditions. The sample is heated on a potassium hydrogen sulphate-sulphur resp. selenium mixture at preselected temperatures of between 160–400° C for several minutes in the TAS-oven resp. the Tasomat. The resulting aromatic components are transferred directly to the starting point of a TLC-plate by a stream of nitrogen at 10 ml/min and the reaction products are identified after chromatography. Thermofractography is applied to study the reaction processes and to determine the optical temperature ranges. Examples of application to the groups of sesquiterpenes, diterpenes and steroids are listed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00432826
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  • 10
    Electronic Resource
    Electronic Resource
    Potential of Flame Ionization Detection Coupled On-Line with Microcolumn Liquid Chromatography Using Aqueous Eluents and an Eluent-Jet Interface (2000)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 23 (2000), S. 309-316 
    Details
    ISSN: 0935-6304
    Keywords: μLC ; FID ; LC-FID ; carbohydrates ; amino acids ; alcohols ; phosphonic acids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: ---The potential of the on-line coupling of microcolumn liquid chromatography (μLC) using aqueous eluents with a flame ionization detector (FID) was evaluated. An eluent-jet interface was modified to allow the efficient introduction of the eluent into the FID. The potential of the method is demonstrated by the μLC-FID determination of lower alcohols and bis(2-hydroxyethylthio)alkanes on porous and non-porous stationary phases, respectively. Flow injection analysis (FIA)-FID experiments with highly polar, thermolabile, semi-volatile and non-volatile compounds like amino acids, organic acids, alkylphosphonic acids, and carbohydrates showed the developed configuration to be a promising approach for the detection of a wide range of analytes. Compared with a nebulization interface, the eluent-jet interface showed 4-10 times higher peaks for citric acid. Detection limits by FIA for all compounds were in the range of 0.2-5 ng injected. With ribose as test compound, plots of peak height vs. amount injected showed good linearity (r2 〉 0.999) in the range of 75-12,000 μg/mL. The repeatability showed relative standard deviations of less than 5%.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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