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  • Analytical Chemistry and Spectroscopy  (1,544)
  • Inorganic Chemistry  (1,485)
  • Chemical Engineering  (824)
  • Humans  (500)
  • 2015-2019
  • 1975-1979  (4,353)
  • 1979  (2,236)
  • 1978  (2,117)
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  • 2015-2019
  • 1975-1979  (4,353)
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  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 25 (1979), S. 763-773 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A theoretical and experimental analysis of self-inducting turbo aerator performance was carried out based on the theory of water jet injector operation. It was shown that the aerator's injection coefficient is completely determined by only two dimensionless groups, CH and EuG, between which there is a single valued dependence on whose basis generalization of experimental data is possible. An analytical expression for the optimality criterion or aerator performance index, accounting for aerator gas capacity, power consumption, and submergence, has been obtained in terms of CH and EuG with only one adjustable parameter. From the above two dependencies, a methodology was developed for determining optimal operating conditions, by means of which all the data necessary for the optimal design can be obtained from the results of bench scale experiment.
    Additional Material: 12 Ill.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 429-435 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Surface roughening by diatomaceous support (5 micron particles deposition) ; Organic glue (polar polymethacrylate acetate) used as intermediate material ; Reproducibility and durability of capillaries discussed ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A technique for adhesion of fine particles (ca. 5 μ) of the 405 white diatomaceous support on the inner wall of glass tube with organic glue [poly (diethylaminoethyl methacrylate) acetate] is described. The coated tube was drawn to capillary column by using a machine designed according to Desty's. The capillary column was then coated with stationary phase (such as squaiane, QF-1, Dexsil 300, PEG 20 M, OV-1, SE 30 and etc.) by the conventional dynamic or static method. This preparation method has proved easy to duplicate and is simple. The coating efficiency (UTE %) is within 60-90. The theoretical plate number per meter of an SE 30 column is about 4000, and per meter of a PEG 20 M column is about 2500. The columns thus prepared have been successfully used to analyze petroleum hydrocarbons, essential oils, petrochemicals, pheromone, steroid metabolites and others.
    Additional Material: 6 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 443 (1978), S. 11-18 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: TlPd3O4 and TlPt3O4 - Ternary Platinum Metal Oxides with Cluster StructureThe crystal structure of the cardinal red oxide TlPd3O4, prepared by the reaction of Pdo with TlNO3 or Tl2O3 at 550°C, has been determined on powder samples by X-ray and neutron diffraction. The structure of the cubic compound (a = 959.6(2) pm; space group Fm3m; Z = 8) contains square-planar PdO4 units which are joined to a three dimensional skeleton by triply bonding oxygen atoms. The cubic and rhombicuboctahedral spaces are occupied by TlIII and TlI cations so that the compound can be formulated as a mixed valency thallium(III)-thallium(I)-oxopalladate(II). The relationship with the structure of the platinum bronzes is discussed.The analogous ternary platinum oxide TlPt3O4 (a = 966.3(2)pm) has been obtained by thermal decomposition of Tl2Pt2O7.
    Notes: Die Kristallstruktur des durch Umsetzung von Pdo mit TlNO3 bzw. Tl2O3 bei 550°C erhaltenen kardinalroten Oxides TlPd3O4 wurde durch Röntgen-und Neutronenbeugung an Pulverproben aufgeklärt. In der Struktur der kubischen Verbindung (a = 959,6(2) pm; Raumgruppe Fm3m; Z = 8) sind quadratisch planare Pdo4- Baugruppen über dreibindige O- Atome zu einem dreidimensionalen Netz verknüpft. Die würfelförmigen und rhombendodekaedrischen Hohlräume des Gerüstes sind von TlIII-bzw. TlI-Kationen besetzt, so daß die Verbindung als valenzgemischtes Thallium (III)-thallium(I)-oxopalladat(II) formuliert werden kann. Die Verwandtschaftsverhältnisse zu den Strukturen der Platinbronzen werden diskutiert.Das entsprechende Oxoplatinat TlPt3O4 (a = 966,3(2) pm) konnte durch thermische Zersetzung von Tl2Pt2O7 erhalten werden.
    Additional Material: 3 Ill.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 423-428 
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, nickel ; „Transevaporator“ into packed pre-column as sampling technique prior capillary described ; Application to volatile metabolite body fluid analysis for early detection of disease ; Serum and human breast milk as examples ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Nickel capillary columns coated with moderately polarstationary phases such as Witconol can be used for the separation of the organic volatile fraction from biological fluids. A “transevaporator” sampling technique for the collection of the organic volatiles on glass beads from as little as 5 to 500 μl of biological fluids (e.g. urine, serum, amniotic fluid, breast milk, saliva, etc.) is described. The organic volatiles are thermally desorbed from the glass beads into a short precolumn cooled in liquid nitrogen, which overcomes the problems associated with sample introduction onto narrow-bore capillary columns. The application of the full analytical technique to problems associated with the early detection of disease is illustrated.
    Additional Material: 5 Ill.
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  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Spectra of Solid, Liquid, and Soluted Metal Polysulphides. II Polysulphides Rb2Sn (n ≥ 4) and Na2S4All compounds have been prepared from the elements in liquid ammonia. Whereas Rb2S4 has no defined composition, the vibrational spectra of Cs2S4 and their structure similar to Na2S4 indicate that Cs2S4 is a well-defined compound in contrast to former suggestions. Rb2S5 and Cs2S6 are the members with the greatest chainlength of their homologe series.While Na2S4 still exists of S42- chains in the melt the other polysulhpides disproportionate to S3- radicals and probably monosulphide. In the melt of Cs2S6, quenched to room temperature, a double branched chain structure, the thio-analogue of dithionite, S2S42-, is suggested. All polysulphides have a mean valence frequency, which is independent of the cation and decreases with increasing chainlength.
    Notes: Alle Verbindungen wurden aus den Elementen im flüssigen Ammoniak dargestellt. Während Rb2S4 keine definierte Zusammensetzung aufweist, zeigen die Schwingungsspektren des Cs2S4 sowie deren ähnliche Struktur mit dem Na2S4, daß Cs2S4 entgegen früheren Annahmen als eigenständige Verbindung auftritt. Rb2S5 und Cs2S6 sind die langkettigsten Glieder ihrer homologen Reihe. Während Na2S4 auch in der Schmelze noch aus S42--Ketten besteht, findet für die anderen Polysulfide eine Disproportionierung in S3--Radikale und wahrscheinlich Monosulfid statt. In der auf Zimmertemperatur abgeschreckten Schmelze des Cs2S6 wird eine zweifach verzweigte Kettenstruktur, ein Thioanaloges des Dithionits, S2S42-, angenommen. Bei allen Polysulfiden gibt es eine mittlere Valenzfrequenz, die unabhängig vom Kation mit steigender Kettenlänge absinkt.
    Additional Material: 12 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 65-73 
    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 nine diastereoisomeric pairs of 4-methyl-2-X-2-Y-1,3,2-dioxaphosphorinanes have been examined. The differences between the intensities of particular ions in the mass spectra of geometrical isomers are reported and rationalized in terms of the conformations adopted by compounds.
    Additional Material: 1 Ill.
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  • 7
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Raman scattering of two vibrational overtones of benzene is found to undergo strong preresonance enhancement as the excitation frequency approaches the 1B2u state, the lowest lying, forbidden electronic transition at 265 nm. These preresonance active modes are the first overtone of the 606 cm-1 e2g fundamental, which is responsible for the vibronically induced 1B2u intensity, and the first overtone of the 848 cm-1 e1g fundamental, an out-of-plane C—H bending mode. In order to treat this overtone preresonance Raman behavior theoretically, the molecular polarizability is consistently expanded to second order in nuclear displacements, and thus we consider all preresonance contributions of this order. The leading contributions of strictly dipole-forbidden electronic transitions to the scattering cross-section of overtones are exposed. Within this theoretical context it is seen how scattering cross-section for each of these resonance active overtones is derived from different sources. The preresonance scattering of the 606 cm-1 overtone results from the vibronic activity of this fundamental in the 1B2u transition. On the other hand, the 848 cm-1 overtone derives its 1B2u resonance activity from the change in its fundamental frequency (to 585 cm-1) in this excited electronic state. Furthermore, the 848 cm-1 overtone activity is built upon signifficant background preresonance contributions from other higher lying electronic transitions.
    Additional Material: 4 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 454 (1979), S. 134-144 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cobalt(II) Hydrogenarsenate Monohydrate. Preparation and Crystal StructureCo[H2O|HOAsO3] was prepared by heating of As2O5, CoSO4 · 7 H2O and H2O at 150°C in a sealed tube and investigated by X-rays. The compound crystallizes triclinic, space group P¯1 with a = 786.5, b = 1569.9, c = 671.9 pm, α = 94.25, β = 96.89, γ = 90.28° and Z = 8.The structure contains chains of edge-shared CoO6 octahedra connected by AsO4 tetrahedra forming sheets. Two of such somewhat different sheets built up the whole structure. Based on the charge balance derived from the geometrical data and the IR spectra the occurrence of hydrogen bridges is discussed.
    Notes: Co[H2O|HOAsO3] wurde durch Erhitzen von As2O5, CoSO4 · 7 H2O und H2O auf 150°C im Autoklaven dargestellt und röntgenographisch untersucht. Die Verbindung kristallisiert triklin, Raumgruppe P¯1 mit a = 786,5, b = 1569,9, c = 671,9 pm, α = 94,25, β = 96,89, γ = 90,28° und Z = 8. Die Struktur enthält Ketten aus kantenverknüpften CoO6-Oktaedern, welche über AsO4-Tetraeder zu Schichten verknüpft sind. Zwei solche etwas verschiedenartige Schichten bilden die Gesamtstruktur. Anhand der aus den geometrischen Daten berechneten Ladungsbilanz und der IR-Spektren wird das Auftreten von Wasserstoffbrücken diskutiert.
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 43-50 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Gas chromatography mass spectrometry was used to examine a large number of 2,4,6-trialkoxy-s-triazines. The fragmentation of these compounds upon electron impact is discussed. This method permits reliable and rapid identification of mixtures of triazines obtained by reaction of 2,4,6-trichloro-s-triazine with mixtures of alcohols.
    Notes: Zahlreiche 2.4.6-Trialkoxy-s-triazine wurden mittels Gaschromatographie-Massenspektrometrie untersucht. Die Fragmentierung dieser Verbindungen bei Elektronenbeschuß wird diskutiert. Die Methode erlaubt, komplexe Triazingemische, die bei der Umsetzung von 2.4.6-Trichlor-s-triazin mit Alkoholgemischen entstehen, schnell und sicher zu identifizieren.
    Additional Material: 5 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1978), S. 248-253 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The fragmentation of the homologous fatty acid tetraesters of pentaerythritol (C-2 to C-14) upon electron impact was investigated. The main fragment ions are [M—RCOO]+ and [M—RCOOH]+, for which cyclic acetal structures are postulated. Subsequent fragmentation was elucidated by ‘direct analysis of daughter ion’ (DADI) measurements and high resolution measurements. Esters of branched fatty acids can be distinguished from esters of n-fatty acids by characteristic ions. Isomeric esters of n-fatty acids cannot be separated by gas chromatography but identification is also possible by mass spectrometry.
    Notes: Die Fragmentierung der homologen Fettsäuretetraester des Pentaerythrits (C-2 bis C-14) bei Elektronenbeschuß wurde untersucht. Hauptspaltfragmente entstehen durch [M—RCOO]+ und [M—RCOOH]+. Diese Ionen liegen vermutlich als cyclische Acetale vor. Der weitere Zerfall dieser lonen wird anhand von DADI-Messungen und Massenfeinbestimmungen geklärt. Ester verzweigter Fettsäuren können anhand charakteristischer Ionen von solchen aus n-Fettsäuren unterschieden werden. Die massenspektrometrische Identifizierung von isomeren n- Fettsäureestern, die gaschromatographisch nicht aufgetrennt werden können, ist ebenfalls möglich.
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