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  • Chemistry  (6)
  • transition metal acetates
  • 1970-1974  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Über die spektrale Sensibilisierung von Zinkoxid: I. Sorptionsverhalten von o,o′-DihydroxyazofarbstoffenVorgetragen am 4. Internationalen Farbensymposium, Lindau (BRD), 11.-15. Mai 1970. (1970)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 53 (1970), S. 1133-1145 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: o,o′-Dihydroxyazo compounds are spectral sensitizers for the photosemiconductor properties of zinc oxide. It is shown that 1-(2-hydroxyphenylazo-)-2-naphthol (II) forms a 1:1 Zn complex on the surface of ZnO particles if adsorbed from toluene solution. With most samples of ZnO a Langmuir type adsorption isotherm is obtained. The concentration of the dye at saturation relative to the BET surface of the ZnO particles correponds to a slightly oblique edge-on arrangement of the dye molecules on the surfaces.In the case of ZnO pretreated with propionic acid and having taken up dye in excess of a monolayer, it can be shown by electron microscopy that tail-like complexes (zinc: dye ratio = 1:1) are formed, and that these complexes contain zinc which was originally on the particle surfaces.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19700530529
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  • 2
    Electronic Resource
    Electronic Resource
    Infrarotspektroskopische und thermoanalytische Untersuchung von Trikobalt(II)-dihydroxidsulfat-dihydrat, Co3(OH)2(SO4)2 · 2H2O (1971)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 1628-1637 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The infrared spectra between 600 and 4000 cm-1 of Co3(OH)2(SO4)2 · 2H2O, Co3(OH)2(SO4)2, and Co3(OD)2(SO4)2 · 2D2O are reported and discussed. The spectra are mainly examined in relation to the binding state of the water molecules. The results are in good agreement with the previously described crystal structure studies. Thermogravimetry, differential thermal analysis and X-ray diffraction methods were used to investigate the unusual thermal decomposition behaviour of Co3(OH)2(SO4)2 · 2H2O. The kinetics of the dehydration reaction are discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19710540614
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  • 3
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von Trikobalt(II)-dihydroxidsulfat-dihydrat, Co3(OH)2(SO4)2 · 2 H2O (1971)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 1621-1628 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tricobalt (II)-dihydroxidesulfate-dihydrate, Co3(OH)2(SO4)2 · 2H2O, is orthorhombic: a = 7.21, b = 9.77, c = 12.86 Å, V = 905.9 Å3, space group D112h-Pbcm with four formula units per cell. The atomic positions have been determined by threedimensional Patterson and Fourier synthesis and full-matrix least-squares refinement of single crystal X-ray diffraction data.The structure shows infinite chains [001] of Co—O octahedra sharing one edge with each other. These chains are linked together by alternating SO4 tetrahedra and additional Co—O octahedra, thus giving rise to a three-dimensional network of polyhedra. There is no similarity to the well known layer structures of most hydroxide salts of divalent metals. The SO4 tetrahedra are regular while the Co—O octahedra show considerable distortion. The water molecule is coordinated to one Co atom and bonded to sulfate oxygen by two weak hydrogen bridges.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19710540613
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  • 4
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Physisorption und Chemisorption von Wasser auf Zinkoxid-Oberflächen (1972)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 55 (1972), S. 1249-1266 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The investigation of different zinc oxide samples by means of thermogravimetry and infrared spectroscopy has shown that the surface of the samples is covered by an approximately monoatomic layer of hydroxide groups. Furthermore, varying amounts of carbonate groups are found which are due to the presence of zinc hydroxide carbonate II [Zn5(OH)6(CO3)2]. Below relative water vapour pressures of p/p0 = 0.2 (25°C), two hydrogen bridges connect one physisorbed water molecule with two chemisorbed surface hydroxide groups. In addition, about the same amount of water is physically adsorbed between vapour pressures of p/p0 0.2 and 0.8. At still higher relative humidity, a multimolecular layer is built up which reaches a thickness of about 200 water molecules at p/p0 = 1.0.All samples show in the v-OH region of the IR. spectrum a broad absorption with four bands, A, B, C, and D. The position of the bands and the change of their intensities when rising the temperature of the samples up to 600°C indicate that both bands of longer wave lengths, C and D, arise from physically adsorbed water molecules, while the bands A and B are due to hydroxide groups located on the crystallographic faces (0001) and (0001), respectively.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19720550421
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  • 5
    Electronic Resource
    Electronic Resource
    Zum Einfluß der Gefügeausbildung auf das Korrosionsverhalten von Aluminiumbronzen in KochsalzlösungTeilauszug aus der Dissertation von P. Süry: “Unter-suchungen zum Gefügeaufbau und Korrosionsverhalten von Aluminiumbronzen”, Universität Zürich 1970. (1971)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 22 (1971), S. 135-143 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Influence of the structure on the corrosion behaviour of aluminium bronzes in sodium chloride solutionThe influecne of various structural components and their distribution on the corrosion behaviour of binary and complex aluminium bronzes (cast INOXYDA alloys) in a 3% solution of sodium chloride has been investigated qualitatively and quantitatively. Corrosion tests were carried out over a period of 850 h and are interpreted on the basis of single phase properties.The corrosion resistacne of binary and INOXYDA 3 type alloys is markedly decreased if even small amounts of y2 phase are precipitated in a continuous manner. The occurance of this constituent causes an intense and dangereous dealuminisation reaction. The eutectoid mixture (α + y2) is always less corrosion resistant than corresponding martensitic structures.While the corrosion behaviour of these alloys is strongly influenced by heat treatment a far less pronounced effect is observed with alloys containing Fe and Ni (type INOXYDA 53 or 90). This is directly related to the fact that precipitation of y2 is prevented by the addition of Fe and especially of Ni. Such alloys are mainly composed of Ni. Such alloys are mainly composed of α and passive Fe- and Ni-rich K phase. If retained martensite or y2 are present in addition to the mentioned phases (e.g. in the as cast condition) corrosion resistance is decreased. Appropriate heat treatment results in plain (α + K) structures while simultaneously segregations at α/K grain boundaries disappear and corrosion resistance is improved.
    Notes: Der Einfluß verschiedener Gefügeausbildungen auf die Korrosionseigenschaften binärer und komplexer Aluminiumbronzen (INOXYDA-Gußlegierungen) in ruhender 3%iger Kochsalzlösung wurde ermittelt. Die qualitativen und quantitativen Resultate aus Standversuchen über 850 h wurden anhand des korrosions chemischen Verhaltens der einzelnen Gefügebestandteile diskutiert.Bei binären Legierungen und INOXYDA 3 führen schon geringe Mengen zusammenhängend ausgeschiedener y2-Phase zu einer deutlichen Abnahme der Korrosionsbeständigkeit, wobei intensive Entaluminierung auftritt. Die Gleichgewichtsgefüge mit den Phasen α und y2 sind in jedem Fall weniger beständig als die Abschreckgefüge mit martensitischen Anteilen.Im Gegensatz zu diesen Legierungen konnte bei Fe- und Ni-haltigen Bronzen vom Typ INOXYDA 53 oder 90 nur ein viel geringerer Einfluß der Wärmebehandlung auf das Korrosionsverhalten beobachtet werden. Dies steht eindeutig mit der Unterdrückung von y2 durch Fe- und besonders Ni-Zusätze in Zusammenhang. Solche Legierungen bestechen praktisch nur aus α und der passiven, Fe- und Ni-reichen K-Phase. Enthalten die Mehrstoffbronzen jedoch zusätzlich Restmartensit oder y2, wie das im Gußzustand normalerweise der Fall ist, so ist die Korrosionsbeständigkeit herabgesetzt. Durch geeignete Wärmebehandlung kann auch hier ein reines (α + K)-Gefüge erreicht werden wobei gleichzeitig Seigerungen innerhalb α und K abgebaut und der Korrosionswiderstand erhöht wird.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19710220205
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  • 6
    Electronic Resource
    Electronic Resource
    Röntgenographische und spektroskopische Untersuchungen an zwei Modifikationen von Dichloro-2,2′-dipyridyl-platin(II) (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 407 (1974), S. 244-256 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: X-ray and Spectroscopic Studies on the two Modifications of Dichloro-2,2′-bipyridyl Platinum(II)Two modifications of PtCl2(2,2′-bipyridyl) are investigated by X-ray diffraction and spectroscopic methods. The difference between both forms consists only in the packing of the planar complex units within the crystal. For the red coloured modification a columnar structure is derived from X-ray single crystal data, in which the nearest distance between planar complex units stacked above each other is 3.40 Å. The yellow form, however, does not form a columnar structure. It is built up from essentially isolated complex molecules without any feasible Pt-Pt-interaction (shortest Pt-Pt-distance: ca. 4.5 Å). Infrared and electronic spectra confirm the proposed structures. In the visible range only electronic transitions of the type 5d(Pt) → π*(bipyridyl) are observed which are also responsible for the different colours of the two modifications.
    Notes: Röntgenographische und spektroskopische Untersuchungen an zwei Modifikationen von PtCl2(2,2′-dipyridyl) zeigen, daß der Unterschied zwischen den beiden Formen lediglich in einer verschiedenen Packung der planaren Komplexeinheiten im Kristall besteht. Aus Einkristall-Röntgendaten wird für die rote Modifikation eine Kolumnarstruktur postuliert, in der die Komplexebenen im Abstand von 3,40 Å übereinander geschichtet sind. Die gelbe Form besitzt dagegen keine Kolumnarstruktur. Sie muß aus weitgehend isolierten Komplexbausteinen ohne merkliche Pt-Pt-Wechselwirkung (kürzester Pt-Pt-Abstand:etwa 4,5 Å) aufgebaut sein. Infrarot- und Elektronenspektren beider Formen bestätigen die Strukturvorschläge. Im sichtbaren Bereich lassen sich nur inverse Elektronentransfer-übergänge vom Typ 5d(Pt)→ π*(Dipyridyl) beobachten, die auch für die unterschiedliche Farbe der beiden Substanzen verantwortlich sind.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744070215
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