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  • 1
    Electronic Resource
    Electronic Resource
    Fixation of Carbon Dioxide by Oxalic Amidinato Magnesium Complexes: Structures and Reactions of Trimetallic Magnesium Carbamato and Related Complexes (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 1055-1064 
    Details
    ISSN: 1434-1948
    Keywords: Carbon dioxide fixation ; Magnesium ; N ligands ; C-C coupling ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reaction of oxalic amidines R1-N=C(NHR2)-C(NHR2)=N-R1 with CH3MgX followed by uptake of CO2 results in the formation of the trimeric carbamato complexes [R1-N=C(NR2-COO)-C(NR2COO)=N-R1]3Mg3(THF)6 (2a: R1 = R2 = Ph; 2b: R1 = R2 = p-tolyl) as the thermodynamically stable final products of the reaction. Their X-ray crystal structures show that the three metal centres are in a linear arrangement. The central magnesium ion is octahedrally surrounded by six O-donor atoms of the μ2-carbamato bridges, while both peripheral magnesium ions are facially coordinated by three O-donor atoms of the carbamato groups and three THF molecules. This coordination sphere can be considered as a structural model for the active centre in the ribulose-1,5-bisphosphate carboxylase/oxygenase enzyme. Compound 2a reacts with ZnCl2 or CoBr2, with CO2 elimination, to form dimeric complexes of the type [X2M(oxalamidinato)MX2][Mg(DMF)6] (M = Zn, Co; X = Cl, Br). X-ray crystal structure analyses show that the d-metals are tetrahedrally coordinated. The magnesium-bromide-containing intermediates in the formation of 2a and 2b are able to transfer CO2 to acetophenone, thus simulating the CO2 activation step in enzymatic biotin-dependent carboxylation reactions.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure and electrical properties of κ-((S,S)-DMBEDT-TTF)2ClO4 (1992)
    Weinheim : Wiley-Blackwell
    Advanced Materials 4 (1992), S. 33-35 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19920040106
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  • 3
    Electronic Resource
    Electronic Resource
    C-Substituierte 1,2,3,5-Dithiadiazoliumsalze und 1,2,3,5-Dithiadiazolyle (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 266-268 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbon Substituted 1,2,3,5-Dithiadiazolium Salts and 1,2,3,5-Dithiadiazolyles
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360315
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  • 4
    Electronic Resource
    Electronic Resource
    Theorie der Ergänzung von Phosphatierungsbädern. (Zur Bildungsgeschwindigkeit sekundärer Deckschichten auf Metallen) (1959)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 10 (1959), S. 761-767 
    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: A theory on the complementing process in phosphating baths(Formation rate of secondary cover layers on metals)Secondary cover layers are deposited on metals from saturated solutions if the equilibrium of the solution is disturbed by corrosion on the metal surface. The rate of corrosion and the rate at which the layer is formed are compared, using the phosphate treatment of iron as an example. With this process, the quotient of the HṠ consumed and the iron dissolved is governed by the stoichiometry of the oxidation reaction concerned. The quotients of the HṠ consumed and the quantity of the zinc phosphate deposit can be calculated if all reactions are diffusion controlled. It is thus assumed that the crystal nuclei are formed rapidly, and that equilibria between zinc and phosphoric acid in the solution remain adjusted upto the metal surface. This theory is confirmed experimentally. It serves to indicate and to determine the composition of complementry solution by means of which the baths can be kept stable.
    Notes: Sekundäre Deckschichten scheiden sich aus gesättigten Lösungen auf Metallen ab, wenn an der Metalloberfläche das Lösungsgleichgewicht durch Korrosion gestört wird. Die Geschwindigkeiten von Korrosion und Abscheidung werden am Beispiel der Phosphatierung von Eisen verglichen. Dabei ist der Quotient aus verbrauchtem H und gelöstem Eisen durch die Stöchiometrie der jeweiligen Oxydationsreaktion bedingt. Der Quotient aus verbrauchten H und Menge des Zinkphosphatniederschlags ist zu berechnen, wenn alle Reaktionen transportbestimmt sind. Es wird also angenommen, daß die Gleichgewichte zwischen Zink und Phosphorsäure in der Lösung bis hin zur Metalloberfläche eingestellt bleiben. Die Theorie wird experimentell bestätigt. Sie dient dazu, um Bäder mit optimalen Eigenschaften anzugeben. Ferner erlaubt sie, die Zusammensetzung von Ergänzungslösungen zu berechnen, mit denen die Bäder stationär gehalten werden können.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19590101205
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  • 5
    Electronic Resource
    Electronic Resource
    Korrosion organischer Kunststoffe durch HautschweißHerrn Prof. Dr. E. Rabald zum 65. Geburtstag gewidmet (1964)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 15 (1964), S. 2-7 
    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: Corrosion of organic plastics, caused by perspiration of the skinPrompted by contact damage caused to technical utensils by perspiration of the skin, corrosion tests have been carried out with different organic plastics in different synthetic perspiration solutions frequently encountered. The tested materials, which belonged to different groups (plastics with synthetic resins through condensation; plastics with synthetic resins through polymerisation; cellulose and cellulose derivatives; casein products), showed considerable differences in their behaviour, not only in different perspiration solutions but also among each other, so that they can be divided into three resistance classes.
    Notes: An technischen Gebrauchsgegenständen durch Hautschweiß aufgetretene Berührungsschäden führten zur Durchführung von Korrosions-Standversuchen mit verschiedenen organischen Kunststoffen in verschiedenen, häufig benutzten synthetischen Schweißlösungen. Die Versuchs-Werkstoffe, die verschiedenen Stoffgruppen (Kunststoffe mit Kunstharzen durch Kondensation, Kunststoffe mit Kunstharzen durch Polymerisation, Cellulose- und Cellulosederivate, Caseinprodukte) angehörten, zeigten einmal in den verschiedenen Schweißlösungen, zum andern untereinander ein stark unterschiedliches, schließlich in drei Beständigkeitsgruppen eingruppiertes Verhalten.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19640150103
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  • 6
    Electronic Resource
    Electronic Resource
    Inihibition der Korrosion von Kupfer und Messing in Ammoniumchlorid-Lösungen durch Kolloide (1963)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 14 (1963), S. 11-14 
    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: Inhibiting the corrosion of copper and bronze in ammonium chloride solutions by colloidsInspired by tests carried out by F. D. Talati, M. N. Desai and A. M. Trivedi, the author has carried out solubility tests with pure copper and with bronzes Ms 60 and Ms 70 in 0.1 n-NH4Cl with and without inhibitor content (the latter consisting of the colloids agar and/or gelatine). In the solution free from inhibitor, copper shows the highest corrosion rate, and Ms 60 has a clearly higher rate than Ms 70. As a result of admixtures of agar or gelatine, the copper corrosion caused by the NH4Cl solution is greatly reduced, whilst on the other hand, admixtures consisting of agar and gelatine greatly activate the corrosion attack. Moreover, whilst both types of bronze are protected against NH4Cl corrosion by agar or gelatine admixtures to roughly the same extent, a different proportion of both agar and gelatine added together will result in an inhibition effect which differs in principle, and which may be either positive or negative.
    Notes: Angeregt durch Versuche von F. D. Talati, M.N. Desai and A. M. Trivedi wurden mit Reinkupfer und den Messingen Ms 60 und Ms 70 Löslichkeitsversuche in inhibitorfreier und in inhibitorhaltiger (Zusätze der Kolloide Agar oder/und Gelatine) O, 1n-NH4Cl durchgeführt. In der inhibitorfreien Lösung wird Kupfer am Stärksten angegriffen. Messing Ms 60 wird deutlich stärker angegriffen als Ms 70. Agar- oder Gelatine-Zusätze setzen den Angriff der NH4Cl-Lösung auf Kupfer stark herab, während Agar- und Gelatine-Zusätze den Angriff stark aktivieren. Während weiter beide Messing-Sorten durch Agar- Oder Gelatine-Zusätze etwa in dem gleichen Ausmaße vor dem Angriff der NH4Cl-Lösung geschützt werden, ergibt der unterschiedlich hohe Zusatz der Inhibitorgemische (Agar und Gelatine) grundsätzlich unterschiedliche Hemmstoff-Wirkungen, und zwar positive oder negative Hemmstoff effekte.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19630140103
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  • 7
    Electronic Resource
    Electronic Resource
    Über die Oxydations- und Korrosionsbeständigkeit von Zirkonium (1955)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 6 (1955), S. 329-331 
    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: On the resistance to oxidation and Corrosion of ZirconiumGaining an increasing application as oxidizing agent, alloy constituent and material for pipes Zirconium is distinguished like titanium by its high resistance to oxidation and corrosion. On basis of the latest American literature this paper presents a survey of its most important physical properties especially of the influence of deformation and annealing in the manufacturing processes of semifinished products as well as of its thermal and chemical resistance to about 45 different corrosive agents.
    Notes: Zirkonium, das als Oxydationsmittel, Legierungselement und Röhrenbaustoff zunehmende Verwendung findet, zeichnet sich, ähnlich wie Titan, durch hohe Oxydations- und Korrosionsbeständigkeit aus. Die Arbeit gibt an Hand des neueren amerikanischen Schrifttums einen zeitgemäßen Überblick über die wichtigsten physikalischen Eigenschaften von Zirkonium, insbesondere über den Einfluß von Verformung und Glühbehandlung im Verlaufe der Halbzeugfertigung sowie über die thermische und chemische Beständigkeit des Zirkoniums gegen etwa 45 verschiedene angreifende Mittel.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19550060703
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  • 8
    Electronic Resource
    Electronic Resource
    Viton® (Lieferarten, Herstellung, Verarbeitung, Eigenschaften, Verwendung). Fortschrittsbericht„Viton“ - eingetragenes Warenzeichen der E. I. Du Pont de Nemours & Co., Inc., Elastomer Chemical Department, Wilmington, Delaware, USA. (1962)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 13 (1962), S. 337-341 
    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: VitonThe synthetic elastomer “Viton” possesses unusual mechanical, thermal and corrosion-chemical properties which justify its application at exposed points, and make it desirable. An introductory survey of the types available and of their structure and manufacture is followed by more detailed particulars concerning the physical, especially the mechanical and thermal, properties and the corrosion-chemical behaviour of differently composed Viton products in contact with numerous corrosives. In conclusion, practical applications are discussed which show that Viton can be used with advantage, especially where combined stresses are encountered.
    Notes: Das synthetische Elastomer „Viton“ besitzt ungewöhnliche mechanische, thermische und korrosionschemische Eigenschaften, die dessen Einsatz an exponierten Stellen rechtfertigen und empfehlen. Einem einleitenden Überblick über verfügbare Sorten und deren Aufbau und Herstellung folgen ausführliche Angaben über die physikalischen, insbesondere mechanischen und thermischen Eigenschaften, sowie über das korrosionschemische Verhalten verschieden aufgebauter Viton-Produkte gegenüber zahlreichen Angriffsmitteln. Abschließend zeigen der Praxis entstammende Einbaubeispiele, daß Viton insbesondere unter kombinierten Beanspruchungen nutzbringend eingesetzt werden kann.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19620130602
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  • 9
    Electronic Resource
    Electronic Resource
    Dedicated (1966)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 17 (1966), S. 1081-1082 
    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
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19660171214
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  • 10
    Electronic Resource
    Electronic Resource
    Über die Anwendung des Natriumsuperoxyds zur Analyse (1893)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 3 (1893), S. 193-194 
    Details
    ISSN: 0863-1778
    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/zaac.18930030123
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