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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Pflügers Archiv 274 (1961), S. 44-45 
    ISSN: 1432-2013
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Microchimica acta 52 (1964), S. 690-693 
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary 2-Pyrrolaldehydeethylenediimine is a very sensitive nickel reagent. The detection sensitivity(pD) is 6.7. The color reaction is in accord with the Lambert-Beer law. A method is given for the spectrophotometric determination of nickel. A study was made of the interfering effect of foreign ions. The method is suitable for the determination of small amounts of nickel in steels.
    Abstract: Résumé L'éthylénediimine du pyrrole-2 aldéhyde est un réactif trés sensible du nickel. La sensibilité de la recherche(pD) s'éléve á 6,7. La coloration suit la loi de Lambert-Beer. On communique un procédé de dosage spectrophotométrique du nickel. On a fait l'étude de l'influence gênante des ions étrangers. La méthode convient pour le dosage de faibles quantités de nickel dans les aciers.
    Notes: Zusammenfassung 2-Pyrrolaldehydäthylendiimin ist ein sehr empfindliches Nickelreagens, Die Nachweisempfindlichkeit(pD) beträgt 6,7. Die Farbreaktion entspricht dem Lambert-Beerschen Gesetz. Ein Verfahren zur spektrophotometrischen Nickelbestimmung wurde angegeben. Der störende Einfluß von Fremdionen wurde untersucht. Die Methode eignet sich zur Bestimmung geringer Nickelmengen in Stählen.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 7 (1963), S. 1691-1695 
    ISSN: 0021-8995
    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
    Notes: Comparisons were made of changes in molecular weight and in tensile strength of regenerated cellulose after exposure to 40% KOH at 90°C., for varying lengths of time. In the absence of air, both parameters decreased in a fairly consistent manner. In the presence of air, an initial steeper drop was followed by an irregular up-and-down pattern. The theory is advanced that the increase in tensile strength was caused by increased crystallinity.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 330 (1964), S. 251-258 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: From X-ray powder diagrams the structures of the almost colourless reaction products obtained from CO and Rb or Cs in liquid ammonia have been shown to be rubidium and caesium acetylenediolate, RbOC≡CORb and CsOC≡COCs, respectively. The compounds are isostructural with the previously reported potassium compound and crystallize in the tetragonal system (I 4/mmm), with Z = 2. The unit cell parameters are Using essentially the C—C and C—O bond distances for the linear OCCO2- ion as determined from the potassium compound, the following internuclear distances may be given: It appears that the C—O distance is slightly shorter than that expected for a C—O-single bond, indicating the possibility of conjugation.
    Notes: Die durch Umsetzung von Kohlenmonoxid mit in flüssigem Ammoniak gelöstem Rubidium oder Caesium erhältlichen Präparate erweisen sich nach röntgenographischen Untersuchungen als Rubidium- bzw. Caesiumacetylendiolat, RbOC≡CORb bzw. CsOC≡COCs. Sie sind mit der früher beschriebenen kaliumverbindung isotyp und kristallisieren im tetragonalen System (Raumgruppe I 4/mmm) mit Z = 2 und folgenden Gitterkonstanten: Unter Verwendung der an der Kaliumverbindung abgeleiteten CC- und CO-Abstände des linearen OCCO2--Ions ergeben sich folgende Ionen- bzw. Atomabstände: Der CO-Abstand erscheint etwas kürzer, als der für eine Einfachbindung berechnete, was auf einen Konjugationseffekt schließen läßt.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 332 (1964), S. 197-203 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The crystal structure of NaOCH3 has been determined from X-ray powder diagrams. NaOCH3 is isostructural with LiOCH3 (tetragonal cell with a = 4.34 and c = 7.43 Å). The sodium atoms lie in a plane and are surrounded by the methoxide groups above and below that plane with four oxygen atoms co-ordinated to each sodium atom and vice-versa. By partial hydrolysis (replacement of about each third methoxide group by hydroxide) a much closer packing is achieved in the KOCH3-type structure (a = 3.40 and c = 8.70 Å). Here the sodium and oxygen atoms are equally distributed on two planes (co-ordination number five) with the methyl groups above and below this layer.
    Notes: Die Kristallstruktur von NaOCH3 wurde aus Pulverdiagrammen ermittelt. NaOCH3 ist isostrukturell mit LiOCH3 (tetragonale Zelle mit a = 4,34; c = 7,43 Å). Die Natriumatome liegen in einer Ebene und sind oben und unten von den Methoxylgruppen umgeben, wobei jedes Natriumatom von vier Sauerstoffen umgeben ist und umgekehrt. Durch partielle Hydrolyse (Ersatz jeder dritten Methoxylgruppe durch Hydroxylgruppen) ergibt sich die wesentlich dichtere Packung der KOC3-Struktur (a = 3,40, c = 8,70 Å). Die Natrium- und Sauerstoffatome befinden sich hier in zwei Ebenen (Koordinationszahl 5) mit den Methyl-gruppen über und unter dieser Schicht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 45 (1962), S. 1244-1249 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acolongiflorosid K wurde kristallisiert und seine Konstitution I durch hydrolytische Spaltung ermittelt. Es handelt sich um das α-L-Talomethylopyranosid des Ouabagenins.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 45 (1962), S. 1927-1933 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A general method for the synthesis of π-allyl-iron-tricarbonyl halides, enabling the preparation of the parent π-allyl complexes and also of π-allyl complexes with functional groups attached to the allyl ligand, is described. The method is equally applicable to the preparation of the chlorides, bromides and iodides. A series of such compounds have been prepared, and their physical properties and structures are discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 288-297 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: From theoretical considerations, it can be predicted that electron-withdrawing substituents on an olefin will stabilize the π-bond formed by the latter with zerovalent transition metals in complexes such as π-olefin iron tetracarbonyl. In agreement with this iron tetracarbonyl complexes have been prepared with ligands such as maleic, fumaric, citraconic, acrylic, methacrylic and cinnarnic acids and their derivatives. The structures of these compounds have been confirmed by analytical, IR and NMR data.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 1121-1127 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The structure of the yellow «potassium carbonyl», obtained from CO and K in liquid ammonia, has been shown to be potassium acetylenediolate, KOC≡COK. From X-ray powder-diagrams a tetragonal cell containing two KOC≡COK units with a = 3.93, Å, c = 12.75 Å (space group I 4/mmm) has been derived. The KOC≡COK units are arranged parallel to the c-axis with the following internuclear distnaces: K—0: 2.67 and 2.78 Å; K—K: 3.65 Å; C—0 : 1.28 Å; C—C: 1.21 Å.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 46 (1963), S. 1588-1594 
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The reactions of ethylene and hexatriene with di-iron enneacarbonyl give π-ethylene iron tetracarbonyl, and π-hexatriene iron tricarbonyl, π-hexatriene di-iron octacarbonyl, π-hexatriene di-iron heptacarbonyl, and π-hexatriene iron tetracarbonyl respectively. The compounds with the exception of the latter were isolated and characterised. Their structures are discussed on the basis of Ir.-, NMR.- and dipole moment data.
    Type of Medium: Electronic Resource
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