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  • Best. von Eisen, Cer, Dichromat, Kupfer, Nickel  (1)
  • Hydroxy-functionalized dendrons  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 266 (1973), S. 177-186 
    ISSN: 1618-2650
    Keywords: Best. von Eisen, Cer, Dichromat, Kupfer, Nickel ; Volumetrie ; kernmagnet. Relaxation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Quantitative determination of the concentration of paramagnetic ions in aqueous solutions is performed by NMR relaxation titration. By measurement of the nuclear spin-lattice relaxation time T 1 or the nuclear spin-spin relaxation time T2 redox titrations and complexometric determinations of the concentration of paramagnetic ions are possible. Also the precipitation of ions from the solution can be followed by this method. The use of a magnetic indicator in this analytical method is shown. The sensitivity of the method goes down to concentrations as low as 10−3 M. The accuracy of NMR relaxation titration is better than 1%. A number of applications of the method are given.
    Notes: Zusammenfassung Quantitative Bestimmungen von paramagnetischen Ionen in wäßrigen Lösungen können mit Hilfe der kernmagnetischen Relaxationstitration durchgeführt werden. Durch Messung der Kernspin-Gitter-Relaxationszeit T 1 oder der Kernspin-Kernspin-Relaxationszeit T 2 als Funktion der Ionenkonzentration sind Redoxtitrationen oder komplexometrische Titrationen möglich. Der quantitative Ablauf von Fällungen kann ebenfalls verfolgt werden. Die Verwendung von magnetischen Indicatoren bei der Relaxationstitration wird beschrieben. Bestimmungen von Ionenkonzentrationen bis herab zu 10−3 M Lösungen sind z.Z. möglich. Die Methode erlaubt eine Genauigkeit der Konzentrationsbestimmung von 1% und besser. Die Anwendung der Methode wird an einer Reihe von Beispielen gezeigt.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 2551-2556 
    ISSN: 1434-193X
    Keywords: Dendrimers ; Hydroxy-functionalized dendrons ; Orthogonal protective groups ; Building blocks ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A convenient and practical multi-gram procedure for the synthesis of second- (G2; 4a, 5a, 5d) and third-generation (G3; 6a) dendrons with orthogonally protected functional groups in the periphery (hydroxy) and at the focal point (carboxylic acid) is described. It uses the amply available first-generation dendrons with amine and carboxylic ester functions (1) and tetrahydropyranyl-protected hydroxy and carboxylic acid functions (2b, 3), respectively, which are connected via amides by peptide methods. Purification is either done by recrystallization or simple filtration through silica gel and yields the products as analytically pure materials on a several-gram scale (even for G3). ‘The dendrons’ protective groups are proven to be orthogonal (500-MHz NMR) which makes them useful components (building blocks) of a future dendron construction kit for a versatile synthesis of, for example, dendronized polymers.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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