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  • Chromoionophores  (2)
  • Butenoic acid, arylazo-  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Rubidium-selektive Chromoionophore mit N-(Arylazoalkenoyl)azacoronand-Struktur (1994)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 877-880 
    Details
    ISSN: 0170-2041
    Keywords: Chromoionophores ; Rubidium compounds ; Azacoronands ; Pyrazolin-5(4H)-one, 4,4-dichloro- ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rubidium-Selective Chromoionophores with N-(Arylazoalkenoyl)azacoronand StructureThe N-(arylazoalkenoyl)azacoronands 2a-2c have been synthesized by ring-opening reaction of the dichloropyrazolin-5(4H)-one 1 with the corresponding azacrowns. The structure of 2a was determined by X-ray analysis. In the presence of Rb+ salts the neutral solutions of 2a and 2b in acetonitrile or acetonitrile/water mixtures show a change of colour from yellow to red. Spectroscopic results of 1H-, 2H-, 13C- and 87Rb-NMR investigations indicate a complexation of the Rb ion between the crown and the phenolic OH group of 2b.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199419940905
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  • 2
    Electronic Resource
    Electronic Resource
    Lithium-selektive Chromoionophore vom Arylazobutenoat-Typ (1994)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1994 (1994), S. 265-268 
    Details
    ISSN: 0170-2041
    Keywords: Butenoic acid, arylazo- ; Azoalkenes ; Halochromism ; Chromoionophores ; Lithium complexes ; Crown ethers ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lithium-Selective Chromoionophores of Arylazobutenoate TypeNew lithium-selective chromoionophoric compounds with arylazobutenoic acid structure have been synthesized from dichlorodihydropyrazole 2. The (E,E) isomers of esters of the arylazobutenoic acid (3a, 4, 5) exhibit a remarkable color change in the presence of lithium ions and triethylamine from orange to purple.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199419940307
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    Paper (German National Licenses)
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