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  • Crown ethers, quinoid  (1)
  • Solvent polarity  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Aza-crown ethers with quinone side chains: Synthesis, complexation, and protonation (1990)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 123 (1990), S. 1673-1677 
    Details
    ISSN: 0009-2940
    Keywords: Crown ethers, quinoid ; Alkali metal complexes ; Alkaline earth metal complexes ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and spectroscopic investigation of aza-crown ethers with anthraquinone- and 1-aminoanthraquinone-functionalized side chains are described. Cation-induced shifts in the UV/VIS absorption spectra of the ligands dissolved in propylene carbonate are observed only for Li+ among the alkali metal ions and for Mg2+ among the alkaline earth metal ions as well as for Ag+ and Tl+. Only hypsochromic shifts of the absorption spectra of anthraquinone-bearing aza-crown ethers are observed on protonation. The variations of the extinction coefficients are discussed with respect to the sequence of protonation of the different amino groups.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19901230816
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopic studies of the solvent polarities of room-temperature liquid ethylammonium nitrate and its mixtures with polar solvents (1991)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1991 (1991), S. 27-31 
    Details
    ISSN: 0170-2041
    Keywords: Ethylammonium nitrate ; Solvent polarity ; ET(30) scale ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The maximum wavelength of the solvatochromic absorption band of Dimroth-Reichardt's dye I, 2,4,6-triphenylpyridinium N-4-(2,6-diphenylphenoxide) betaine, has been determined at 25°C from the ultraviolet-visible spectra of solutions of this dye in ethylammonium nitrate (EAN) and its mixtures with several polar solvents. The related molar transition energy, ET(30) in kcal/mol, of the long-wavelength absorption band increases sharply, when EAN is dissolved at low concentrations in the various solvents. The pronounced blue shift of the absorption band is attributed to the hydrogen-bond interaction between the ethylammonium cation and the ground state of the betaine molecule.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199119910105
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    Paper (German National Licenses)
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