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Aza‐crown ethers with quinone side chains: Synthesis, complexation, and protonation
Author(s) -
Ossowski Tadeusz,
Schneider Hermann
Publication year - 1990
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19901230816
Subject(s) - chemistry , protonation , hypsochromic shift , anthraquinone , propylene carbonate , crown ether , side chain , quinone , alkali metal , absorption spectroscopy , metal ions in aqueous solution , metal , inorganic chemistry , absorption (acoustics) , photochemistry , polymer chemistry , ion , organic chemistry , electrode , physics , quantum mechanics , electrochemistry , fluorescence , polymer , acoustics
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 Mg 2+ 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.