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Aza-crown ethers with quinone side chains: Synthesis, complexation, and protonation.

MPS-Authors
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Ossowski,  T.
Research Group Electrochemistry and Reaction Kinetics in Solution, MPI for biophysical chemistry, Max Planck Society;

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Schneider,  H.
Research Group Electrochemistry and Reaction Kinetics in Solution, MPI for biophysical chemistry, Max Planck Society;

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Citation

Ossowski, T., & Schneider, H. (1990). Aza-crown ethers with quinone side chains: Synthesis, complexation, and protonation. Chemische Berichte, 123(8), 1673-1677. doi:10.1002/cber.19901230816.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-0D76-E
Abstract
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.