Abstract
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.
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