A new type of chromoionophore, mono(indoaniline)-derived calix[6]arene 1, has been synthesized, which shows a selective UO22+ ion-induced pronounced colour change (wavelength change ca. 60 nm) with increasing absorption intensity in 99% EtOH at 25 °C, making it of potential use as an optical sensor for UO22+ detection.
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Kubo et al. (1994) studied this question.
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