A new chromogenic artificial receptor, a 1,3-bis(indoaniline)-derived calix[4]arene, has been prepared, the ethyl acetate derivative of which shows a selective Ca2+-induced pronounced colour change (wavelength change >100 nm) with an association constant of the order of 106 in 99% EtOH.
Y. Kubo, S. Hamaguchi, A. Niimi, K. Yoshida and S. Tokita, J. Chem. Soc., Chem. Commun., 1993, 305 DOI: 10.1039/C39930000305
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