Abstract
Two new chromogenic calix[4]arene tetraesters bearing nitrophenol residues display a striking cation-selective shift in absorbance maximum from the ultraviolet to the visible region in the presence of base upon addition of lithium ion or, to a lesser extent, sodium ion; the metal salt causes a change from colourless to yellow, the colour density being concentration dependent.
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Schedule a callMore From: Journal of the Chemical Society, Chemical Communications
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