Abstract
A new fluorogenic calix[4]tetraaza-crown-6 ( 4) bearing two pyrene amide groups has been prepared. It was shown to be selective for Mg 2+. When Mg 2+ is bound to 4, the pyrene monomer emission increased while the excimer emission declined in a ratiometric manner. It is shown by 1H NMR that this ratiometric change is due to the conformational changes of the pyrenes during the chelation of Mg 2+ by the amide functions to form a 1:1 complex.
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