Fluorescence and NMR Binding Studies of N-Aryl-N‘-(9-methylanthryl)diaza-18-crown-6 Derivatives

Abstract
N-Aryl-N‘-(9-methylanthryl)diaza-18-crown-6 derivatives perform as fluorescent photoinduced electron-transfer (PET) sensors with very selective response toward Ca2+ versus Mg2+, Na+, and K+. The fluorescence intensity was increased by a factor of up to 170 in the presence of Ca(ClO4)2. 1H NMR studies show that metal cations affect these molecules very differently: Ca2+ has a global effect on each molecule, while Mg2+ affects part of each molecule, and K+ and Na+ affect each molecule moderately, which is very consistent with the fluorescence response.

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