Luminescent chemosensors for pH, halide and hydroxide ions based on kinetically stable, macrocyclic europium–phenanthridinium conjugates

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Abstract
The neutral europium complex [EuL 1 ] shows a pH dependent luminescence enhancement of over 500, while in the N-methylated analogue the metal-based luminescence is selectively quenched by chloride and (above pH 10) by hydroxide anions.
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