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A rhodamine spirolactam derivative (1) is developed as a colormetric and fluorescent probe for trivalent aluminum ions (Al3+). It exhibits a highly sensitive “turn-on” fluorescent response toward Al3+ with a 70-fold fluorescence intensity enhancement under 2 equiv. of Al3+ added. The probe can be applied to the quantification of Al3+ with a linear range covering from 5.0 × 10−7 to 2.0 × 10−5 M and...
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