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A new rhodamine-based derivative (1) is designed as a colorimetric and fluorescent “off–on” chemosensor for Cr 3+ in aqueous solutions. Its sensing behaviors toward metal ions in neutral aqueous solutions were investigated by UV–vis absorption and fluorescence spectroscopies. Compound 1 is found to exhibit a significant increase in absorbance at 581nm and an amplified fluorescence at 600nm...
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