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A novel ratiometric fluorescent sensor bearing two benzimidazole groups has been synthesized. The sensor showed a ratiometric fluorescence response with an enhancement of the ratios of emission intensities at 443 and 378 nm from 0.17 to 3.21 for Cr 3+ . The ratios of emission intensities at 443 and 380 nm were enhanced from 0.40 to 2.09 for Fe 3+ . Fe 3+ revealed significant...
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