A benzimidazole-based ratiometric fluorescent sensor for Cr³⁺ and Fe³⁺ in aqueous solution
2013
Wang, Meng | Wang, Jungang | Xue, Weijian | Wu, Anxin
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 Cr³⁺. The ratios of emission intensities at 443 and 380 nm were enhanced from 0.40 to 2.09 for Fe³⁺. Fe³⁺ revealed significant adsorption in the UV–vis region, which can be used to discriminate Cr³⁺ and Fe³⁺. Detection limits of the method for Cr³⁺ and Fe³⁺ were 25 μM and 2 μM, respectively. In addition, the sensor showed good selectivity to Cr³⁺ and Fe³⁺ over other metal ions.
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