Abstract
A new 5-(furan-2-yl)-7, 8, 13, 14-tetrahydrodibenzo[a,i]phenanthridine (4a) was designed and synthesized for the highly selective determination of Cr3+ over other examined metal ions in semi-aqueous medium. The sensor probe 4a displays significant colorimetric and fluorometric recognition of Cr3+ ion due to the coordination of chromium ion to the electron rich furan oxygen atom and pyridine nitrogen atom of 4a, which induces intramolecular charge transfer character. Compound 4a, on adding Cr3+, exhibited excellent advantages such as high blue emission, fast response time (30 s) and low detection limit (142 nM). The binding mechanism of 4a with Cr3+ was established by FTIR analysis, 1H NMR titration experiment, HRMS and Job’s plot analysis. Inspired by these considerable sensing properties, compound 4a has been successfully applied for detection of Cr3+ in environmental water samples and fluorescence bio-imaging in E-coli bacteria with satisfactory results.
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