Fluorescence Enhanced Water-Soluble Ruthenium Complex: Advancing Precision in Cr(VI) Detection and Quantification.

Abstract

The environment and human health are both at risk from the heavy metal chromium (VI), which is extremely toxic and carcinogenic. Chromium (VI) in various matrices must be accurately and quickly detected for both public safety and regulatory compliance. This paper describes the design and development of a novel fluorescence detector suitable for the sensitive and selective quantification of chromium (VI) ions. Utilizing the special qualities of a properly selected fluorophore with high sensitivity and selectivity toward chromium (VI), the suggested ruthenium metal-based fluorescence detector makes use of these advantages. Ruthenium (II) complex of composition [Ru(bpy)₂(PhDORi)]Cl₂ bpy 2,2'-bipyridine, PhDORi (2S,3R)-4-(1H-imidazo[4,5-f][1,10]phenanthrolin-2-yl)-butane-1,2,3-triol was synthesized. Characterizing the produced chemical has involved analytical and spectroscopic approaches. This complex displayed a broad metal-to-ligand charge transfer band at ~ 457 nm in aqueous solution. Ru(II) complex undergo relatively reversible one-electron oxidation and reduction involving the Ru(II)/Ru(III), according to cyclic voltammetry investigations. In an aqueous solution, the complex exhibits intense fluorescence when the molecule is excited at the MLCT band. The complex exhibit selectivity towards chromate/dichromate anions in the aqueous solution. With ppm to ppb concentration and a linear response across a 10⁵fold concentration range, concentration-dependent emission quenching of the fluorophore by the chromate ions was shown.