A Review on Recent Progress in Organic Fluorimetric and Colorimetric Chemosensors for the Detection of CrIons.

Chromium occurs in the environment primarily in two valence states, trivalent Cr and hexavalent Cr, which have different physicochemical and biochemical properties. However, the higher concentration of Cr can cause various adverse effects on human health. Therefore, detecting Cr ions is important in various samples. Colorimetric and fluorescent chemosensors are the most powerful tools for the detection of Cr ions. These chemosensors have excellent bioimaging capability and significant sensitivity and selectivity. In this article, different colorimetric and fluorescent chemosensors based on organic compounds, including Schiff base, antipyrine, diarylethene, pyrene, crown ether, dansyl, pyridine, thiazole, coumarin, boradiazaindacene, rhodamine, imidazole, hydrazone, and other functional groups for detection of Cr ions have been reviewed, classified them according to different fluorophore and recognition mode. I hope this article will help the readers for the future design of highly effective, sensitive, and selective chemosensors for the detection and determination of Cr ions.