Highly Sensitive Fluorescent Probe for Selective Detection of Hg²⁺ in DMF Aqueous Media

A highly sensitive fluorescent probe 1 for selective detection of Hg ion in mixed N,N-dimethylformamide aqueous media was designed and prepared by incorporating the well-known Rhodamine 6G fluorophore and a carbohydrazone binding unit into one molecule. The fluorescent probe 1 can detect the parts per billion level of Hg^II in a mixed aqueous environment and displays a highly selective response of fluorescence enhancement toward Hg^II.