A Rhodamine-based Fluorescent Chemodosimeter for Au in Aqueous Solution and Living Cells.

A highly selective rhodamine hydrazide-based fluorescent chemosensor for Au detection was developed. The aqueous solution of rhodamine N-hydroxysemicarbazide (RHS), in the presence of Au, exhibited a significant 55-fold turn-on fluorescence response at 591 nm and a colorimetric change from colorless to pink. Other interested ions including Li, Na, K, Cs, Mg, Ca, Ba, Pb, Mn, Co, Ni, Ag, Cd, Cu, Hg, Zn, Sn, Fe, Fe, Cr, Ce did not induce any distinct color/spectral changes.