Pyrene excimer-based fluorescent sensor for detection and removal of Fe3Â + and Pb2Â + from aqueous solutions

A new fluorescent sensor, N, N-bi[4(1-pyrene)-butyroyl]-ornithine (1), for detection and removal of Fe3 + and Pb2 + from aqueous solutions was synthesized. In aqueous solutions containing 40% (v/v) acetonitrile, the special responses exhibit a high selectivity and sensitivity (detection limit up to 5.6 μg/L) with the removable flocculent precipitates to Fe3 + over other common metal ions. However, in aqueous solutions containing 40% (v/v) dimethylsulfoxide, the probe exhibits the analogous fluorescent quenching responses and the removable flocculent precipitates in the presence Fe3 + and Pb2 +.257