A fast, highly selective and sensitive colorimetric and fluorescent sensor for Cu2+ and its application in real water and food samples

摘要

A new oligothiophene functionalized Schiff base sensor 3TDC has been successfully designed and synthesized. Sensor 3TDC exhibited "naked-eye" colorimetric and selective "on-off" fluorescence response toward Cu2+ with high selectivity and sensitivity within a wide pH range. The binding ratio of the sensor 3TDC and Cu2+ was determined to be 1: 1 through fluorescence titration, Job's plot, H-1 NMR titration, FTIR and DFT studies. The detection limit is calculated to be as low as 2.81 x 10(-8) M, which is much lower than the allowable level of Cu2+ in drinking water set by U.S. Environmental Protection Agency (similar to 20 mu M) and the World Health Organization (similar to 30 mu M). The binding constant (Ka) of Cu2+ to sensor 3TDCwas found to be 2.52 x 10(4)M(-1). Sensor 3TDC for Cu2+ detection exhibited fast fluorescence response within 30 s and high anti-interference performance. Moreover, sensor 3TDC could be used as an effective fluorescent sensor for detecting Cu2+ ions in various real water and food samples with good accuracy and high precision. (C) 2019 Elsevier B.V. All rights reserved.