Crown ether-containing Schiff base as a highly efficient 'turn-on' fluorescent sensor for determination and separation of Zn~(2+) in water

摘要

A highly efficient Zn2+ "turn-on" fluorescent sensor, [4′-benzo-15-crown-5]NCH-(2-OH-C_6H_4) (HL), has been synthesized. In the presence of Zn(NO_3)_2, HL displays high selectivity and sensitive enhancement of fluorescence intensity in water with the formation of [ZnL_2]. Addition of an equimolar amount of KNO_3 to [ZnL_2] leads to the formation of {[KZnL_2]NO_3}_n.