Colorimetric and fluorescent chemosensor for highly selective and sensitive relay detection of Cu and HPO in aqueous media.

In this manuscript, a new colorimetric and fluorescent chemosensor (T) was designed and synthesized, it could successively detect Cu and HPO in DMSO/HO (v/v=9:1, pH=7.2) buffer solution with high selectivity and sensitivity. When added Cu ions into the solution of T, it showed a color changes from yellow to colorless, meanwhile, the green fluorescence of sensor T quenched. This recognition behavior was not affected in the presence of other cations, including Hg, Ag, Ca, Co, Ni, Cd, Pb, Zn, Cr, and Mg ions. More interestingly, the Cu ions contain sensor T solution could recover the color and fluorescence upon the addition of HPO anions in the same medium. And other surveyed anions (including F, Cl, Br, I, AcO, HSO, ClO, CN and SCN) had nearly no influence on the recognition behavior. The detection limits of T to Cu and T-Cu to HPO were evaluated to be 1.609×10M and 0.994×10M, respectively. In addition, the sensor T also could be served as a recyclable component and the logic gate output was also defined in sensing materials. The test strips based on sensor T were fabricated, which acted as a convenient and efficient Cu and HPO test kits.