LAUSR

Abstract A chromone derivative (L) which could be utilized for reversibly detecting Cu2+ and S2− by means of fluorescence quenching and displacement in aqueous solution was designed and developed. Upon the addition of Cu2+, the strong blue-green fluorescence emission of L was quenched rapidly and then recovered in 1 min by successively adding S2−. Furthermore, with the alternate addition of Cu2+ and S2−, the reversible cycles could be repeated for at least four times, which meant that L could be identified as a renewable dual-functioning probe. What's more, due to its excellent sensing performances, this probe L could also be used to detect Cu2+ and S2− with test strips conveniently.