Pyrophosphate selective recognition in aqueous solution based on fluorescence enhancement of a new aluminium complex

Abstract

A novel and simple fluorescence enhancement method for selective pyrophosphate(PPi) sensing was proposed based on a 1:1 metal complex formation between bis(8-hydroxy quinoline-5-solphonat) chloride aluminum(III) (Al(QS)(2)Cl), (L) and PPi in aqueous solution. The linear response range covers a concentration range of 1.6 × 10(-7) to 1.0 × 10(-5) mol/L of PPi and the detection limit of 2.3 × 10(-8) mol/L. The association constant of L-PPi complex was calculated 2.6 × 10(5) L/mol. L was found to show selectively and sensitively fluorescence enhancement toward PPi over than I(3)(-), NO(3)(-), CN(-), CO(3)(2-), Br(-), Cl(-), F(-), H(2)PO4(-) and SO(4)(2-), which was attributed to higher stability of inorganic complex between pyrophosphate and L.