Study on the co-luminescence system of Dy–Gd–1,6-bis(1′- phenyl-3′-methyl-5′-pyrazol-4′-one)hexanedione– cetyltrimethylammonium bromide and its analytical application

Abstract

Dy–1,6-bis(1′-phenyl-3′-methyl-5′-pyr azol-4′-one)hexanedione–cetyltrimethylammonium bromide (Dy–BPMPHD–CTMAB) ion association system has strong fluorescence intensity. In this system, some rare earth ions such as Gd³⁺, Y³⁺ and La³⁺ can exert a fluorescence enhancement effect, leading to a newly found co-luminescence system. From this, a rapid, simple and sensitive method was developed for the determination of trace amounts of Dy³⁺. The results indicate that the fluorescence intensity of the system is linearly related to the concentration of Dy³⁺ in the range 1.0 × 10⁻⁷–1.2 × 10⁻⁵ mol L⁻¹ and the detection limit (S/N = 3) is 3.0 × 10⁻⁸ mol L⁻¹. The luminescence mechanism of the system is discussed.