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

Dy-1,6-bis(1'-phenyl-3'-methyl-5'-pyrazol-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 x 10(-7)-1.2 x 10(-5) mol L(-1) and the detection limit (S/N = 3) is 3.0 x 10(-8) mol L(-1). The luminescence mechanism of the system is discussed.