Electrochemiluminescent behavior of N6-isopentenyl-adenine/ [formula omitted] system on an electrically heated ionic liquid/carbon paste electrode

Abstract

A room temperature ionic liquid (IL), 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF 6) was used as a binder to prepare the electrically heated ionic liquid/carbon paste electrode (IL-HCPE). It has been found that N6-isopentenyl-adenine (2-ip) can enhance the electrochemiluminescent (ECL) intensity of Ru ( bpy ) 3 2 + . The electrode surface temperature ( T e) has great effect on the ECL intensity of Ru ( bpy ) 3 2 + /2-ip system. The ECL intensities has a linear relationship with the concentration of 2-ip in the range of 1.0 × 10 −7–1.2 × 10 −6 mol/L with a detection limit of 3.6 × 10 −8 mol/L ( S/ N = 3) when T e was 58 °C, while the linear range was of 5.0 × 10 −7–1.0 × 10 −6 mol/L with a detection limit of 1.8 × 10 −7 mol/L under 27 °C. It was also found that the reproducibility of this ECL system would be better at elevating temperature, the RSD were 7.2% and 1.5% for 8.0 × 10 −7 mol/L of 2-ip at 27 and 58 °C, respectively. The possible mechanism of the Ru ( bpy ) 3 2 + /2-ip ECL system has been proposed also.