1-(5-Benzylthiazol-2-yl)azonaphthalen-2-ol – a new reagent for the determination of Pd(II)

A simple method for the determination of Pd²⁺-ions using the azo dye 1-(5-benzylthiazol-2-yl)azonaphthalen-2-ol (or BnTAN) and toluene or chloroform as extraction media is proposed. The palladium(II) ion interacts with 1-(5-benzylthiazol-2-yl)azonaphthalen-2-ol creating a chelate complex. This compound was extracted into toluene and chloroform from the alkaline and acid aqueous solutions respectively. Obtained extracts showed absorbance maxima at 600 and 684 nm. Obedience to Beer’s law was established in the range of 0.261 to 0.850 μg mL⁻¹ of Pd(II) and the molar absorptivity of the complex of 6.70 · 10³ L mol⁻¹ cm⁻¹ was determined. Optimum reaction conditions for complexation, the effect of variables like time of heating and pH were studied. Detailed studies to check the Pd²⁺ : BnTAN – stoichiometric ratio were carried out. The method was successfully applied for the analysis of Pd(II) in details of electronic devices.