Composition and stability constant of the Pd(II)-quercetin complex were determined by suitable spectrophotometric methods and pH-metric measurements in 507 Ethanol. It was found that the Pd 2 ion and quercetin form a 1:1 complex in which Pd 2 is linked to quercetin through the carbonyl and the 3-hydroxyl group. The stability constant log 1 ranged from 6.05 at pH 5X00 to 4.96 at pH 6X50X The conditions for the spectrophotometric determination of quercetin by means of complex formation were investigated. Beer's law was obeyed up to 5X00 Â 10 À5 M quercetin.

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