Structure and Complexation Equilibria of Silver (I) with 2-(4-nitro-benzaldehyde)-benzimidazole-hydrazone

Abstract imple and sensitive spectrophotometric determination method of trace amounts of silver(I) ion using 2-(4-nitro-benzaldehyde)-benzimidazole-hydrazone has been devised. Silver(I) react rapidly with this reagent and forms a red stable chelate, in weak acid medium, which obeys Beer’s law at 496 nm with a molar absorptivity 6.9 ⋅ 103 l mol cm-1 and Sandll’s sensitivity 1.56 ⋅ 10− 3 µg cm-3. The stoichiometry and stability constant of silver chelate has determined using spectrophotometric, potentionmetric and conductometric methods. Interferences from various foreign ions were studied. The nature of the solid chelate has also studied.