Spectrophotometric investigation of meto-clopramide and promazine palladium II complexes

The color reaction of metoclopramide or promazine and palladium [II] chloride has been investigated. The optimum reaction conditions, spectral characteristics, conditional stability constants and composition of the water-soluble complexes have been established. The structure of palladium [II] chelates in the solid state is also studied. A spectrophotometric method is proposed for the determination of metoclopramide and promazine hydrochlorides in pure forms and in pharmaceutical preparations. The method is simple, reproducible and accurate and is easily applied to the determination in tables and injection solutions

Spectrophotometric determination of imipramine and promazine through ion-pair formation with molybdenum [V] and thio-cyanate

A new procedure for determining imipramine and promazine by forming ion-pairs with molybdenum [V]-thiocyanate complex is studied. The method consists of extracting the ion-pair formed into dichloromethane from hydrochlorid acid medium which is orange-red in color. The ion- pair has an absorption maximum at 472 nm with molar absorptivities of 1.27 x 104 and 1.64 x 104 M mole-1 cm-1 for imipramine and promazine hydrochlorides, respectively. The ion-pair is stable for over one week at room temperature [25C]. Bent and French's method indicated 1: 4: 2 composition for molybdenum [V]-thiocyanate- imipramine or promazine ion-pair. The method obeys Beer's law in the concentration range 1.0-30.0 mug ml-1 of imipramine hydrochloride and 0.8-24.0 mug ml-1 of promazine hydrochloride. The proposed method can be applied to the determination of imipramine and promazine hydrochlorides in pharmaceutical preparations