Mepazine Hydrochloride as a New Reagent for the Spectrophotometric Determination of Ruthenium(lll)

Department of Post-graduate Studies and Research in Chemistry, University 

of Mysore, Manasa Gangotri, Mysore 570006, India.

Manuscript received 12 July 1976, accepted 10 February 1977.

Mepazine hydrochloride forms a red coloured complex with ruthenium(III) at room temperature in acid medium. The red complex exhibits absorption maxi­mum at 512-516 am. Beer's law is valid over the concentration ranges 0.40-12.8 ppm in sulphuric acid and 0.32-6.4 ppm in hydrochloric acid. The Sandell's sensi­tivity of the reaction is 0,022 \(\mu\)g/cm². in H₂SO₄ and 0.015 µg cm² in HCI. The respective molar absorptivity is 4.48 x 10³ 1 mol^-1cm^-1 in H₂SO₄ and 6.7 x 10³ 1 mol^-1 cm^-1 in HCI. The composition study by molar ratio method indicates that the ruthenium-MH complex has a ratio of 1 : 2.