Related Experiment Video
Updated: Jun 28, 2026

The Synthesis, Characterization and Reactivity of a Series of Ruthenium N-triphosPh Complexes
Published on: April 10, 2015
Extraction and spectrophotometric determination of ruthenium and osmium with thiobenzhydrazide
S C Shome1, P K Gangopadhyay, S Gangopadhyay
1Department of Chemistry, Presidency College, Calcutta 700012, India.
Abstract:
Ruthenium forms a pink complex with thiobenzhydrazide in hot 1.0-4.5M hydrochloric acid medium, which can be extracted with chloroform, and the extract shows maximal absorbance at 520 nm. The chloroform-extractable osmium-thiobenzhydrazide complex formed at pH 2.3-4.8 shows maximal absorption at 385 nm as well as at 480-490 nm. The colour of the extracts of both the complexes is stable for more than 24 hr and can be employed for the spectrophotometry of ruthenium and osmium in the presence of a considerable excess of diverse ions commonly associated with them. Ruthenium and osmium can be quantitatively separated from one another with thiobenzhydrazide.
Related Concept Videos
Redox Titration: Overview
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
Redox Titration: Iodimetry and Iodometry
Redox Titration: Other Oxidizing and Reducing Agents
Preparation and Reactions of Thiols
Precipitation Titration: Endpoint Detection Methods
In the Volhard method, a standard excess of AgNO3 is first added to the...

