Bulletin of the Chemical Society of Japan
Online ISSN : 1348-0634
Print ISSN : 0009-2673
ISSN-L : 0009-2673
The Micro and Rapid Determination of Cobalt Carbonyl Anion in Organic Solvents by Titration with Methylene Blue
Ryoji Iwanaga
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1962 Volume 35 Issue 2 Pages 247-251


An accurate and rapid method is described for the direct titration of cobalt carbonyl anion in organic solvents. This method is based upon the oxidation reaction of the anion with methylene blue in acid media. The stoichio-metry of the reaction of 2 mol. of the anion with 1 mol. of methylene blue is found only at the pH range from 1.9 to 5.2 or in the acetic acid medium. By using a 1:1 acetic acid-toluene mixture as solvent, and by carrying out the titration at about 0°C, the anion in Lewis bases such as methanol and acetone is titrated successively without any interference by the base reaction. This method is very suitable for the determination of the cobalt carbonyl anion in solutions in the course of various reactions.

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