Determination of carbon monoxide in metal carbonyl complexes

Our plain-English summary of Determination of carbon monoxide in metal carbonyl complexes, by A.D. Campbell, P.E. Nelson (Talanta, 1969).

The study

• Authors: A.D. Campbell, P.E. Nelson
• Journal: Talanta
• Published: 1969;16(7):875-9
• Cited by: 1 article, as counted by NIH iCite
• Read it: PubMed · Publisher

Abstract

Carbon monoxide is liberated from carbonyl-containing metal complexes by treatment with various reagents such as pyridinium hydrobromide perbromide in dichloromethane, hydrogen peroxide in acetone, or iodine in pyridine, and oxidized to carbon dioxide by the Schütze iodine pentoxide reagent. The carbon dioxide is determined gravimetrically following absorption on soda asbestos.

In plain English

This is a laboratory chemistry paper from the University of Otago, Dunedin, New Zealand. It is not a study of asbestos exposure or disease. The authors described a method for measuring carbon monoxide in metal carbonyl complexes. In the method, carbon monoxide was released from the sample by a reagent and converted to carbon dioxide. The carbon dioxide was then weighed after it was absorbed on "soda asbestos", a laboratory absorbent used here only as a reagent. Procedures were given for three main reagent systems; bromine in pyridine was also tried and proved unsatisfactory. Pyridinium hydrobromide perbromide in dichloromethane proved the most reliable, although heavy metal complexes such as osmium complexes did not decompose with it. Hydrogen peroxide in acetone worked for several complexes but was unsatisfactory for the cyclopentadienyl iron dicarbonyl dimer. Iodine in pyridine was unsatisfactory as a general method. The authors stated that the compounds tested were assumed to be pure, and that there was often not enough sample to test both successful methods. The authors concluded that the method had been applied successfully to measuring carbon monoxide in these complexes.

We wrote this plain-English summary from the full article with the help of AI, and a second AI model checked each sentence against the article. It is not the authors' wording; the abstract and the article are their own account.

What the study did and found

• Design: Laboratory analytical-chemistry methods study (development and testing of a measurement procedure); not a health study
• Who was studied: Metal carbonyl complexes (chemical compounds, not people) supplied by research projects, analysed at the University of Otago, Dunedin, New Zealand; results listed in Table I
• Exposure: No asbestos exposure was studied. "Soda asbestos" (microanalytical reagent grade) was used only as a laboratory absorbent for carbon dioxide; no fiber type is named.
• Main results:
  • Of the reagents tested for releasing carbon monoxide, pyridinium hydrobromide perbromide in dichloromethane proved the most reliable
  • A mixture of bromine in pyridine was also tested and proved unsatisfactory
  • Heavy metal complexes, such as osmium complexes, failed to decompose with pyridinium hydrobromide perbromide
  • Hydrogen peroxide in acetone was unsatisfactory for the cyclopentadienyl iron dicarbonyl dimer, and many complexes did not dissolve in acetone
  • Iodine in pyridine was unsatisfactory as a general method
  • A cobalt carbonyl cluster gave 16.7% carbon monoxide with hydrogen peroxide in acetone and 52.0% with pyridinium hydrobromide perbromide (OCR prints "52-O")
• The authors' conclusion: The authors concluded that their method had been successfully applied to measuring carbon monoxide in carbonyl-containing metal complexes
• Limitations the authors state:
  • The compounds were assumed to be pure
  • Often there was not enough sample to test both successful methods
  • The cobalt cluster result was not quantitative, assuming the compound was pure

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