5-HYDROXYQUINOLINE-8-CARBOXYLIC ACID—A COLORIMETRIC REAGENT FOR RUTHENIUM
- 1 January 1947
- journal article
- Published by Canadian Science Publishing in Canadian Journal of Research
- Vol. 25b (1) , 49-55
- https://doi.org/10.1139/cjr47b-006
Abstract
5-Aminoquinoline-8-carboxylic acid was prepared from 8-methylquinoline by nitration in the 5-position, oxidation of the methyl group to carboxyl, and reduction of the nitro group to amino. The 5-aminoquinoline-8-carboxylic acid was converted to 5-hydroxyquinoline-8-carboxylic acid through the diazonium salt. Some of the properties of the two new compounds were determined.A transmission curve was established for solutions showing the colour developed by the reagent and ruthenium. The standard ruthenium solution used for this purpose contained the metal as it is obtained when distilled as the tetroxide and collected in hydrogen peroxide. Ruthenium in a solution as ammonium chlororuthenate could be determined from the same curve. One γ (1 × 10−6 gm.) of ruthenium in 50 ml. of solution may be quantitatively determined.Keywords
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