Cobalt, or more specifically, goblin is the name of a ferromagnetic metal with a chemical name meaning “goblin”, which was borrowed from a German word for the same. It is an important element in the production of superalloys and magnetic alloys. In addition, it is a radioactive tracer and useful as a gamma ray source. For example, it is used as a precursor in a nuclear reactor in which the resulting cobalt 60 is a commercially important radioisotope.
A trioxalatocobaltate (III) compound, a oxalate complex that is trisbident, or trisbidentally trisbident, in aqueous solution. The tidbit is that the aforementioned compound can be oxidized to the trisbidentate form in a dilute hydrochloric acid solution. As a bonus, the trisbidentate form shows a higher activation energy. Another tidbit is that it can be reacted with lead peroxide to yield an emerald-green coloured solution. Among other things, it is an appropriate model for a thermochemically reduced mercuric chloride.
The best aqueous solutions have pH ranging from 4.5 to 7.0. The aforementioned trisbidentate compound was standardized against a pure potassium dicliromate, and the color was an emerald green in aqueous solution. Various lines of research have been performed on the compound, such as photochemistry and thermal decomposition. Various factors such as temperature, oxidant and ionic strength were considered.
For example, it was found that the oxalate compound containing a single molecule of oxalic acid could be dissolved in 73.7 grams of potassium oxalate. This solution was filtered to remove excess lead peroxide, and the color of the resulting solution was analyzed for extinction coefficient. Interestingly, a white precipitate of polymerized products of acrylonitrile was also found in the presence of acrylonitrile.
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