Furil-a-dioxime

The reagent consists of a 10 per cent solution of a-furil-dioxime in alcohol. 

Nevertheless, if a comparison is made of the literature data on equilibrium measurements in dioxane-water solvent mixtures, more data are to be found which contradict the above conclusions than those which support them. In order to investigate this question, Gaizer et al [Ga 74b] determined the stability constants of the iodide mixed complexes obtained from three cobalt(III) dioxime parent complexes, in solvent mixtures with a dioxane content of 10-75%. The three dioximes were dimethylglyoxime, cyclohexanedione dioxime (Nioxime) and furil dioxime. The results are given in Table 8.4, together with the stoichiometric constants determined in solutions of ionic strengths of 0.1 m, and also the thermodynamic constants obtained with the activity coefficients calculated for the various solvent mixtures (with a knowledge of their relative permittivities). A comparison of the data obtained in the different solvent mixtures is possible only in the case of the... 

The data indicate that in the concentration range investigated, the dimethyl-glyoxime and Nioxime parent complexes coordinate a single iodide ion each, while the furil dioxime parent complex is able to coordinate two iodide ions. The log values increase with an increase in the dioxane content of the solvent, i.e., with a... 

Ligand abbreviations rngH = methylglyoxime, a-fdH2 = furil dioxime, bdHg = benzil dioxime. 

Care must be taken that ferric and cobalt salts are not both present (see page 328). Instead of dimethylglyoxime, it is possible to use cyclohexane-1,2-dionedioxime (Nioxime),2 furil-a-dioxime and benzil-a-dioxime as reagents for Ni. 

---