NDLI: Extractive-Photometric Determination of Rhenium with Dimethylglyoxime and Thiocyanate Ion

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Extractive-Photometric Determination of Rhenium with Dimethylglyoxime and Thiocyanate Ion

Content Provider	Semantic Scholar
Copyright Year	2006
Abstract	The reduction of Re04 ion with tin(II) chloride in the presence of potassium thiocyanate gives a yellow complex which is extractable into diethyl ethers, isopentyl alcohol2 and chloroform containing tribenzylamine.3 Despite the fact that the valency of rhenium in this compound is not yet well established4-6, the formation of the thiocyanate complex still underlies various photometric methods'_9 for the determination of this element, perhaps because this procedure is so simple to use and has good sensitivity. However, there are many types of interference'' 10-12, mainly due to chromium, tungsten, vanadium, copper, Pt-metals, as well as oxidizing and reducing agents which interfere with the applicability of the method. This calls for effecting modifications in the often used thiocyanate method so as to reduce the interferences, particularly regarding the minimum level, and enhancing the sensitivity of the system in order to widen its scope. From a survey of the literature it appears that mixedligand complexes of rhenium have hardly received any attention for analytical purposes. It is therefore considered to be of interest to work with such systems in order to explore the possibilities for developing better methods for the separation and determination of rhenium. Since dimethylglyoxime (DMG) is known to form a non-extractable and unstable colored complex13,14 with rhenium in the presence of Sn2+ as the reluctant, this reagent was not considered to be useful by itself for the determination of rhenium, due to the indefinite composition of the resulting species. However, it has been found that in combination with thiocyanate, DMG farms a stable yellowish-brown complex with the reduced perrhenate ion. The resulting Re-complex has quantitative extractability with diantipyrylmethane into 1,2-dichloroethane, which forms the basis for the spectrophotometric determination of rhenium based on the following experimental details.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://www.jstage.jst.go.jp/article/analsci1985/9/3/9_3_409/_pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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