Rhenium complexes chromatography

Finally, insertion of alkynes into dihydrogen mononuclear cationic rhenium complexes, stabilized by the triphos (= l,l,l-tris(diphenylphosphinomethyl)ethane) ligand, leads to vinylidene derivatives which react with water or ethanol eliminating silanols or methane, Fig. 18. Solvents were acetone or THF no chromatography was used. 

A more efficient method of paper chromatography was developed by Beckman and Lederer making use of the formation of a technetiiun complex with thiourea in nitric acid. TcO is reduced by this reagent, in contrast to ReO". The paper is eluted with 2 N HCl. The R, values of technetium and rhenium have been found to be very different, namely 0.2 and 0.7, respectively. 

Dry distillation and gas phase separation of technetium oxides from oxides of rhenium, osmium, iridium, and ruthenium by temperature-programmed gas chromatography using O2 as reactive gas was reported [109]. Furthermore, the separation of technetium chloride (TeCU) from volatile chlorides of numerous elements by thermo-chromatography combined with complex formation was investigated. The separation tube had a temperature gradient from 600 to 25 °C and was coated with KCl, CsCI, NaCl, and BaClj [HOj. 

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