Renium(V) complexation with <Emphasis Type="Italic">N</Emphasis>-ethylthiourea |
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Authors: | A A Amindzhanov F Dzh Dzhamoliddinov S M Safarmamadov Dzh A Davlatshoeva |
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Institution: | 1.Tajik National University,Dushanbe,Tajikistan |
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Abstract: | The stepwise complexation of rhenium(V) with N-ethylthiourea has been studied by the potentiometric method in 6 mol/L HCI at 298 K. It has been found that rhenium(V) forms five complex species with this ligand of the following compositions: ReOLCl4]?, ReOL2Cl3], ReOL3Cl2]+, ReOL4Cl]2+, and ReOL5]3+. The calculated logarithms of stepwise formation constants of the complexes are the following: logK1 = 4.10 ± 0.05, logK2 = 3.16 ± 0.02, logK3 = 2.61 ± 0.02, logK4 = 2.26 ± 0.02, and logK5 = 1.80 ± 0.02. It has been shown that the introduction of the ethyl radical into the thiourea molecule leads to an increase in the stability of rhenium(V) complexes. |
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