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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