Speciation of heptavalent technetium in sulfuric acid: structural and spectroscopic studies.

@article{Poineau2010SpeciationOH,
  title={Speciation of heptavalent technetium in sulfuric acid: structural and spectroscopic studies.},
  author={Frederic Poineau and Philippe F. Weck and Konstantin E German and Alesya Ya. Maruk and Gayane A. Kirakosyan and Wayne W. Lukens and Daniel B. Rego and Alfred P. Sattelberger and Kenneth R. Czerwinski},
  journal={Dalton transactions},
  year={2010},
  volume={39 37},
  pages={
          8616-9
        }
}
The speciation of Tc(vii) was studied in 12 M H(2)SO(4) by NMR, UV-visible and XAFS spectroscopy. Experimental results and density functional calculations show the formation of TcO(3)(OH)(H(2)O)(2). 

Reactivity of HTcO(4) with methanol in sulfuric acid: Tc-sulfate complexes revealed by XAFS spectroscopy and first principles calculations.

TLDR
Experimental results and first principles calculations show the formation of Tc(+5) sulfate complexes, which expand the fundamental understanding of TC in high acid solutions.

Behavior of heptavalent technetium in concentrated triflic acid under alpha-irradiation: technetium-triflate complex characterized by X-ray absorption fine structure spectroscopy and DFT

Abstract The nature of the Tc species produced after the alpha-irradiation of Tc(VII) in concentrated triflic acid has been investigated by X-ray absoprtion fine structure (XAFS) spectroscopy and

First evidence for the formation of technetium oxosulfide complexes: synthesis, structure and characterization.

TLDR
Experimental results and density functional calculations provide the first evidence for the formation of a TcO(3)S(-) precursor.

Speciation of Technetium in Sulfuric Acid/Hydrogen Sulfide Solutions

The reaction between TcVII and H2S(g) in 12 M H2SO4 has been studied. This reaction produced a black solid and a brown supernate. The solid was analyzed by energy dispersive X-ray (EDX) and X-ray

Behavior of heptavalent technetium in sulfuric acid under α-irradiation: structural determination of technetium sulfate complexes by X-ray absorption spectroscopy and first principles calculations.

TLDR
Extended X-ray absorption fine structure (EXAFS) spectroscopy measurements are consistent with the presence of mononuclear technetium sulfate complexes, indicating that Tc(VII) is reduced to T c(V) under α-irradiation.

Speciation of technetium peroxo complexes in sulfuric acid revisited

The reaction of Tc(+7) with H2O2 has been studied in H2SO4 and the speciation of technetium performed by UV–visible and 99-Tc NMR spectroscopy. UV–visible measurements show that for H2SO4 ≥ 9 M and

Extraction of moderate oxidation state technetium species between 30 % tri-n-butyl phosphate and H2SO4/HNO3

  • M. Chotkowski
  • Chemistry
    Journal of Radioanalytical and Nuclear Chemistry
  • 2015
TLDR
The distribution ratios of 99Tc with lower than +VII oxidation state ionic species between 4 M H2SO4 and 30 % TBP/kerosene were found and are significantly lower than for TcO4− in the same solution.

Diperoxo Pertechnetic Acid Characterized by Spectroscopic and Quantum Chemical Studies

The reaction of Tc(+7) with H2O2 has been studied in HNO3 and the speciation of technetium was performed by UV/Vis spectroscopic analysis. UV/Vis measurements show that for HNO3 concentrations of

References

SHOWING 1-10 OF 31 REFERENCES

Technetium complexes with triazacyclononane.

TLDR
The reaction with aqueous HCl results in reduction and the formation of the cationic technetium(III) complex [TcCl2(OH2)(tacn)]Cl and the products were isolated in crystalline form and studied spectroscopically and by X-ray diffraction.

Structural (EXAFS) and solution equilibrium studies on the oxotechnetium(V) complexes TcOX4- and TcOX52- (X = Cl, Br)

Etude par spectroscopie Raman de l'equilibre entre TcOCl 4 − et TcOCl 5 2− en solutions HCl12M et CH 2 Cl 2 . Dans les deux milieux, la coordination 5 est dominante, mais en milieu aqueux, il y a

Pertechnetyl Fluorosulfate, [TcO3]+[SO3F]−

A one step synthesis of [TcO3]+[SO3F]− is reported. The compound is volatile at room temperature and has according to calculations a tetrahedral coordination around Tc and a monodentate SO3F group.

The first step of oxidation of alkylbenzenes by permanganates in acidic aqueous solutions

Data on the kinetics, kinetic isotope effects, substrate selectivety, and activation parameters for the first step of oxidation of alkylbenzenes by permanganante in acidic aqueous solutions are

The reactions of the chromate, dichromate, and permanganate ions with 100% sulfuric acid and dilute oleum

Solutions of potassium chromate and potassium dichromate in 100% sulfuric acid and dilute oleum have been investigated by cryoscopic and conductimetric methods. It is shown that they both react to

High-valent technetium complexes with the [(99)TcO(3)](+) core from in situ prepared mixed anhydrides of [(99)TcO(4)](-) and their reactivities.

TLDR
With the perspective of radiopharmaceutical applications, water stability and reactivities toward alkenes are described, and a distinct widening of the O-Tc-O angles is shown, almost to a tetrahedral angle.

Syntheses of high-valent fac-[99mTcO3]+ complexes and [3+2] cycloadditions with alkenes in water as a direct labelling strategy.

TLDR
New opportunities in technetium chemistry are enabled with a high potential for medicinal and biological applications and the presented strategy is ligand and not metal-centred.