Search Results

You are looking at 1 - 7 of 7 items for

  • Author or Editor: L. Fuks x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

The position of Pu/III/ within lanthanides in respect to G0, H0 and S0 of complex formation with nitrate and thiocyanate ligands was determined by the extraction method. It was found that in respect to G0, Pu/III/ is a light pseudolanthanide for nitrate ligands and a heavy pseudolanthanide for thiocyanate ligands. A comparison of the positions of Pu/III/ and Am/III/ in respect to G0, H0 and S0 shows that the radius of plutonium is greater than that of americium in the An/NO3/ 5 2– complex and smaller in the An/NCS/3/TBP/n complex. The increase in the radii between plutonium and americium in the thiocyanate complex points out to a contribution from 5f orbitals to bonding.

Restricted access

Abstract  

The changes of the free energy, enthalpy and entropy accompanying the extraction of the U/VI/, Np/VI/ and Pu/VI/ by TBP have been determined by the method of extraction chromatography. The results obtained indicate outer-sphere complexation.

Restricted access

Abstract  

The extraction coefficients for the actinyl ions extracted with tri-n-butyl phosphate (TBP) from 2.0M CH3 COOH, CH2 ClCOOH and CCl3 COOH in various temperatures have been measured. Distinct discontinuities of the lnD vs. 1/T plots were interpreted as a proof for the extraction mechanism changes. Results obtained were used to calculate the thermodynamic functions of the actinyl complexation in the aqueous phase and of the partition process. It is proposed that the inner-sphere complex formation increases in the order acetates < chloroacetates < trichloroacetates.

Restricted access

Investigation of the extraction of actinyl ions with inorganic ligands

II. Extraction of U(VI), Np(VI) and Pu(VI) in the TBP-HCl and TBP-HClO4 systems

Journal of Radioanalytical and Nuclear Chemistry
Authors: L. Fuks and I. Fidelis

Abstract  

Extraction coefficients of actinyl ions have been determined by the method of extraction chromatography. Two systems have been studied and compared with the third one investigated earlier. Trends in extractability are interpreted as to be correlated with the properties of the inorganic ligand.

Restricted access

Investigation of extraction of actinyl ions with inorganic ligands

I. Extraction of U(VI), Np(VI) and Pu(VI) by the TBP-HNO3 system

Journal of Radioanalytical and Nuclear Chemistry
Authors: L. Fuks, S. Lis, and I. Fidelis

Abstract  

Extraction coefficients of hexavalent actinide ions have been determined by extraction chromatography, utilizing its selectivity towards oxidation states.

Restricted access

Abstract  

The radiosynthesis of [99mTc]-phenformin ([99mTc]-1-phenethylbiguanide) complex and its suitability as precursor of the radiopharmaceuticals for the tumor imaging was assessed. Radiochemical purity of the [99mTc]-complex was determined using radio-TLC and was studied by the HPLC with radiochemical detection, while its stability in challenge experiments. The results show, that due to the sufficient stability and lipophilicity of the complex, it fulfills our expectations for promising radiopharmaceutical precursor not only for the diagnostic agent, but also for the drug suitable for the oncological Auger electron therapy.

Restricted access

Abstract  

Technetium(I) tricarbonyl complexes may form with the pyridine aldehyde thiosemicarbazones (TSCs), in which chelating ligand is bound tri- or bidentately. Intend of the presented work was to check, if labeling the N-heterocyclic TSCs with tricarbonyl [99mTc]-technetium(I) may lead to formation of the complexes suitable for the radiopharmaceutical purposes. Syntheses of the complexes were provided in the conditions analogous to those performed in the nuclear medicine laboratories. Main physicochemical properties of the complexes important in the medicinal chemistry were studied. Relevant results of the numerical calculations remain in fair agreement with these properties.

Restricted access