Thorium redox chemistry is extremely scarce due to the high stability of ThIV. Here we report two unique examples thorium arenide complexes prepared by reduction a ThIV-siloxide complex in presence naphthalene, mononuclear [K(OSi(OtBu)3)3Th(η6-C10H8)] (1) and inverse-sandwich [K(OSi(OtBu)3)3Th]2(μ-η6,η6-C10H8)] (2). The electrons stored these allow broad range substrates (N2O, AdN3, CO2, HBBN)....

The present paper concerns on the selective and very efficient transport of thorium(IV) ions from aqueous solutions through an emulsion liquid membranes composed by paraffin and a surfactant, without carrier requirement. The influence of pH of the external aqueous phase, the surfactant concentration in the membrane phase, the type, and concentration of th...

On the basis of optimized grinding/heating cycles developed for several phosphate-based ceramics, the preparation of brabantite and then monazite/brabantite solid solutions loaded with tetravalent thorium, uranium, and cerium (as a plutonium surrogate) was examined versus the heating temperature. The chemical reactions and transformations occurring when heating the initial mixtures of AnO2/CeO2...

The factors influencing the level of U-232 contamination in U-233 are examined for heavy-water-moderated, light-water-moderated and liquid-metal cooled fast breeder reactors fueled with natural or low-enriched uranium and containing thorium mixed with the uranium or in separate target channels. U-232 decays with a 69-year half-life through 1.9-year half-life Th-228 to Tl-208, which emits a 2.6 ...

The values of K~ for sulfoacetic and 3-sulfop:i:'oBionic acids were determined potentiometrically. The values are (8.6 t 0.3) x 10-~ and (3.0 t O.l) x lo-5, respectively. These values or Ka2 were much lower. than those predicted by the Branch and Calvin equation for the calculation of values or pKa of derivf.tives of acetic acid. The presence of intramolecular hydrogen bonds in sulfoacetate and...

Since the 1960s, thorium isotopes occupy a special place in the oceanographer’s toolbox as tracers for determining rates and mechanisms of oceanic scavenging, particle dynamics, and carbon fluxes. Due to their unique and constant production rates from soluble parent nuclides of uranium and radium, their disequilibrium can be used to calculate rates and time scales of sinking particles. In addit...