[en] A solvent extraction method with TBP as an extractant was used for the determination of the stability constants K₁⁰ for the SmNO₃²⁺ complex, for different least approach distances aa of ions. It was established that aa=6.5A for SmNO₃²⁺. (Author)

[en] The stability constants of the Sm(NO₃)²⁺ complex were determined at three temperatures, using the solvent extraction method. It was found that: K⁰₁ = 63,6 at 17^OC, 30,3 at 35^OC, 20,1 at 50^OC. This corresponds with the formation of a Sm(H₂O)(NO₃)²⁺ complex at 17^OC and a Sm(H₂O)₂(NO₃)²⁺ complex at 50^OC. (Author)

[en] The stability constants of Pr, Sm thiocyanate complexes were determined. It was found that the stability constants are lower than those found for Nd. The molar absorptivities of Sm thiocyanate solutions changed in a way which suggested the existence of an equilibrium of inner- and outersphere complexation

[en] The extraction seperation of La and Sm by benzyldibutilamyne (BDBA) from an aqueous solution containing 6 mol*dm^-3 NaNO₃ and 0.5 mol*dm^-3 HNO₃ is not very efficient. It may remarkebly be improved by addition of a complexing agent, 2-hydroxyethylenedyaminetriacetic acid (HEDTA). The effect of preferential La extraction into the organic phase together with the effect of preferential complexation of Sm in the aqueous phase may lead, by proper choice of the complexing agent concentration, to a 7-10 fold increase in α_LA/Sm values. The procedure described here enables fairly good separation of a major from minor elements. (author) 16 refs.; 9 figs.; 2 tabs

[en] The hydration number of Sm(III) has been obtained by using the difference in the decay rate constants in H₂O and D₂O solutions. In general, k_obs(H₂O) >> k_obs(D₂O), k_obs(D₂O) ≅ constant, and ligands are not as effective in causing non-radiative de-excitation of the excited state. For Sm(III), a relationship has been proposed in which the hydration number is related directly to the decay rate constant in H₂O. If there is no contribution from the ligand to the de-excitation of the luminescence excited state, the hydration of Sm(III) in the different complexes can be obtained directly from the values of k_obs measured in H₂O. The number and the geometric distribution of solvent molecules around a metal ion in solution are an important factor in the structural and chemical behavior of cation. Indeed, such information has been utilized to design novel ionophores and receptors. However, there have been few studies of hydration structure for lanthanides. The fact that many f-element salts which have relatively large lattice energies are fairly soluble in water is a reflection of the strength of the interactions between the metal cations and water molecules

[en] An unprecedentate samarium complex of the molecular composition [{κ³-{(Ph₂CH)N=CH}₂C₄H₂N}{κ³-{(Ph₂CHN=CH)(Ph₂CHNCH)C₄H₂N}Sm}₂] (2), which was isolated by the reaction of a potassium salt of 2,5-bis{N-(diphenylmethyl)-iminomethyl}pyrrolyl ligand [K(THF)₂{(Ph₂CH)N=CH}₂C₄H₂N] (1) with anhydrous samarium diiodide in THF at 60 C through the in situ reduction of imine bond is presented. The homoleptic samarium complex [[κ³-{(Ph₂CH)-N=CH}₂C₄H₂N]₃Sm] (3) can also be obtained from the reaction of compound 1 with anhydrous samarium triiodide (SmI₃) in THF at 60 C. The molecular structures of complexes 2 and 3 were established by single-crystal X-ray diffraction analysis. The molecular structure of complex 2 reveals the formation of a C-C bond in the 2,5-bis{N-(diphenylmethyl)iminomethyl}pyrrole ligand moiety (Ph₂Py^-). However, complex 3 is a homoleptic samarium complex of three bis-iminopyrrolyl ligands. In complex 2, the samarium ion adopts an octahedral arrangement, whereas in complex 3, a distorted three face-centered trigonal prismatic mode of nine coordination is observed around the metal ion. (copyright 2017 WILEY-VCH Verlag GmbH and Co. KGaA, Weinheim)

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[en] The stability constants of complexes formed by Pu(III) and Sm(III) with the well known extractant 1-phenyl 3-methyl 4-benzoyl pyrazolone-5 (PMBP) were determined in 70 per cent dioxane-30 per cent water medium at 25deg employing the pH titration technique. The stability constants of Pu(III) and Sm(III) complexes were found to be close to each other in accordance with the ionic radii of the metal ions. (author). 6 refs