ChemInform Abstract: SUBSTITUENT EFFECTS ON THE STABILITY CONSTANTS OF CHELATES OF SOME TRIVALENT LANTHANIDE IONS WITH BENZOYLACETARYLAMIDES

1978 ◽  
Vol 9 (22) ◽  
Author(s):  
A. S. SHAWALI ◽  
A. E. ELHILALY
Keyword(s):  
Stability Constants ◽  
Substituent Effects ◽  
Lanthanide Ions ◽  
Trivalent Lanthanide ◽  
The Stability

Complexation of Actinides with Amide Derivatives of Oxydiacetic Acid

2005 ◽  
Vol 893 ◽  
Author(s):  
Linfeng Rao ◽  
Guoxin Tian
Keyword(s):  
Stability Constants ◽  
Structural Information ◽  
Lanthanide Ions ◽  
Carboxylate Groups ◽  
Amide Derivatives ◽  
Ether Oxygen ◽  
The Difference ◽  
Solid Compounds ◽  
The Stability ◽  
Oxydiacetic Acid

AbstractComplexation of Np(V), U(VI) and Nd(III) with dimethyl-3-oxa-glutaramic acid (DMOGA) and tetramethyl-3-oxa-glutaramide (TMOGA) was studied in comparison with the complexation with oxydiacetic acid (ODA). Stability constants and enthalpy of complexation were determined by potentiometry, spectrophotometry and calorimetry. Thermodynamic parameters, in conjunction with structural information of solid compounds, indicate that DMOGA and TMOGA form tridentate complexes with the ether-oxygen participating in bonding with actinide/lanthanide ions. The trends in the stability constants, enthalpy and entropy of complexation are discussed in terms of the difference in the hydration of the amide groups and carboxylate groups and the difference in the charge density of the metal ions.

scholarly journals Expanding the Scope of Pyclen-Picolinate Lanthanide Chelates to Po-Tential Theranostic Applications

2020 ◽  
Author(s):  
Gwladys Nizou ◽  
Chiara Favaretto ◽  
Francesca Borgna ◽  
Pascal V. Grundler ◽  
Nathalie Saffon-Merceron ◽  
...  
Keyword(s):  
Solid State ◽  
Dft Calculations ◽  
Stability Constants ◽  
High Stability ◽  
Lanthanide Ions ◽  
Lanthanide Chelates ◽  
The Stability ◽  
Theranostic Applications ◽  
First Time ◽  
Very High

A family of three picolinate pyclen based ligands, previously investigated for the complexation of Y<sup>3+</sup> and some lanthanide ions (Gd<sup>3+</sup>, Eu<sup>3+</sup>), was studied with <sup>161</sup>Tb and <sup>177</sup>Lu in view of potential radiotherapeutic applications. The set of six Tb<sup>3+ </sup>and Lu<sup>3+ </sup>complexes was synthesized and fully characterized. The coordination properties in the solid state and in solution were thoroughly studied. Potentiometric titrations, corroborated by DFT calculations, showed the very high stability constants of the Tb<sup>3+</sup> and Lu<sup>3+</sup> complexes, which are associated to remarkable kinetic inertness. A complete radiolabeling study performed with both<sup> 161</sup>Tb and <sup>177</sup>Lu radionuclides, including experiments with regard to the stability with and without scavengers and kinetic inertness using challenging agents, proved that the ligands could reasonably compete with the DOTA analogue. To conclude, the potential of using the same ligand for both radiotherapy and optical imaging was highlighted for the first time.

scholarly journals Expanding the Scope of Pyclen-Picolinate Lanthanide Chelates to Po-Tential Theranostic Applications

2020 ◽  
Author(s):  
Gwladys Nizou ◽  
Chiara Favaretto ◽  
Francesca Borgna ◽  
Pascal V. Grundler ◽  
Nathalie Saffon-Merceron ◽  
...  
Keyword(s):  
Solid State ◽  
Dft Calculations ◽  
Stability Constants ◽  
High Stability ◽  
Lanthanide Ions ◽  
Lanthanide Chelates ◽  
The Stability ◽  
Theranostic Applications ◽  
First Time ◽  
Very High

A family of three picolinate pyclen based ligands, previously investigated for the complexation of Y<sup>3+</sup> and some lanthanide ions (Gd<sup>3+</sup>, Eu<sup>3+</sup>), was studied with <sup>161</sup>Tb and <sup>177</sup>Lu in view of potential radiotherapeutic applications. The set of six Tb<sup>3+ </sup>and Lu<sup>3+ </sup>complexes was synthesized and fully characterized. The coordination properties in the solid state and in solution were thoroughly studied. Potentiometric titrations, corroborated by DFT calculations, showed the very high stability constants of the Tb<sup>3+</sup> and Lu<sup>3+</sup> complexes, which are associated to remarkable kinetic inertness. A complete radiolabeling study performed with both<sup> 161</sup>Tb and <sup>177</sup>Lu radionuclides, including experiments with regard to the stability with and without scavengers and kinetic inertness using challenging agents, proved that the ligands could reasonably compete with the DOTA analogue. To conclude, the potential of using the same ligand for both radiotherapy and optical imaging was highlighted for the first time.

Bond-length distributions for ions bonded to oxygen: Results for the lanthanides and actinides and discussion of the f-block contraction

2017 ◽  
Author(s):  
Olivier Charles Gagné
Keyword(s):  
Bond Length ◽  
Coordination Number ◽  
Lanthanide Ions ◽  
Lanthanide Contraction ◽  
Trivalent Lanthanide ◽  
Actinide Ions

Bond-length distributions have been examined for eighty-four configurations of the lanthanide ions and twenty-two configurations of the actinide ions bonded to oxygen. The lanthanide contraction for the trivalent lanthanide ions bonded to O<sup>2-</sup> is shown to vary as a function of coordination number and to diminish in scale with increasing coordination number.

Extraction of strontium and barium salts by the nitrobenzene solution of dicarbolide in the presence of glymes

1985 ◽  
Vol 50 (3) ◽  
pp. 581-599 ◽  
Author(s):  
Petr Vaňura ◽  
Emanuel Makrlík
Keyword(s):  
Stability Constants ◽  
Organic Phase ◽  
Equilibrium Constants ◽  
Minor Role ◽  
Nitrobenzene Solution ◽  
Ligand Structure ◽  
Stability Constants Of Complexes ◽  
Separation Factors ◽  
The Stability ◽  
A Minor

Extraction of microamounts of Sr2+ and Ba2+ (henceforth M2+) from the aqueous solutions of perchloric acid (0.0125-1.02 mol/l) by means of the nitrobenzene solutions of dicarbolide (0.004-0.05 mol/l of H+{Co(C2B9H11)2}-) was studied in the presence of monoglyme (only Ba2+), diglyme, triglyme, and tetraglyme (CH3O-(CH2-CH2O)nCH3, where n = 1, 2, 3, 4). The distribution of glyme betweeen the aqueous and organic phases, the extraction of the protonized glyme molecule HL+ together with the extraction of M2+ ion and of the glyme complex with the M2+ ion, i.e., ML2+ (where L is the molecule of glyme), were found to be the dominating reactions in the systems under study. In the systems with tri- and tetraglymes the extraction of H+ and M2+ ions solvated with two glyme molecules, i.e., the formation of HL2+ and ML22+ species, can probably play a minor role. The values of the respective equilibrium constants, of the stability constants of complexes formed in the organic phase, and the theoretical separation factors αBa/Sr were determined. The effect of the ligand structure on the values of extraction and stability constants in the organic phase is discussed.

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