Chemistry is traditionally divided into organic and inorganic chemistry. The former is the study of compounds containing at least one carbon-hydrogen bonds. 325855-74-1, Name is 5-Chloro-6′-methyl-3-(4-(methylsulfonyl)phenyl)-[2,3′-bipyridine] 1′-oxide, molecular formula is C18H15ClN2O3S, belongs to pyridine-derivatives compound, is a common compound. In a patnet, author is Bhattacharyya, Arunasis, once mentioned the new application about 325855-74-1, Name: 5-Chloro-6′-methyl-3-(4-(methylsulfonyl)phenyl)-[2,3′-bipyridine] 1′-oxide.
Unfolding the complexation and extraction of Am3+ and Eu3+ using N-heterocyclic aromatic diphosphonic acids: a combined experimental and DFT study
Phosphonate based ligands are well known for the extraction of ‘f’ block elements. Three N,O-donor N-heterocyclic aromatic diphosphonate ligands were evaluated in the present work for the extraction/separation studies of Am3+ and Eu3+. Complexation studies in aqueous medium using luminescence titration indicated the formation of anionic complexes in the case of Eu3+. Two phase liquid-liquid extraction studies were, therefore, carried out by employing Aliquat-336 as the liquid anion exchanger. The results indicated the formation of a species with a metal-ligand stoichiometry of 1:3 in the case of pyridine-2,6-diphosphonic acid (PyPOH). In the case of 2,2 ‘ -bipyridine-6,6 ‘ -diphosphonic acid (BipyPOH), however, a 1:2 complex was extracted and 1,10-phenanthroline-2,9-diphosphonic acid (PhenPOH) extracts the Am3+ and Eu3+ ions by forming both 1:2 and 1:3 complexes. Formation of these kinds of anionic complexes was further confirmed using electrospray ionization mass spectrometry (ESI-MS). DFT calculations predicted the structure of the anionic complexes. The non-selectivity of these kinds of ligands between Am3+ and Eu3+ was attributed to the presence of unfavorable covalent interactions in the metal-ligand bonds.
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Reference:
Pyridine – Wikipedia,
,Pyridine | C5H5N – PubChem