Effect of 4(2)-Octylaminopyridine Distribution in a Water (HCl)/Chloroform System on the Extraction of Metal Ions from Chloride Solutions

Borshch, N. A.; Ageeva, L. S.; Frolova, A. Yu.

doi:10.1134/s0036024419050066

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…Conventionally, the 2-OAP molecule (Figure 1) [2], as well as the 4-OAP molecule (Figures 2 and 3) [5], can be represented as an average between the amine and pyridonimine limiting structures.…”

Section: Specificity 2(4)-aminopyridinesas Ligandsmentioning

confidence: 99%

“…2-OAP chloride with an intramolecular hydrogen bond passes into the organic phase and contains practically no water molecules, which apparently explains the low over stoichiometric extraction only from 12 M HCl [1]. On the contrary, for 4-OAP, a high over stoichiometric extraction is observed already from 6 M HCl, since in this case the chelate cycle based on the intramolecular hydrogen bond is not formed [5].…”

Section: Interionic Interactions In 2(4)-ap Associatesmentioning

confidence: 99%

“…Research carried out by the authors [5][6][7][8][9], allow us to get an idea of the specifics of the behavior of 2(4)-aminopyridines in the coordination and extraction processes of isolation and separation of metals.…”

Section: Introductionmentioning

confidence: 99%

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2(4)-Aminopyridines as Ligands in the Coordination and Extraction Chemistry of Platinum Metals

Ageeva¹,

Borsch²,

Kuvardin³

2023

Exploring Chemistry With Pyridine Derivatives

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The specific behavior of aromatic amines in the coordination and extraction processes of isolation and separation of platinum and other metals is discussed using the example of 2(4)-aminopyridines (2(4)-AP). As intrasphere ligands, 2(4)-AP have a high electron-donor capacity due to the pumping of an easily polarizable π-electron density. The chemistry of the extraction of platinum metals, iridium in particular, is considered: depending on the conditions, ion associates, coordination-solvated compounds or compounds containing an amine in the inner and outer coordination sphere of the metal are extracted. In the extraction of simple singly charged anions, there is a violation of the exchange-extraction series established for a large set of aliphatic amines. Soft anions (according to Pearson), for example, SCN- and I-, are best extracted, while for aliphatic amines such an anion is hard СlO4−. In the coordination compounds of platinum metals, 2(4)-AP acts as an electron donor, is coordinated by heterocyclic nitrogen with a redistribution of electron density not only to the accepting metal-complexing agent, but also further along the N-Me-X chain (X is an acido ligand in the composition of the complex), which leads to even greater covalence of the molecule as a whole.

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Section: Specificity 2(4)-aminopyridinesas Ligandsmentioning

confidence: 99%

Section: Interionic Interactions In 2(4)-ap Associatesmentioning

confidence: 99%