The lanthanide complexes of 2,2′-bipyridyl-6,6′-dicarboxylic dimethylanilides: the influence of a secondary coordination sphere on the stability, structure, luminescence and f-element extraction

Borisova, Nataliya E.; Sumyanova, Tsagana B.; Kharcheva, Anastasia V.; Matveev, Petr I.; Ivanov, A. V.; Razumova, Elizaveta A.; Patsaeva, Svetlana V.

doi:10.1039/c8dt03734e

Cited by 25 publications

(32 citation statements)

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“…The tert-butoxycarbonyl can be utilized instead of acetyl group, which allows for increasing the yield of N-ethylaminopyridines up to 70-90%. Am(III) separation [11,12]. Such ligands effectively separate the ions of 4f-and 5f-elements-a crucial step of modern closed (waste-free) nuclear fuel cycle.…”

Section: Scheme 2 Ethylation and Hydrolysis Of N-acetylaminopyridinesmentioning

confidence: 99%

“…One of the promising classes of compounds for both f-metal separation and luminescent devices is derivatives of 2,2 -bipyridyl-6,6 -dicarboxylic acid (BPDA), which are tetradentate ligands of N,N ,O,O -type. Previously, it has been shown that tertiary amides of 2,2 -bipyridyl-6, 6 -dicarboxylic acid bearing substituted N-ethylanilines are potential materials for Am(III) separation [11,12]. Such ligands effectively separate the ions of 4f-and 5f-elements-a crucial step of modern closed (waste-free) nuclear fuel cycle.…”

Section: Introductionmentioning

confidence: 99%

“…Such ligands effectively separate the ions of 4f-and 5f-elements-a crucial step of modern closed (waste-free) nuclear fuel cycle. Moreover, their complexes with REE ions are of interest as potential luminescent materials [13], where the properties are also dependent on the substitution on the amidic moiety of the molecule [12]. Although the synthesis of substituted amides of 2,2 -bipyridyl-6,6 -dicarboxylic acid is already represented [12,13], the preparation of diamides of 2,2 -bipyridyl-6,6 -dicarboxylic acid that is based on heterocyclic amines has not been described in the literature.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, their complexes with REE ions are of interest as potential luminescent materials [13], where the properties are also dependent on the substitution on the amidic moiety of the molecule [12]. Although the synthesis of substituted amides of 2,2 -bipyridyl-6,6 -dicarboxylic acid is already represented [12,13], the preparation of diamides of 2,2 -bipyridyl-6,6 -dicarboxylic acid that is based on heterocyclic amines has not been described in the literature. In light of the above, it is interesting to compare the properties of diamides that are based on anilines and aminopyridines as well as photophysical properties of their complexes with lanthanides metals and metal extraction.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, these compounds and their complexes with metals can serve as convenient blocks in the synthesis of coordination polymers due to the coordination of the metal ion at the additional donor center-the nitrogen atom of the pyridine ring of the amide group. Am(III) separation [11,12]. Such ligands effectively separate the ions of 4f-and 5f-elements-a crucial step of modern closed (waste-free) nuclear fuel cycle.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Heterocyclic Ring on LnIII Coordination, Luminescence and Extraction of Diamides of 2,2′-Bipyridyl-6,6′-Dicarboxylic Acid

et al. 2019

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We have synthesized and examined several complexes of lanthanides with diamides of 2,2′-bipyridyl-6,6′-dicarboxylic acid bearing various hetaryl-based side chains for the elucidation of the effect of the heterocycle on the structure and properties of the ligands. The multigram scale methods for the preparation of various N-alkyl-hetaryls and their diamides were developed. The solid state structure of 6-methyl-2-pyridylamide of 2,2′-bipyridyl-6,6′-dicarboxylic acid possesses a flat structure where the conformation is completely different from that previously observed for N-alkylated 2,2′-bipyridyl-6,6′-dicarboxamides and 2,6-pyridinedicarboxamides. The complexes of new ligands were synthesized and NMR and X-Ray studied their structure in solution and solid state. The results demonstrate that complexes possess the same structures both in solid state and in solution. Stability constants of the complexes were less when comparing with dimethyl-substituted diamides, but higher than for unsubstituted dianilide. Contrarily, the extraction ability of 2-pyridyl-diamide is significantly lower than for corresponding anilide. Specific interaction of extractant with solvent molecules, which is not available for electron-sink pyridine amides, can explain this. The luminescence of new Eu complexes was significantly higher than for all previously 2,2′-bipyridyl-6,6′-dicarboxamides and QY reaches 18%. Asymmetry ratios of Eu complexes were 25% higher when compared other complexes with 2,2′-bipyridyl-6,6′-dicarboxamides, which indicates large deviation from the inversion center.

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Section: Scheme 2 Ethylation and Hydrolysis Of N-acetylaminopyridinesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%