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Special Issue "Advanced Ligands for Coordination Chemistry"

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Dear Colleagues,

Coordination chemistry is a huge and very important field in modern chemical science. Coordination compounds are integral in modern catalytic transformations, material science, separation technologies, biological processes, and other fields. In principle, the classical coordination compound consists of two parts: the metal cation and the ligand(s). The Periodic Table displays a restricted amount of metals. In contrast, the design and synthesis of new ligands have established new frontiers in coordination chemistry. Therefore, this Special Issue focuses on the ligands used for coordination chemistry. All fundamental or practically oriented aspects of this field within this Special Issue include the design, synthesis, and study of coordination properties of ligands; their use for separation techniques; the photo-physical properties of ligands and their complexes; and many others. All colleagues active in this field are invited to contribute to this Special Issue by presenting original papers or short reviews in the field.

Prof. Dr. Valentine G. Nenajdenko
Guest Editor

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Keywords

ligand
complex
separation
coordination chemistry
extraction
lanthanide
actinide
metal

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Research

19 pages, 8552 KiB

Open AccessArticle

First 24-Membered Macrocyclic 1,10-Phenanthroline-2,9-Diamides—An Efficient Switch from Acidic to Alkaline Extraction of f-Elements

Vitaly A. Roznyatovsky

Igor P. Gloriozov

Alexandr V. Yatsenko

Viktor A. Tafeenko

Pavel V. Dorovatovskii

and

Valentine G. Nenajdenko

Int. J. Mol. Sci. 2023, 24(12), 10261; https://doi.org/10.3390/ijms241210261 - 17 Jun 2023

Cited by 1 | Viewed by 790

Abstract

A reaction of acyl chlorides derived from 1,10-phenanthroline-2,9-dicarboxylic acids with piperazine allows the preparation of the corresponding 24-membered macrocycles in good yield. The structural and spectral properties of these new macrocyclic ligands were thoroughly investigated, revealing promising coordination properties towards f-elements (Am, Eu). It was shown that the prepared ligands can be used for selective extraction of Am(III) from alkaline–carbonate media in presence of Eu(III) with an SF_Am/Eu up to 40. Their extraction efficiency is higher than calixarene-type extraction of the Am(III) and Eu(III) pair. Composition of macrocycle–metal complex with Eu(III) was investigated by luminescence and UV-vis spectroscopy. The possibility of such ligands to form complexes of L:Eu = 1:2 stoichiometry is revealed. Full article

(This article belongs to the Special Issue Advanced Ligands for Coordination Chemistry)

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14 pages, 3837 KiB

Open AccessArticle

Pyrrolidine-Derived Phenanthroline Diamides: An Influence of Fluorine Atoms on the Coordination of Lu(III) and Some Other f-Elements and Their Solvent Extraction

and

Valentine G. Nenajdenko

Int. J. Mol. Sci. 2023, 24(6), 5569; https://doi.org/10.3390/ijms24065569 - 14 Mar 2023

Cited by 3 | Viewed by 956

Abstract

Three pyrrolidine-derived phenanthroline diamides were studied as ligands for lutetium trinitrate. The structural features of the complexes have been studied using various spectral methods and X-ray. The presence of halogen atoms in the structure of phenanthroline ligands has a significant impact on both the coordination number of lutetium and the number of solvate water molecules in the internal coordination sphere. The stability constants of complexes with La(NO₃)₃, Nd(NO₃)₃, Eu(NO₃)₃, and Lu(NO₃)₃ were measured to demonstrate higher efficiency of fluorinated ligands. NMR titration was performed for this ligand, and it was found that complexation with lutetium leads to an approximately 13 ppm shift of the corresponding signal in the ¹⁹F NMR spectrum. The possibility of formation of a polymeric oxo-complex of this ligand with lutetium nitrate was demonstrated. Experiments on the liquid–liquid extraction of Am(III) and Ln(III) nitrates were carried out to demonstrate advantageous features of chlorinated and fluorinated pyrrolidine diamides. Full article

(This article belongs to the Special Issue Advanced Ligands for Coordination Chemistry)

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Special Issue "Advanced Ligands for Coordination Chemistry"

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