Thorium(IV) and Uranium(IV) Complexes with 2,6-Dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea) Ligands
The reaction of thorium nitrate hydrate with 2,6-dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea), H<sub>2</sub>L<sup>pic</sup>, results in the hydrolysis of the organic ligand and the formation of [Th(2,6-dipicolinolate)<sub>2</sub>(H<...
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2025-01-01
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| author | Christelle Njiki Noufele Juliane März Ulrich Abram |
| author_facet | Christelle Njiki Noufele Juliane März Ulrich Abram |
| author_sort | Christelle Njiki Noufele |
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| description | The reaction of thorium nitrate hydrate with 2,6-dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea), H<sub>2</sub>L<sup>pic</sup>, results in the hydrolysis of the organic ligand and the formation of [Th(2,6-dipicolinolate)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>] (<b>1</b>). Hydrolysis can be avoided by the use of [ThCl<sub>4</sub>(DME)<sub>2</sub>] (DME = 1,2-dimethoxyethane) as the starting material and the exclusion of water. The product, [Th(L<sup>pic</sup>)<sub>3</sub>]<sup>2−</sup> (<b>2</b>), crystallizes as diammonium salt in form of yellow crystals in moderate yields. The thorium ion in the complex is nine-coordinate by the central <i>O</i>,<i>N</i>,<i>O</i> donor atoms of three deprotonated {L<sup>pic</sup>}<sup>2−</sup> ligands. The sulfur atoms of the ligands do not bind to the actinide ion, but establish hydrogen bonds to the ammonium counter ions. A similar coordination sphere is also observed in the uranium(IV) complex [UAu<sub>2</sub>(L<sup>pic</sup>)<sub>3</sub>}] (<b>3</b>), which was obtained from a reaction between H<sub>2</sub>L<sup>pic</sup>, [U<sub>2</sub>I<sub>6</sub>(1,4-dioxane)<sub>3</sub>] and [AuCl(tht)] (tht = tetrahydrothiophene) in the presence of triethylamine. Charge compensation is established by the linear coordination of two Au<sup>+</sup> ions between each two sulfur atoms of the ligands. The products have been studied by X-ray diffraction and IR spectroscopy. The actinide ions in both {L<sup>pic</sup>}<sup>2−</sup> complexes have coordination number nine, but establish slightly different coordination spheres. |
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| spelling | doaj-art-094e35bd8d854c099266e5568666bdce2025-08-20T01:48:45ZengMDPI AGMolbank1422-85992025-01-0120251M195710.3390/M1957Thorium(IV) and Uranium(IV) Complexes with 2,6-Dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea) LigandsChristelle Njiki Noufele0Juliane März1Ulrich Abram2Institute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstr. 34/36, D-14195 Berlin, GermanyInstitute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstr. 400, D-01328 Dresden, GermanyInstitute of Chemistry and Biochemistry, Freie Universität Berlin, Fabeckstr. 34/36, D-14195 Berlin, GermanyThe reaction of thorium nitrate hydrate with 2,6-dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea), H<sub>2</sub>L<sup>pic</sup>, results in the hydrolysis of the organic ligand and the formation of [Th(2,6-dipicolinolate)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>] (<b>1</b>). Hydrolysis can be avoided by the use of [ThCl<sub>4</sub>(DME)<sub>2</sub>] (DME = 1,2-dimethoxyethane) as the starting material and the exclusion of water. The product, [Th(L<sup>pic</sup>)<sub>3</sub>]<sup>2−</sup> (<b>2</b>), crystallizes as diammonium salt in form of yellow crystals in moderate yields. The thorium ion in the complex is nine-coordinate by the central <i>O</i>,<i>N</i>,<i>O</i> donor atoms of three deprotonated {L<sup>pic</sup>}<sup>2−</sup> ligands. The sulfur atoms of the ligands do not bind to the actinide ion, but establish hydrogen bonds to the ammonium counter ions. A similar coordination sphere is also observed in the uranium(IV) complex [UAu<sub>2</sub>(L<sup>pic</sup>)<sub>3</sub>}] (<b>3</b>), which was obtained from a reaction between H<sub>2</sub>L<sup>pic</sup>, [U<sub>2</sub>I<sub>6</sub>(1,4-dioxane)<sub>3</sub>] and [AuCl(tht)] (tht = tetrahydrothiophene) in the presence of triethylamine. Charge compensation is established by the linear coordination of two Au<sup>+</sup> ions between each two sulfur atoms of the ligands. The products have been studied by X-ray diffraction and IR spectroscopy. The actinide ions in both {L<sup>pic</sup>}<sup>2−</sup> complexes have coordination number nine, but establish slightly different coordination spheres.https://www.mdpi.com/1422-8599/2025/1/M1957thoriumuraniumgoldactinidesaroylthioureas |
| spellingShingle | Christelle Njiki Noufele Juliane März Ulrich Abram Thorium(IV) and Uranium(IV) Complexes with 2,6-Dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea) Ligands Molbank thorium uranium gold actinides aroylthioureas |
| title | Thorium(IV) and Uranium(IV) Complexes with 2,6-Dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea) Ligands |
| title_full | Thorium(IV) and Uranium(IV) Complexes with 2,6-Dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea) Ligands |
| title_fullStr | Thorium(IV) and Uranium(IV) Complexes with 2,6-Dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea) Ligands |
| title_full_unstemmed | Thorium(IV) and Uranium(IV) Complexes with 2,6-Dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea) Ligands |
| title_short | Thorium(IV) and Uranium(IV) Complexes with 2,6-Dipicolinoylbis(<i>N</i>,<i>N</i>-diethylthiourea) Ligands |
| title_sort | thorium iv and uranium iv complexes with 2 6 dipicolinoylbis i n i i n i diethylthiourea ligands |
| topic | thorium uranium gold actinides aroylthioureas |
| url | https://www.mdpi.com/1422-8599/2025/1/M1957 |
| work_keys_str_mv | AT christellenjikinoufele thoriumivanduraniumivcomplexeswith26dipicolinoylbisiniinidiethylthiourealigands AT julianemarz thoriumivanduraniumivcomplexeswith26dipicolinoylbisiniinidiethylthiourealigands AT ulrichabram thoriumivanduraniumivcomplexeswith26dipicolinoylbisiniinidiethylthiourealigands |