The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) Complexes
Three Eu<sup>3+</sup> complexes containing a neutral tripodal ligand possessing a predictable coordination mode have been obtained and studied. The trispyrazolylmethane complexes have an aqua ligand in the coordination sphere, forming both the mononuclear species [Eu(HCPz<sub>3<...
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MDPI AG
2023-10-01
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| Series: | Inorganics |
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| Online Access: | https://www.mdpi.com/2304-6740/11/10/418 |
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| author | Kira E. Vostrikova Taisiya S. Sukhikh Alexander N. Lavrov |
| author_facet | Kira E. Vostrikova Taisiya S. Sukhikh Alexander N. Lavrov |
| author_sort | Kira E. Vostrikova |
| collection | DOAJ |
| description | Three Eu<sup>3+</sup> complexes containing a neutral tripodal ligand possessing a predictable coordination mode have been obtained and studied. The trispyrazolylmethane complexes have an aqua ligand in the coordination sphere, forming both the mononuclear species [Eu(HCPz<sub>3</sub>)H<sub>2</sub>O(NO<sub>3</sub>)<sub>3</sub>] and the dimer [Eu(HCPz<sub>3</sub>)H<sub>2</sub>O(CF<sub>3</sub>SO<sub>3</sub>)<sub>3</sub>]<sub>2</sub>, having a <i>Chinese lantern</i> structure, whereas the use of the methylated tripod leads to the water-free complex, [Eu(HC(Pz<sup>Me</sup><sub>2</sub>)<sub>3</sub>)(NO<sub>3</sub>)<sub>3</sub>]. A qualitative analysis of the magnetic susceptibility of polycrystalline samples demonstrated that the magnetic properties can be described using a simple Van Vleck formula with spin–orbit coupling parameter (<i>λ</i> = 383 ÷ 406 cm<sup>−1</sup>) close to the values for free Eu<sup>3+</sup> ions. The stereochemical analysis of the coordination environment of [Ln(HC(Pz<sup>Me</sup><sub>2</sub>)<sub>3</sub>)(NO<sub>3</sub>)<sub>3</sub>] has shown that these complexes can be used as diamagnetic model systems to obtain information on the crystal field effects in the paramagnetic monoradical complexes, [LnRad(NO<sub>3</sub>)<sub>3</sub>], since both types of compounds have the same type of coordination polyhedron (symmetry point group <i>D<sub>3h</sub></i>) and very close Ln–donor atom distances. |
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| language | English |
| last_indexed | 2024-03-10T21:11:11Z |
| publishDate | 2023-10-01 |
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| record_format | Article |
| series | Inorganics |
| spelling | doaj.art-d1ebc37342654e6fa706eb12a9fe166c2023-11-19T16:49:24ZengMDPI AGInorganics2304-67402023-10-01111041810.3390/inorganics11100418The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) ComplexesKira E. Vostrikova0Taisiya S. Sukhikh1Alexander N. Lavrov2Nikolayev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, RussiaNikolayev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, RussiaNikolayev Institute of Inorganic Chemistry, Siberian Branch of Russian Academy of Sciences, 630090 Novosibirsk, RussiaThree Eu<sup>3+</sup> complexes containing a neutral tripodal ligand possessing a predictable coordination mode have been obtained and studied. The trispyrazolylmethane complexes have an aqua ligand in the coordination sphere, forming both the mononuclear species [Eu(HCPz<sub>3</sub>)H<sub>2</sub>O(NO<sub>3</sub>)<sub>3</sub>] and the dimer [Eu(HCPz<sub>3</sub>)H<sub>2</sub>O(CF<sub>3</sub>SO<sub>3</sub>)<sub>3</sub>]<sub>2</sub>, having a <i>Chinese lantern</i> structure, whereas the use of the methylated tripod leads to the water-free complex, [Eu(HC(Pz<sup>Me</sup><sub>2</sub>)<sub>3</sub>)(NO<sub>3</sub>)<sub>3</sub>]. A qualitative analysis of the magnetic susceptibility of polycrystalline samples demonstrated that the magnetic properties can be described using a simple Van Vleck formula with spin–orbit coupling parameter (<i>λ</i> = 383 ÷ 406 cm<sup>−1</sup>) close to the values for free Eu<sup>3+</sup> ions. The stereochemical analysis of the coordination environment of [Ln(HC(Pz<sup>Me</sup><sub>2</sub>)<sub>3</sub>)(NO<sub>3</sub>)<sub>3</sub>] has shown that these complexes can be used as diamagnetic model systems to obtain information on the crystal field effects in the paramagnetic monoradical complexes, [LnRad(NO<sub>3</sub>)<sub>3</sub>], since both types of compounds have the same type of coordination polyhedron (symmetry point group <i>D<sub>3h</sub></i>) and very close Ln–donor atom distances.https://www.mdpi.com/2304-6740/11/10/418europium(III) complexesscorpionatetripodal ligandtrispyrazolylmethanetris(3,5-dimethyl-1-pyrazolyl)methanemagnetic properties |
| spellingShingle | Kira E. Vostrikova Taisiya S. Sukhikh Alexander N. Lavrov The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) Complexes Inorganics europium(III) complexes scorpionate tripodal ligand trispyrazolylmethane tris(3,5-dimethyl-1-pyrazolyl)methane magnetic properties |
| title | The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) Complexes |
| title_full | The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) Complexes |
| title_fullStr | The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) Complexes |
| title_full_unstemmed | The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) Complexes |
| title_short | The Synthesis, Crystal Structure, and Magnetic Properties of Mono-Scorpionate Eu(III) Complexes |
| title_sort | synthesis crystal structure and magnetic properties of mono scorpionate eu iii complexes |
| topic | europium(III) complexes scorpionate tripodal ligand trispyrazolylmethane tris(3,5-dimethyl-1-pyrazolyl)methane magnetic properties |
| url | https://www.mdpi.com/2304-6740/11/10/418 |
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