Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide Biradical
The reaction of nitronyl nitroxide biradical NITPhMeImbis(5-(2-methylimidazole)-1,3-bis(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1<i>H</i>-imidazol-2-yl)-benzene) with Dy(hfac)<sub>3</sub> and La(hfac)<sub>3</sub> (hfac = hexafluoroacetylacetonate) affor...
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MDPI AG
2025-03-01
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| author | Yan Zhou Junfang Xie Chaoyi Jin Yue Ma Licun Li |
| author_facet | Yan Zhou Junfang Xie Chaoyi Jin Yue Ma Licun Li |
| author_sort | Yan Zhou |
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| description | The reaction of nitronyl nitroxide biradical NITPhMeImbis(5-(2-methylimidazole)-1,3-bis(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1<i>H</i>-imidazol-2-yl)-benzene) with Dy(hfac)<sub>3</sub> and La(hfac)<sub>3</sub> (hfac = hexafluoroacetylacetonate) afforded a heterolanthanide complex [Dy<sub>0.56</sub>La<sub>1.44</sub>(hfac)<sub>7</sub>(NITPhMeImbisH)] (<b>1</b>). In this complex, the biradical NITPhMeImbis ligand chelates one Ln(III) ion via its two neighboring NO units and simultaneously binds the La(III) ion through another NO group to form a dinuclear structure. Direct current (dc) magnetic measurement shows the dominant ferromagnetic couplings in Complex <b>1</b>. Spin dynamics studies exhibit visible frequency-dependent peaks of <i>χ</i>″ signals under a dc field evidenced by field-induced magnetic relaxation behavior, which is a combination of Orbach and QTM processes, giving the <i>U</i><sub>eff</sub>, <i>τ</i><sub>0</sub> and <i>τ</i><sub>QTM</sub> values of 15.14 K, 3.04 × 10<sup>−7</sup> s and 3.61 × 10<sup>−4</sup> s, respectively. |
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| issn | 2312-7481 |
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| publishDate | 2025-03-01 |
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| series | Magnetochemistry |
| spelling | doaj-art-6187eacb781b4f0ca80ea41e73b0f83c2025-08-20T02:18:09ZengMDPI AGMagnetochemistry2312-74812025-03-011142610.3390/magnetochemistry11040026Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide BiradicalYan Zhou0Junfang Xie1Chaoyi Jin2Yue Ma3Licun Li4Department of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaDepartment of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaDepartment of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaDepartment of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaDepartment of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry, College of Chemistry, Nankai University, Tianjin 300071, ChinaThe reaction of nitronyl nitroxide biradical NITPhMeImbis(5-(2-methylimidazole)-1,3-bis(1′-oxyl-3′-oxido-4′,4′,5′,5′-tetramethyl-4,5-hydro-1<i>H</i>-imidazol-2-yl)-benzene) with Dy(hfac)<sub>3</sub> and La(hfac)<sub>3</sub> (hfac = hexafluoroacetylacetonate) afforded a heterolanthanide complex [Dy<sub>0.56</sub>La<sub>1.44</sub>(hfac)<sub>7</sub>(NITPhMeImbisH)] (<b>1</b>). In this complex, the biradical NITPhMeImbis ligand chelates one Ln(III) ion via its two neighboring NO units and simultaneously binds the La(III) ion through another NO group to form a dinuclear structure. Direct current (dc) magnetic measurement shows the dominant ferromagnetic couplings in Complex <b>1</b>. Spin dynamics studies exhibit visible frequency-dependent peaks of <i>χ</i>″ signals under a dc field evidenced by field-induced magnetic relaxation behavior, which is a combination of Orbach and QTM processes, giving the <i>U</i><sub>eff</sub>, <i>τ</i><sub>0</sub> and <i>τ</i><sub>QTM</sub> values of 15.14 K, 3.04 × 10<sup>−7</sup> s and 3.61 × 10<sup>−4</sup> s, respectively.https://www.mdpi.com/2312-7481/11/4/26nitronyl nitroxide biradicalheterolanthanidecrystal structuremagnetic relaxation |
| spellingShingle | Yan Zhou Junfang Xie Chaoyi Jin Yue Ma Licun Li Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide Biradical Magnetochemistry nitronyl nitroxide biradical heterolanthanide crystal structure magnetic relaxation |
| title | Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide Biradical |
| title_full | Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide Biradical |
| title_fullStr | Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide Biradical |
| title_full_unstemmed | Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide Biradical |
| title_short | Magnetic Relaxation in a Heterolanthanide Binuclear Complex Involving a Nitronyl Nitroxide Biradical |
| title_sort | magnetic relaxation in a heterolanthanide binuclear complex involving a nitronyl nitroxide biradical |
| topic | nitronyl nitroxide biradical heterolanthanide crystal structure magnetic relaxation |
| url | https://www.mdpi.com/2312-7481/11/4/26 |
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