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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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
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| Series: | Magnetochemistry |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2312-7481/11/4/26 |
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| Summary: | 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 |