Magnetic relaxation in mononuclear Tb and Dy complexes involving chelate nitronyl nitroxide ligand
| Autor: | Li-Li Zhu, Jiang-Fei Cao, Yan-Hua Zhao, Chao Wang, Yan Su, Yi-Xuan Zhu, Yan-Ni Wu, Peng Hu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Nitroxide mediated radical polymerization
010405 organic chemistry Ligand 010402 general chemistry Ring (chemistry) 01 natural sciences 0104 chemical sciences Ion Inorganic Chemistry chemistry.chemical_compound Crystallography chemistry Ferromagnetism Materials Chemistry Chelation Physical and Theoretical Chemistry Thiazole Single crystal |
| Zdroj: | Polyhedron. 155:375-381 |
| ISSN: | 0277-5387 |
| DOI: | 10.1016/j.poly.2018.08.058 |
| Popis: | Three new lanthanide-nitronyl nitroxide radical complexes [Ln(tfac)3(NIT-2thz)] (Ln(III) = Gd 1, Tb 2, Dy 3; tfac = trifluoroacetylacetonate; NIT-2thz = 2-(2′-thiazolyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) have been synthesized. Single crystal X-ray diffraction analyses reveal that complexes 1–3 are isomorphous. They all crystallized in the C2/c space groups. Each central Ln(III) ion is eight-coordinated by three bischelate tfac ligands and one radical ligand. More specifically, NIT-2thz acts as a chelate ligand to link one Ln(III) ion through its nitrogen atom of the thiazole ring and oxygen atom of the N–O group to form a two-spin system. Magnetic studies show that Gd complex exhibits ferromagnetic Gd(III)–radical coupling, Tb and Dy complexes exhibit frequency-dependent out-of-phase signals. |
| Databáze: | OpenAIRE |
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