Family of Quasi-Isotropic $Mn^{II}$ and ${Mn_2}^{II}$ Complexes Exhibiting Slow Relaxation of the Magnetization
Slow relaxation of magnetization has been studied for a family of mononuclear MnII complexes and one ferromagnetic dinuclear system, all of them presenting very weak anisotropy. Complexes with formula $[\{NiL1Mn-(H_{2}O)_{2}(MeOH)\}\{NiL1\}_{2}](ClO_{4})_{2}$ (1), [Mn{NiL1}2](ClO4)2 (2), $[Mn\{NiL2\...
| Autores: | , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repositorio: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:dnet:recercat____::d61e5e03c597b969c47eb54d9384f463 |
| Acceso en línea: | https://hdl.handle.net/2445/229238 |
| Access Level: | acceso abierto |
| Palabra clave: | Magnetisme Complexos metàl·lics Metalls de transició Magnetism Metal complexes Transition metals |
| Sumario: | Slow relaxation of magnetization has been studied for a family of mononuclear MnII complexes and one ferromagnetic dinuclear system, all of them presenting very weak anisotropy. Complexes with formula $[\{NiL1Mn-(H_{2}O)_{2}(MeOH)\}\{NiL1\}_{2}](ClO_{4})_{2}$ (1), [Mn{NiL1}2](ClO4)2 (2), $[Mn\{NiL2\}_{2}](ClO_{4})_{2}(RR-L2^{2-}, 3RR, SS-L2^{2-}, 3SS)$, $[Mn\{NiL3\}_{2}](ClO_{4})_{2}(RR-L3^{2-}, 4RR, SS-L3^{2-}, 4SS)$ and $(\mu_{1,1}-N_{3})_{2}[Ni_{2}Mn_{2}(L1)_{2}(N_{3})_{2}]$ (5) are derived from compart- mental Schiff bases, in which the NiII environment is square planar and thus diamagnetic. All of the systems have been structurally and magnetically characterized. Zero field splitting (D) values for the MnII cations have been obtained from EPR spectroscopy and NEVPT2 calculations. The slow relaxation of the magnetization for 1−5 has been studied by means of ac magnetometry and rationalized on the basis of their low, but not zero, anisotropy, providing the first example of a polynuclear MnII complex, with S = 5 ground state, exhibiting slow relaxation. |
|---|