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Magnetization slow dynamics in ferrocenium complexes
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The Single-Molecule Magnet (SMM) properties of a series of ferrocenium complexes, [Fe(5-C5R5)2]+ (R = Me, Bn), are reported. In the presence of an applied dc field, the slow dynamics of the magnetization in [Fe(5-C5Me5)2]BArF are revealed. Multireference quantum mechanical calculations show a large energy difference between the ground and first excited states, excluding the commonly invoked, thermally activated (Orbach-like) mechanism of relaxation. In contrast, a detailed analysis of the relaxation time highlights that both direct and Raman processes are responsible for the SMM properties. Similarly, the bulky ferrocenium complexes, [Fe(5-C5Bn5)2]BF4 and [Fe(5-C5Bn5)2]PF6, also exhibit magnetization slow dynamics, however an additional relaxation process is clearly detected for these analogous systems.
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DING, Mei, et al. Magnetization slow dynamics in ferrocenium complexes. Chemistry-A European Journal. 2019. Vol. 25, núm. 45, pàgs. 10625-10632. ISSN 0947-6539. [consulta: 7 de maig de 2026]. Disponible a: https://hdl.handle.net/2445/155528