Radical bridged Ln₄ metallocene complexes with strong magnetic coupling and large coercive field
Mavragani, Niki; Errulat, Dylan; Gálico, Diogo A.; Kitos, Alexandros A.; Mansikkamäki, Akseli; Murugesu, Muralee (2021-08-24)
N. Mavragani, D. Errulat, D. A. Gálico, A. A. Kitos, A. Mansikkamäki, M. Murugesu, Angew. Chem. Int. Ed. 2021, 60, 24206. https://doi.org/10.1002/anie.202110813
© 2021 Wiley-VCH GmbH. This is the peer reviewed version of the following article: N. Mavragani, D. Errulat, D. A. Gálico, A. A. Kitos, A. Mansikkamäki, M. Murugesu, Angew. Chem. Int. Ed. 2021, 60, 24206, which has been published in final form at https://doi.org/10.1002/anie.202110813. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
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https://urn.fi/URN:NBN:fi-fe2022012710486
Tiivistelmä
Abstract
Inducing magnetic coupling between 4f elements is an ongoing challenge. To overcome this formidable difficulty, we incorporate highly delocalized tetrazinyl radicals, which strongly couple with f-block metallocenes to form discrete tetranuclear complexes. Synthesis, structure, magnetic properties of two tetranuclear [(Cp*₂Ln)₄(tz•)₄]·3(C₆H₆) (Cp* = pentamethylcyclopentadienyl; tz = 1,2,4,5-tetrazine; Ln = Dy, Gd) complexes are reported. An in-depth examination of their magnetic properties through magnetic susceptibility measurements, as well as computational studies, support a highly sought-after radical-induced “giant-spin” model. Strong exchange interactions between the LnIII ions and tz• radicals lead to a strong magnet-like behaviour in this molecular magnet with a giant coercive field of 30 kOe.
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