Two heads are better than one : improving magnetic relaxation in the dysprosium metallocene DyCp*₂BPh₄ upon dimerization by use of an exceptionally weakly-coordinating anion
Errulat, Dylan; Gabidullin, Bulat; Mansikkamäki, Akseli; Murugesu, Muralee (2020-04-16)
Errulat, D., Gabidullin, B., Mansikkamäki, A., Murugesu, M. (2020) Two heads are better than one : improving magnetic relaxation in the dysprosium metallocene DyCp*₂BPh₄ upon dimerization by use of an exceptionally weakly-coordinating anion. Chemical Communications,56 (44), 5937-5940. https://doi.org/10.1039/D0CC01980A
© 2020 The Authors. Publishing rights The Royal Society of Chemistry.
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https://urn.fi/URN:NBN:fi-fe2020060440638
Tiivistelmä
Abstract
Partial metathesis between two weakly-coordinating anions in the archetypical dysprosium metallocene DyCp*₂BPh₄ results in the first example of [BPh₄]⁻ as a bridging ligand in 4f metals, with a unique η₂,η₂:η₂,η₂-bridge. Magnetic susceptibility and relaxation dynamics studies along with ab initio calculations reveal improved slow relaxation of the magnetization in [Dy₂Cp*₄(μ-BPh₄)][Al(OC(CF₃)₃)₄] over its mononuclear congener, resulting in an energy barrier of 490 K/340 cm⁻¹ and waist-restricted hysteresis up to 6.5 K.
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