Rare-Earth Cyclobutadienyl Sandwich Complexes : Synthesis, Structure and Dynamic Magnetic Properties
Day, B., Guo, F.-S., Giblin, S., Sekiguchi, A., Mansikkamäki, A., & Layfield, R. (2018). Rare-Earth Cyclobutadienyl Sandwich Complexes : Synthesis, Structure and Dynamic Magnetic Properties. Chemistry : A European Journal, 24(63), 16779-16782. https://doi.org/10.1002/chem.201804776
Julkaistu sarjassa
Chemistry : A European JournalPäivämäärä
2018Oppiaine
Epäorgaaninen ja analyyttinen kemiaNanoscience CenterInorganic and Analytical ChemistryNanoscience CenterTekijänoikeudet
© 2018 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim.
The potassium cyclobutadienyl [K2{η4‐C4(SiMe3)4}] (1) reacts with MCl3(THF)3.5 (M=Y, Dy) to give the first rare‐earth cyclobutadienyl complexes, that is, the complex anions [M{η4‐C4(SiMe3)4}{η4‐C4(SiMe3)3‐κ‐(CH2SiMe2}]2−, (2M), as their dipotassium salts. The tuck‐in alkyl ligand in 2M is thought to form through deprotonation of the “squarocene” complexes [M{η4‐C4(SiMe3)4}2]− by 1. Complex 2Dy is a single‐molecule magnet, but with prominent quantum tunneling. An anisotropy barrier of 323(22) cm−1 was determined for 2Dy in an applied field of 1 kOe, and magnetic hysteresis loops were observed up to 7 K.
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https://converis.jyu.fi/converis/portal/detail/Publication/28281258
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B.M.D., F.S.G. and R.A.L. thank the European Research Council (CoG grant 646740) and the EPSRC (EP/M022064/1) for financial support. A.M. acknowledges the Academy of Finland (project No. 289172) and Prof. H. M. Tuononen (University of Jyväskylä) for provision of computational resources. We thank Prof. R. N. Nair and Dr A. Achari (Manchester) for assistance with some of the D.C. magnetic susceptib ...
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