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Rare‐earth cyclobutadienyl sandwich complexes: Synthesis, structure and dynamic magnetic properties

Layfield, Richard, Day, Benjamin, Guo, Fu-Sheng, Giblin, Sean, Sekiguchi, Akira and Mansikkamaki, Akseli 2018. Rare‐earth cyclobutadienyl sandwich complexes: Synthesis, structure and dynamic magnetic properties. Chemistry - A European Journal 24 (63) , pp. 16779-16782. 10.1002/chem.201804776
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Abstract

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, i.e. 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 sandwich complexes [M{η4‐C4(SiMe3)4}2]– by 1. Complex 2Dy is a single‐molecule magnet, but with prominent quantum tunnelling. An anisotropy barrier of 323(22) cm–1 was determined for 2Dy in an applied field of 1 kOe, and S‐shaped magnetic hysteresis loops were observed up to 7 K.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Wiley
ISSN: 0947-6539
Date of First Compliant Deposit: 28 September 2018
Date of Acceptance: 19 September 2018
Last Modified: 10 Dec 2018 14:57
URI: http://orca.cf.ac.uk/id/eprint/115334

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