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

Layfield, Richard, Day, Benjamin, Guo, Fu-Sheng, Giblin, Sean ORCID: https://orcid.org/0000-0003-1876-8619, 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:	05 May 2023 01:58
URI:	https://orca.cardiff.ac.uk/id/eprint/115334

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