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Rare-Earth Cyclobutadienyl Sandwich Complexes: Synthesis, Structure and Dynamic Magnetic Properties.
- Source :
-
Chemistry (Weinheim an der Bergstrasse, Germany) [Chemistry] 2018 Nov 13; Vol. 24 (63), pp. 16779-16782. Date of Electronic Publication: 2018 Oct 30. - Publication Year :
- 2018
-
Abstract
- The potassium cyclobutadienyl [K <subscript>2</subscript> {η <superscript>4</superscript> -C <subscript>4</subscript> (SiMe <subscript>3</subscript> ) <subscript>4</subscript> }] (1) reacts with MCl <subscript>3</subscript> (THF) <subscript>3.5</subscript> (M=Y, Dy) to give the first rare-earth cyclobutadienyl complexes, that is, the complex anions [M{η <superscript>4</superscript> -C <subscript>4</subscript> (SiMe <subscript>3</subscript> ) <subscript>4</subscript> }{η <superscript>4</superscript> -C <subscript>4</subscript> (SiMe <subscript>3</subscript> ) <subscript>3</subscript> -κ-(CH <subscript>2</subscript> SiMe <subscript>2</subscript> }] <superscript>2-</superscript> , (2 <subscript>M</subscript> ), as their dipotassium salts. The tuck-in alkyl ligand in 2 <subscript>M</subscript> is thought to form through deprotonation of the "squarocene" complexes [M{η <superscript>4</superscript> -C <subscript>4</subscript> (SiMe <subscript>3</subscript> ) <subscript>4</subscript> } <subscript>2</subscript> ] <superscript>-</superscript> by 1. Complex 2 <subscript>Dy</subscript> is a single-molecule magnet, but with prominent quantum tunneling. An anisotropy barrier of 323(22) cm <superscript>-1</superscript> was determined for 2 <subscript>Dy</subscript> in an applied field of 1 kOe, and magnetic hysteresis loops were observed up to 7 K.<br /> (© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Details
- Language :
- English
- ISSN :
- 1521-3765
- Volume :
- 24
- Issue :
- 63
- Database :
- MEDLINE
- Journal :
- Chemistry (Weinheim an der Bergstrasse, Germany)
- Publication Type :
- Academic Journal
- Accession number :
- 30230639
- Full Text :
- https://doi.org/10.1002/chem.201804776