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Rare‐Earth Cyclobutadienyl Sandwich Complexes: Synthesis, Structure and Dynamic Magnetic Properties
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2018-10-30 , DOI: 10.1002/chem.201804776
Benjamin M. Day 1, 2 , Fu-Sheng Guo 1 , Sean R. Giblin 3 , Akira Sekiguchi 4 , Akseli Mansikkamäki 5 , Richard A. Layfield 1
Affiliation  

The potassium cyclobutadienyl [K24‐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.

中文翻译:

稀土环丁二烯三明治复合物:合成,结构和动态磁性能

钾cyclobutadienyl [K 24 -C 4(森达34 }](1)反应使用的MC1 3(THF)3.5(M = Y,DY),得到第1稀土类cyclobutadienyl络合物,即,该络合阴离子[M {η 4 -C 4(森达34 } {η 4 -C 4(森达33 -κ-(CH 2森达2 }] 2-,(2中号),因为它们的二钾盐。2 M中的折入烷基配体通过“squarocene”复合物的脱质子化认为形式[M {η 4 -C 4(森达34 } 2 ] -1。复合物2 Dy是单分子磁体,但是具有显着的量子隧穿。在1 kOe的外加磁场中,对于2 Dy确定了323(22)cm -1的各向异性势垒,并且观察到磁滞回线直至7K。
更新日期:2018-10-30
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