Dynamic Magnetic Properties of Germole-ligated Lanthanide Sandwich Complexes

Dynamic Magnetic Properties of Germole-ligated Lanthanide Sandwich Complexes
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DOI:
10.1002/chem.202300567
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发表时间:
2023-05-11
影响因子:
4.3
通讯作者:
Layfield, Richard A.
Layfield, Richard A.
中科院分区:
化学2区
文献类型:
--
作者:
De, Siddhartha;Mondal, Arpan;Layfield, Richard A.

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报道了第一个生殖分子连接的单分子磁体,发现近线性夹心复合物 [(eta(8)-COT)Ln(eta(5)-Cp-Ge](-) 具有对比特性,其中 Ln=Dy (1(Dy)) 或 Er (1(Er)),COT 是环辛四烯基,Cp-Ge 是[GeC4-2,5-(SiMe3)(2)-3,4-Me-2](2-) 在零外加场和高达 10 K 的开磁滞回线中具有 120(1) cm(-1) 的能垒,而 1(Dy) 的弛豫特征在于基态内的量子隧道效应。
The first germole-ligated single-molecule magnets are reported, with contrasting properties found for the near-linear sandwich complexes [(eta(8)-COT)Ln(eta(5)-Cp-Ge](-), where Ln=Dy (1(Dy)) or Er (1(Er)), COT is cyclo-octatetraenyl and Cp-Ge is [GeC4-2,5-(SiMe3)(2)-3,4-Me-2](2-). Whereas 1(Er) has an energy barrier of 120(1) cm(-1) in zero applied field and open hysteresis loops up to 10 K, the relaxation in 1(Dy) is characterized by quantum tunneling within the ground state.