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From a Piano Stool to a Sandwich: A Stepwise Route for Improving the Slow Magnetic Relaxation Properties of Thulium
Organometallics ( IF 2.5 ) Pub Date : 2017-08-29 00:00:00 , DOI: 10.1021/acs.organomet.7b00449
Katie L. M. Harriman 1 , Ilia Korobkov 1 , Muralee Murugesu 1
Affiliation  

Two mononuclear TmIII complexes, [Tm(COT)I(THF)2] (1-Tm) and [K(18-crown-6)(THF)2][Tm(COT)2] (2-Tm), display slow relaxation of the magnetization, making these compounds rare examples of non-Kramers TmIII single-molecule magnets (SMMs). Utilizing a stepwise synthetic approach for the installation of cyclooctatetraenide (COT) ligands, we can observe the effect of symmetry optimization at the metal center. This method results in an 85% increase in the energy barrier to magnetization reversal (Ueff) for 2-Tm (Ueff = 53.3 K) over 1-Tm (Ueff = 7.93 K). The increased local symmetry of 2-Tm reduces the need for large static fields, eliciting SMM behavior under a small field of 200 Oe. This illustrates the power of fine-tuning the ligand environment to enhance the magnetic relaxation properties of non-Kramers ions.

中文翻译:

从钢琴凳到三明治:改善Th的慢磁弛豫特性的分步路线

两个单核Tm III配合物[Tm(COT)I(THF)2 ](1-Tm)和[K(18-crown-6)(THF)2 ] [Tm(COT)2 ](2-Tm),由于显示出缓慢的磁化弛豫,使得这些化合物成为非克拉默Tm III单分子磁体(SMM)的稀有例子。利用逐步合成方法安装环辛酸酯(COT)配体,我们可以在金属中心观察到对称优化的效果。此方法导致2-TmU eff = 53.3 K)超过1-Tm的磁化反转(U eff)的能垒提高了85%U eff = 7.93 K)。2-Tm的增加的局部对称性减少了对大静态场的需求,从而在200 Oe的小场下引发了SMM行为。这说明了微调配体环境以增强非克拉默斯离子的磁弛豫性能的能力。
更新日期:2017-08-30
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