具有创纪录各向异性势垒的杂化 Fe(II)-Dy(III) 单分子磁体。
A heterometallic Fe(II)-Dy(III) single-molecule magnet with a record anisotropy barrier.
机构信息
Key Laboratory of Bioinorganic and Synthetic Chemistry of the Ministry of Education, State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275 (P. R. China) http://ce.sysu.edu.cn/bisc/members/200809/6440.html.
出版信息
Angew Chem Int Ed Engl. 2014 Nov 17;53(47):12966-70. doi: 10.1002/anie.201407799. Epub 2014 Sep 24.
A record anisotropy barrier (319 cm(-1) ) for all d-f complexes was observed for a unique Fe(II) -Dy(III) -Fe(II) single-molecule magnet (SMM), which possesses two asymmetric and distorted Fe(II) ions and one quasi-D5h Dy(III) ion. The frozen magnetization of the Dy(III) ion leads to the decreased Fe(II) relaxation rates evident in the Mössbauer spectrum. Ab initio calculations suggest that tunneling is interrupted effectively thanks to the exchange doublets.
观测到一个独特的 Fe(II)-Dy(III)-Fe(II) 单分子磁体（SMM）具有各向异性壁垒（319cm(-1)），该 SMM 具有两个不对称且变形的 Fe(II) 离子和一个准 D5h Dy(III) 离子。Dy(III) 离子的冻结磁矩导致 Mössbauer 光谱中 Fe(II) 弛豫率降低。从头算计算表明，由于交换双态，隧道有效地中断。
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