具有融合五边形对和可变Dy-(μ-O)-Dy角的氧化物团簇富勒烯DyO@C和DyO@C中高达14 K的形状自适应单分子磁性和磁滞现象。
Shape-adaptive single-molecule magnetism and hysteresis up to 14 K in oxide clusterfullerenes DyO@C and DyO@C with fused pentagon pairs and flexible Dy-(μ-O)-Dy angle.
作者信息
Velkos Georgios, Yang Wei, Yao Yang-Rong, Sudarkova Svetlana M, Liu XinYe, Büchner Bernd, Avdoshenko Stanislav M, Chen Ning, Popov Alexey A
机构信息
Leibniz Institute for Solid State and Materials Research Helmholtzstraße 20, 01069 Dresden, Germany.
College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu 215123, P.R. China.
出版信息
Chem Sci. 2020 May 14;11(18):4766-4772. doi: 10.1039/D0SC00624F. Epub 2020 Apr 20.
Dysprosium oxide clusterfullerenes DyO@C(10528)-C and DyO@C(13333)-C are synthesized and characterized by single-crystal X-ray diffraction. Carbon cages of both molecules feature two adjacent pentagon pairs. These pentalene units determine positions of endohedral Dy ions hence the shape of the DyO cluster, which is bent in DyO@C but linear in DyO@C. Both compounds show slow relaxation of magnetization and magnetic hysteresis. Nearly complete cancelation of ferromagnetic dipolar and antiferromagnetic exchange Dy…Dy interactions leads to unusual magnetic properties. DyO@C exhibits zero-field quantum tunneling of magnetization and magnetic hysteresis up to 14 K, the highest temperature among Dy-clusterfullerenes.
合成了氧化镝团簇富勒烯DyO@C(10528)-C和DyO@C(13333)-C，并通过单晶X射线衍射对其进行了表征。这两种分子的碳笼均具有两个相邻的五边形对。这些并五苯单元决定了内包Dy离子的位置，从而决定了DyO团簇的形状，DyO@C中的DyO团簇是弯曲的，而DyO@C(13333)-C中的DyO团簇是线性的。这两种化合物都表现出磁化强度的缓慢弛豫和磁滞现象。铁磁偶极和反铁磁交换Dy…Dy相互作用几乎完全抵消，导致了不寻常的磁性。DyO@C表现出磁化强度的零场量子隧穿和高达14 K的磁滞现象，这是Dy团簇富勒烯中最高的温度。
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