Kaemmerer Hagen, Baniodeh Amer, Peng Yan, Moreno-Pineda Eufemio, Schulze Michael, Anson Christopher E, Wernsdorfer Wolfgang, Schnack Jürgen, Powell Annie K
Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstr. 15, 76131 Karlsruhe, Germany.
Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
J Am Chem Soc. 2020 Sep 2;142(35):14838-14842. doi: 10.1021/jacs.0c07168. Epub 2020 Aug 20.
Cyclic coordination clusters (CCCs) are proving to provide an extra dimension in terms of exotic magnetic behavior as a result of their finite but cyclized chain structures. The FeDy CCC is a Single Molecule Magnet with the highest nuclearity among Ln containing clusters. The three isostructural compounds FeLn(μ-OH)(ampd)(Hampd)(PhCO)·38MeCN for Ln = Dy (), Lu (), or Y (), where Hampd = 2-amino-2-methyl-1,3-propanediol, are reported. These can be described in terms of the cyclization of six {FeLn(μOH)(ampd)(Hampd)(PhCO)} units with six nitrate counterions to give the neutral cluster. The overall structure consists of two giant Dy triangles sandwiching a strongly antiferromagnetically coupled Fe ring, leading to a toroidal arrangement of the anisotropy axis of the Dy ions, making this the biggest toroidal arrangement on a molecular level known so far.
由于其有限但环化的链结构，循环配位簇（CCC）在奇异磁行为方面正展现出一个新的维度。FeDy CCC是含镧系元素簇中核数最高的单分子磁体。本文报道了三种同构化合物FeLn(μ-OH)(ampd)(Hampd)(PhCO)·38MeCN，其中Ln分别为Dy（）、Lu（）或Y（），Hampd = 2-氨基-2-甲基-1,3-丙二醇。这些化合物可描述为六个{FeLn(μOH)(ampd)(Hampd)(PhCO)}单元与六个硝酸根抗衡离子环化形成中性簇。整体结构由两个巨大的Dy三角形夹着一个强反铁磁耦合的Fe环组成，导致Dy离子的各向异性轴呈环形排列，这是迄今为止在分子水平上已知的最大环形排列。
