Studies on the Magnetic Ground State of a Spin Möbius Strip.
Studies on the Magnetic Ground State of a Spin Möbius Strip.
复制标题
自旋莫比乌斯带磁基态的研究。
作者：
Graham N. Newton;Norihisa Hoshino;Takuto Matsumoto;Takuya Shiga;M. Nakano;H. Nojiri;W. Wernsdorfer;Y. Furukawa;H. Oshio
本文报道了由（V=O）SO4·x H2 O与α、β或γ-环糊精（CDs）和NaOH在水中反应制备的三个n元氧化钒环Nan [(V=O)n Nan (H2 O)n (α， β或γ-CD)2]·m H2 O （n=6, 7或8）的合成、结构和详细表征。它们交替的异金属钒/钠环核结构夹在两个CD基团之间，使得O-Na-O基团将相邻的钒基离子分开。S=1/2钒基离子之间的反铁磁相互作用导致偶数元环的基态为S=0，而自旋受挫的七核团簇的基态为两个拟简并S=1/2。
Here we report the synthesis, structure and detailed characterisation of three n-membered oxovanadium rings, Nan [(V=O)n Nan (H2 O)n (α, β, or γ-CD)2 ]⋅m H2 O (n=6, 7, or 8), prepared by the reactions of (V=O)SO4 ⋅x H2 O with α, β, or γ-cyclodextrins (CDs) and NaOH in water. Their alternating heterometallic vanadium/sodium cyclic core structures were sandwiched between two CD moieties such that O-Na-O groups separated the neighbouring vanadyl ions. Antiferromagnetic interactions between the S=1/2 vanadyl ions led to S=0 ground states for the even-membered rings, but to two quasi-degenerate S=1/2 states for the spin-frustrated heptanuclear cluster.