INTRAMOLECULAR ANTIFERROMAGNETIC COUPLING IN SUPRAMOLECULAR GRID STRUCTURES WITH CO2+ METAL CENTERS
INTRAMOLECULAR ANTIFERROMAGNETIC COUPLING IN SUPRAMOLECULAR GRID STRUCTURES WITH CO2+ METAL CENTERS
复制标题
具有 CO2 金属中心的超分子网格结构中的分子内反铁磁耦合
DOI：
10.1103/physrevlett.78.3390
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发表时间：
1997
影响因子：
8.6
通讯作者：
J. Lehn
中科院分区：
文献类型：
--
作者：
O. Waldmann;J. Hassmann;P. Müller;G. Hanan;D. Volkmer;U. Schubert;J. Lehn
测量了由四个双（联吡啶基）嘧啶配体和四个 Co21 离子组成的新型超分子网格结构的磁化强度。我们提供了 Co21 自旋反铁磁耦合的证据。对平均网格距离为 20 至 160 Å 的微晶、粉末和溶液的研究表明，耦合完全是分子内起源的，不受长程有序的影响。因此，这些网格形成了几乎理想的四个自旋的量子自旋系统。低温现场扫描测量进一步支持了这一点。 [S0031-9007(97)03039-1]
The magnetization of novel supramolecular grid structures consisting of four bis(bipyridyl)pyrimidine ligands and four Co21 ions was measured. We provide evidence for an antiferromagnetic coupling of the Co21 spins. Investigations of microcrystals, powders, and solutions with the mean distance of the grids varying from 20 to 160 Å showed that the coupling is solely of intramolecular origin and is not affected by long-range ordering. Thus, these grids form an almos ideal quantum spin system of four spins. This is further supported by low-temperature field-swee measurements. [S0031-9007(97)03039-1]