crystallographic C3 axis. The high-spin states (S = 5/2) of the individual iron(III) ions were determined by Mößbauer spectroscopy and confirmed by CASSCF/CASPT2 ab initio calculations. Magnetic measurements show an antiferromagnetic exchange between the iron(III) ions leading to a geometrically spin-frustrated ground state. This was complemented by high-field magnetization experiments up to 60 T, which confirm
三核高自旋
铁 (III) 络合物 [Fe 3 Cl 3 (saltag Br )(py) 6 ]ClO 4 H 5 saltag Br = 1,2,3-tris[(5-bromo-salicylidene)amino]guanidine } 是通过几种实验和理论方法合成和表征的。
铁 (III) 配合物表现出由刚性
配体主链强加的分子三重对称性,并在三角空间群P 3̅ 中结晶,配合物阳离子位于晶体C 3轴上。高自旋状态 ( S = 5 / 2) 的单个
铁 (III) 离子由 Mößbauer 光谱确定,并由 CASSCF/CA
SPT2 从头计算确认。磁性测量显示
铁 (III) 离子之间的反
铁磁交换导致几何自旋受抑基态。这是由高达 60 T 的高场磁化实验补充的,这证实了磁交换的各向同性和
铁 (III) 离子的单离子各向异性可忽略不计。进行了 Muon 自旋弛豫实验,进一步证明了耦合自旋基态的各向同性性质以及低至