Attempting to understand (and control) the relationship between structure and magnetism in an extended family of Mn6 single-molecule magnets
作者:Ross Inglis、Leigh F. Jones、Constantinos J. Milios、Saiti Datta、Anna Collins、Simon Parsons、Wolfgang Wernsdorfer、Stephen Hill、Spyros P. Perlepes、Stergios Piligkos、Euan K. Brechin
DOI:10.1039/b822235e
日期:——
The synthesis and characterisation of a large family of hexametallic [MnIII6] Single-Molecule Magnets of general formula [MnIII6O2(R-sao)6(X)2(sol)4–6] (where R = H, Me, Et; X = −O2CR′ (R′ = H, Me, Ph etc) or Hal−; sol = EtOH, MeOH and/or H2O) are presented. We show how deliberate structural distortions of the [Mn3O] trinuclear moieties within the [Mn6] complexes are used to tune their magnetic properties. These findings highlight a qualitative magneto-structural correlation whereby the type (anti- or ferromagnetic) of each Mn2 pairwise magnetic exchange is dominated by the magnitude of each individual Mn-N-O-Mn torsion angle. The observation of magneto-structural correlations on such large polymetallic complexes is rare and represents one of the largest studies of this kind.
通式为 [MnIII6O2(R-sao)6(X)2(sol)4–6] 的一大类六金属 [MnIII6] 单分子磁体的合成和表征(其中 R = H、Me、Et;X = -O2CR′(R′ = H、Me、Ph 等)或 Hal−;sol = EtOH、MeOH 和/或 H2O)。我们展示了如何利用 [Mn6] 配合物中 [Mn3O] 三核部分的故意结构扭曲来调整其磁性。这些发现强调了定性的磁结构相关性,其中每个 Mn2 成对磁交换的类型(反磁或铁磁)由每个单独的 Mn-N-O-Mn 扭转角的大小决定。对如此大的多金属配合物的磁结构相关性的观察是罕见的,并且代表了此类最大的研究之一。