Department of Chemistry, University of Washington, WA 98195, USA.
Dalton Trans. 2012 Nov 28;41(44):13572-4. doi: 10.1039/c2dt31352a. Epub 2012 Aug 10.
Lanthanide- and actinide-based single-molecule magnets are rapidly gaining prominence due to the unique properties of f-orbitals, yet no direct comparison of slow magnetic relaxation of an isostructural and valence isoelectronic lanthanide and actinide complex exists. We present the dynamic magnetic properties of two f-element single-molecule magnets, NdTp(3) and UTp(3) (Tp(-) = trispyrazolylborate), demonstrating that, although neither complex displays the full anisotropy barrier predicted from its electronic structure, relaxation is slower in the uranium congener. Magnetic dilution studies performed with NdTp(3) reveal that, while intermolecular interactions partially account for the faster relaxation dynamics, they are not uniquely responsible.
基于镧系和锕系元素的单分子磁体由于其 f 轨道的独特性质而迅速受到关注，但尚未有同构和价电子等电子的镧系和锕系元素配合物的慢磁弛豫的直接比较。我们展示了两种 f 族元素单分子磁体 NdTp(3) 和 UTp(3)（Tp(-) = 三吡唑基硼酸盐）的动态磁性质，表明尽管这两个配合物都没有显示出其电子结构所预测的完整各向异性势垒，但铀同系物的弛豫更慢。对 NdTp(3) 进行的磁稀释研究表明，尽管分子间相互作用部分解释了更快的弛豫动力学，但它们并不是唯一的原因。
