Department of Chemistry, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1.
J Am Chem Soc. 2011 Jun 1;133(21):8126-9. doi: 10.1021/ja202156u. Epub 2011 May 9.
High-field, single-crystal EPR spectroscopy on a tetragonal bisdiselenazolyl ferromagnet has provided evidence for the presence of easy-axis magnetic anisotropy, with the crystallographic c axis as the easy axis and the ab plane as the hard plane. The observation of a zero-field gap in the resonance frequency is interpreted in terms of an anisotropy field several orders of magnitude larger than that observed in light-heteroatom, nonmetallic ferromagnets and comparable (on a per-site basis) to that observed in hexagonal close packed cobalt. The results indicate that large spin-orbit-induced magnetic anisotropies, typically associated with 3d-orbital-based ferromagnets, can also be found in heavy p-block radicals, suggesting that there may be major opportunities for the development of heavy p-block organic magnetic materials.
四方双硒唑基亚铁磁体的高场单晶电子顺磁共振光谱为易轴各向异性的存在提供了证据，其中晶体学的 c 轴为易轴，ab 面为难轴。在共振频率中观察到零场间隙，这一现象可通过各向异性场来解释，该场的量级远大于在轻杂原子、非金属铁磁体中观察到的场，并且与六方密堆积钴的场相当（基于每个位置）。结果表明，大的自旋轨道诱导各向异性通常与 3d 轨道基铁磁体有关，也可以在重 p 区自由基中找到，这表明可能有很大的机会开发重 p 区有机磁性材料。
