Slow relaxation of magnetization has been studied for a series of stable isomorphic 3D‐polynuclear Ln‐Co complexes comprising hexadentate [Co(CN)₆]^3– linkers, namely {[Ln(H₂O)₂][Co(CN)₆]·2H₂O}_n where Ln = Tb (1), Dy (2), Er (3) and Yb (4). While 1 and 4 behave as field‐induced single‐ion magnets (SIMs), compounds 2 and 3 undergo rapid demagnetization even under magnetic fields up to 5000 Oe. The effective anisotropic energy barrier of 4 was estimated as 63 K (5000 Oe) which, to the best of our knowledge, is the highest value among Yb‐based SIMs. The obtained data are discussed in scope of the configuration of the Ln environment, i.e. accounting its composition and geometry as well as mutual arrangement of chemically unequal donating centers. Thus, the studied series of complexes represents very rare case when SIM performance of non‐dysprosium complexes far surpasses that of isomorphic Dy derivative.

中文翻译：

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一系列同构镧系氰钴酸盐（III）配合物中非D单离子磁体的意外优势

研究了一系列稳定的同构3D-多核Ln-Co配合物的磁化慢弛豫，这些配合物包含六齿[Co（CN）₆ ] ^3–接头，即{[Ln（H ₂ O）₂ ] [Co（CN）₆ ] · 2H ₂ O} _n，其中Ln = Tb（1），Dy（2），Er（3）和Yb（4）。而1个4表现为电场感应单离子磁体（SIMS），化合物2和3即使在高达5000 Oe的磁场下也会经历快速退磁。据我们所知，有效的各向异性能垒4为63 K（5000 Oe），是基于Yb的SIM中的最高值。在Ln环境的配置范围内讨论了获得的数据，即考虑了其组成和几何形状以及化学不相等的捐赠中心的相互安排。因此，当非dy配合物的SIM性能远远超过同构Dy衍生物时，所研究的一系列配合物代表了非常罕见的情况。