A Ni(II) complex harnessed in a pentagonal bipyramidal environment by a rigid N₅-macrocyclic ligand (i.e. 1,3,10,12-tetramethyl-1,2,11,12-tetraaza[3](2,6)-pyridino[3](2,9)-1,10-phenanthrolinophane-2,10-diene) is shown to exhibit axial anisotropy with a ZFS D parameter in the order of −10 to −15 cm⁻¹, and this anisotropy is not significantly changed by apical ligand substitution. Using the latter complex as a building unit, a ferromagnetic 1-D CN-bridged Ni–Cr coordination polymer with SCM behavior characterized by a barrier of magnetization reversal U_eff/k_B = 54 K (37 cm⁻¹) with τ₀ = 2.28 × 10⁻¹¹ s was obtained. The Cr(III) complex involved in the design was chosen to favor parallel organization of the anisotropy axes of the Ni units along the 1-D array, and thus maximize the magnetic anisotropy of the supramolecular system. A related chain compound prepared with diamagnetic [Ni(CN)₄]²⁻ units, and a trinuclear CN-bridged [NiCr₂] complex enabled assessing respectively the magnetic anisotropy of Ni(II) in this coordination sphere and its exchange interaction with Cr(III) found to be ferromagnetic and of the order of 10 cm⁻¹. The crystal structures and magnetic behaviors of all compounds are reported.

中文翻译：

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基于五角双锥体构造单元的铁磁Ni（II）-Cr（III）单链磁体

一种Ni（II）络合物，通过刚性N _5-大环配体（即1,3,10,12-四甲基-1,2,11,12-四氮杂[3]（2,6）-吡啶并[3]（2,9）-1,10-菲咯啉烷-2,10-二烯）表现出ZFS D参数为-10到-15 cm ^-1的轴向各向异性，且该各向异性为顶端配体取代无明显变化。使用后者的复合物作为构建单元，具有SCM行为的铁磁一维CN桥连的Ni-Cr配位聚合物，其特征在于磁化反转势垒U _eff / k _B = 54 K（37 cm ^-1），τ_获得0＝ 2.28×10 ^-11 s。选择参与设计的Cr（ III）配合物，以促进Ni单元沿一维阵列的各向异性轴的平行组织，从而使超分子系统的磁各向异性最大化。用抗磁性[Ni（CN） ₄ ] ²⁻单元和三核CN桥联的[NiCr ₂ ]配合物制备的相关链状化合物能够分别评估该配位球中Ni（ II）的磁各向异性及其与Cr的交换相互作用（ III）被发现是铁磁性的，并且约为10cm ^-1。报告了所有化合物的晶体结构和磁行为。