A new tert‐buthylthiacalix[4]arene‐based tetranuclear 3d‐4f metal complex with the Mn₂Tb₂ core has been synthesized and its molecular and crystal structures have been studied by X‐ray diffraction. The complex geometry is similar to that of the earlier synthesized tert‐buthylthiacalix[4]arene‐based M₂Ln₂ complexes with M=Mn(II), Co(II), and Ln=Gd, Pr, Eu, but unlike those systems, it exhibits intricated cooperative low‐temperature magnetic properties arising from the presence of intercluster interactions. At T<8.5 K the complex shows weak spin‐canted ferromagnetism and field induced metamagnetic phase transition. The paramagnetic behavior observed at temperatures higher than 8.5 K is similar to that previously reported for the Mn₂Gd₂ complex, this being indicative of the existence of competitive ferro‐ and antiferromagnetic intracluster interactions.

中文翻译：

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对叔丁基噻唑杯[4]芳烃的Mn2Tb2四核配合物的合成，结构和磁性

合成了一种新的以叔丁基硫代杯[4]芳烃为基础的四核3d-4f金属配合物，该复合物具有Mn ₂ Tb ₂核，并通过X射线衍射研究了其分子和晶体结构。复杂的几何形状类似于早期合成的叔丁硫杂杯[4]芳烃基的M ₂ Ln ₂络合物，其中M = Mn（II），Co（II）和Ln = Gd，Pr，Eu，但与它们不同系统中，由于存在簇间相互作用而表现出复杂的协同低温磁性能。在T <8.5 K时，复合物显示出弱的自旋倾斜铁磁性和磁场诱导的亚磁相变。在高于8.5 K的温度下观察到的顺磁行为与先前报道的Mn相似₂ Gd ₂络合物，这表明存在竞争性铁磁性和反铁磁性团簇内部相互作用。