In this work, we synthesized two Cu-based heterometal–oxo clusters 1 and 2 based on M(III)₄O₄ (M = Fe/In) cubane centers and obtained the corresponding dimers 3 and 4 by connecting Cu atoms on the cluster cores with the auxiliary ligand 4,4′- bipyridine. They were characterized by single-crystal X-ray diffraction (SCXRD), powder X-ray diffraction (PXRD), and other tests. We conducted magnetic property study on compounds 1–4. The variable-temperature magnetic susceptibility test shows that compounds 1 and 3 exhibit significant ferromagnetic interactions at low temperatures, while compounds 2 and 4 exhibit overall antiferromagnetic interactions. When the metal at the cubane changes from magnetic Fe to nonmagnetic In, the magnetic interactions in the compound are weakened to a certain extent. Through dimerization, the extreme values of the variable-temperature magnetic susceptibility appear (1 to 3)/disappear (2 to 4) in the low-temperature section. We investigated the magnetic structure correlation of compounds 1–4 through bond lengths, bond angles, and distances between magnetic atoms. The results showed that compounds 1–4 exhibited significant magnetic coupling diversity.

中文翻译：

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具有 M(III)4O4 古巴烷核心的二茂铁功能异金属-Oxo 簇的设计和自组装

在这项工作中，我们合成了两个基于M(III) ₄ O ₄ (M = Fe/In)立方烷中心的Cu基异金属-氧簇1和2 ，并通过连接簇上的Cu原子获得了相应的二聚体3和4具有辅助配体 4,4'-联吡啶的核心。通过单晶X射线衍射(SCXRD)、粉末X射线衍射(PXRD)和其他测试对它们进行了表征。我们对化合物1-4进行了磁性能研究。变温磁化率测试表明，化合物1和3在低温下表现出显着的铁磁相互作用，而化合物2和4则表现出整体反铁磁相互作用。当立方烷处的金属从磁性Fe转变为非磁性In时，化合物中的磁性相互作用在一定程度上减弱。通过二聚化，变温磁化率的极值在低温段出现( 1～3 )/消失( 2～4 )。我们通过键长、键角和磁性原子之间的距离研究了化合物1 – 4的磁性结构相关性。结果表明，化合物1-4表现出显着的磁耦合多样性。