In the past two decades, tremendous progress has been made in the field of single-molecule magnets (SMMs), which not only achieves breakthroughs in various key indicators (flipping energy barrier and hysteresis temperature), but also expands SMMs of various types (3d, 4f, 3d–4f and 5f) and different connection methods. Among the many different types of SMM mentioned above, the SMM based on the 4f metal center has made the biggest breakthrough. Introducing 3d metal ions into lanthanide complexes to form 3d–4f heterometallic complexes can promote strong magnetic exchange between multiple metal centers, resulting in magnetic properties different from 3d and 4f complexes. Therefore, the expansion of the structure and magnetic properties of 3d–4f heterometallic complexes can promote the progress in the field of SMM. In this review, we summarize the structure and magnetic properties of 3d–4f heterometallic complexes formed by different types of organic ligands.

在过去的二十年中，单分子磁体（SMM）领域取得了巨大进步，不仅在各种关键指标（翻转能垒和磁滞温度）方面取得了突破，而且还扩展了各种类型的SMM（3d ，4f，3d–4f和5f）以及不同的连接方法。在上述许多不同类型的SMM中，基于4f金属中心的SMM取得了最大的突破。在镧系元素络合物中引入3d金属离子形成3d–4f杂金属络合物可以促进多个金属中心之间的强磁性交换，从而产生不同于3d和4f络合物的磁性。因此，3d–4f杂金属配合物的结构和磁性的扩展可以促进SMM领域的发展。在这篇评论中，