Five new homodinuclear lanthanide complexes with the general formula [(acac)₄Ln₂(L)] (Ln³⁺ = Dy³⁺ (1), Tb³⁺ (2), Ho³⁺ (3), Er³⁺ (4), and Gd (5)) were synthesized by one-pot [2 + 2] condensation of 2,6-diformyl-4-methylphenol and 1,3-diaminopropane in the presence of various lanthanide acetylacetonates. The eight-coordinate Ln(III) centre adopts a slightly distorted square antiprism geometry with D_4d symmetry. Theoretical analysis and magnetic measurements reveal that the corresponding Dy complex 1 exhibits slow magnetic relaxation behavior, characteristic of a typical SMM with the intramolecular ferromagnetic Dy³⁺⋯Dy³⁺ interaction.

中文翻译：

---

合成，结构和大环席夫碱支持的同双核镧系络合物的磁特性†

五个新的具有通式[（acac）₄ Ln ₂（L）]的同核镧系元素络合物（Ln ³⁺ = Dy ³⁺（1），Tb ³⁺（2），Ho ³⁺（3），Er ³⁺（4）和Gd（5））是在各种镧系元素乙酰丙酮化物存在下，通过一锅[2 + 2]缩合2,6-二甲酰基-4-甲基苯酚和1,3-二氨基丙烷合成的。八坐标Ln（III）中心采用D _4d稍微扭曲的方形反棱镜几何形状对称。理论分析和磁测量表明，相应的Dy配合物1表现出缓慢的磁弛豫行为，这是分子内铁磁Dy ³⁺ ferDy ³⁺相互作用的典型SMM的特征。