Control over the integrative self-sorting of metallo-supramolecular assemblies opens up possibilities for introducing increased complexity and function into a single self-assembled architecture. Herein, the relationship between the geometry of three ligand components and morphology of three self-sorted heteroleptic [Pd2 L2 L'2 ]4+ cages is examined. Pd-mediated assembly of two bis-monodentate pyridyl ligands with native bite angles of 75° and 120° affords a cis-[Pd2 L2 L'2 ]4+ cage while the same reaction with two ligands with bite angles of 75° and 60° gives an unprecedented, self-penetrating structural motif; a trans-[Pd2 (anti-L)2 L'2 ]4+ heteroleptic cage with a "doubly bridged figure eight" topology. Each heteroleptic assembly can be formed by cage-to-cage conversion of the homoleptic precursors and morphological control of [Pd2 L2 L'2 ] cages is achieved by selective ligand displacement transformations in a system of three ligands and at least six possible cage products.

中文翻译：

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异型顺式和反式Pd2 L2 L'2笼的形态学控制。

对金属-超分子组装体的整体自分类的控制为将增加的复杂性和功能引入单个自组装体系结构开辟了可能性。在此，检查了三个配体组分的几何形状与三个自选的[Pd2 L2 L'2] 4+笼型杂合剂的形态之间的关系。钯介导的两个自然咬合角为75°和120°的双单齿吡啶基配体的组装提供了一个顺式[Pd2 L2 L'2] 4+笼，而相同的反应是两个咬合角为75°和60的配体°赋予了前所未有的自我渗透的结构图案；具有[双桥八字形]拓扑结构的反式[Pd2（抗L）2 L'2] 4+杂合笼。