Transformation Network Culminating in a Heteroleptic Cd₆L₆L′₂ Twisted Trigonal Prism

Transformations between three-dimensional metallosupramolecular assemblies can enable switching between the different functions of these structures. Here we report a network of such transformations, based upon a subcomponent displacement strategy. The flow through this network is directed by the relative reactivities of different amines, aldehydes, and di­(2-pyridyl)­ketone. The network provides access to an unprecedented heteroleptic Cd6L6L′2 twisted trigonal prism. The principles underpinning this network thus allow for the design of diverse structural transformations, converting one helicate into another, a helicate into a tetrahedron, a tetrahedron into a different tetrahedron, and a tetrahedron into the new trigonal prismatic structure type. The selective conversion from one host to another also enabled the uptake of a desired guest from a mixture of guests.三维金属超分子组装体（three-dimensional metallosupramolecular assemblies）间的结构转化，可实现这类组装体不同功能间的切换。本文报道了一套基于亚组分置换策略（subcomponent displacement strategy）的转化反应网络，其反应流向由不同胺类、醛类与二(2-吡啶基)酮（di(2-pyridyl)ketone）的相对反应活性调控。通过该网络，我们成功制备出前所未有的非均配型Cd6L6L′2扭曲三棱柱（heteroleptic Cd6L6L′2 twisted trigonal prism）结构。依托该网络的设计原则，可构建多样化的结构转化路径，实现从一种螺旋配合物（helicate）到另一种螺旋配合物、螺旋配合物到四面体结构、一种四面体结构到另一种不同四面体结构，以及四面体结构到新型三棱柱型结构的转化。此外，借助从一种主体结构到另一种主体结构的选择性转化，还可实现从混合客体中选择性捕获目标客体。