When Self‐Assembly Fails: Stepwise Metal‐Directed Synthesis of [2]Catenanes |
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Authors: | Eva M López‐Vidal Prof Marcos D García Prof Carlos Peinador Prof José M Quintela |
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Institution: | Centro de Investigaciones Científicas Avanzadas (CICA) and Departamento de Química Fundamental, Universidade da Coru?a, Facultad de Ciencias, Rúa da Fraga?10, 15071A Coru?a (Spain). |
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Abstract: | On the attempted synthesis of a series of homo‐ and heterotrimetallic 2]catenanes by the self‐assembly of a 2‐(pyridin‐4‐ylmethyl)‐2,7‐diazapyrenium ligand, (ethylenediamine)palladium(II) or platinum(II) nitrate, and a dioxoaryl bis(N‐monoalkyl‐4,4′‐bipyridinium) salt as building blocks, both the one‐pot direct self‐assembly of the components and the so called “magic ring” approach fail to produce the expected trinuclear 2]catenanes under thermodynamically driven conditions. However, one of the target supramolecules is obtained by following a stepwise protocol, consisting of the threading of a dinuclear PtII metallacycle and the dioxoaryl bis(N‐monoalkyl‐4,4′‐bipyridinium) axle, followed by kinetically controlled PtII‐directed cyclization of the corresponding pseudorotaxane. |
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Keywords: | catenanes molecular recognition platinum self‐assembly supramolecular chemistry |
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