AI Article Synopsis
- Kinetic control of molecular self-assembly is challenging due to incomplete knowledge of the mechanisms involved.
- The study presents the efficient formation of a [PdL] cage structure using naphthalene-based ligands and Pd(II) ions, achieving a high yield by manipulating the energy landscape.
- It explores how the presence of different anionic guests affects the self-assembly pathways, with findings that preferred guests lead to simpler intermediates and that the final cage-closure step is the slowest part of the process, while weaker guests result in more complex intermediates before forming the cage.
Article Abstract
Kinetic control of molecular self-assembly remains difficult because of insufficient understanding of molecular self-assembly mechanisms. Here we report the formation of a metastable [PdL] cage structure composed of naphthalene-based ditopic ligands (L) and Pd(II) ions in very high yield (99%) under kinetic control by modulating the energy landscape. When self-assembly occurs with anionic guests in weakly cooordinating solvent then suitable intermedites and the metastable cage is formed. These conditions also prevent further transformation into the thermodynamically decomposed state. The cage formation pathways under kinetic control and the effect of the anions encapsulated on the self-assembly processes were investigated by QASAP (quantitative analysis of self-assembly process) and NASAP (numerical analysis of self-assembly process). It was found that the self-assembly with a preferred guest (BF) proceeds through intermediates composed of no more components than the cage ([PdLX] ( ≤ 2, ≤ 4, X indicates a leaving ligand)) and that the final intramolecular cage-closure step is the rate-determining step. In contrast, a weaker guest (OTf) causes the transient formation of intermediates composed of more components than the cage ([PdLX] ( > 2, > 4)), which are finally converted into the cage.
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| http://dx.doi.org/10.1021/jacs.9b07779 | DOI Listing |
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