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<p>A general method for constructing (Au<sub>3</sub>)<sub>4</sub><b>L</b><sub>4</sub> face-capped tetrahedral organometallic cages was established based on the combination of metal-metal-bonded Au<sub>3</sub> clusters and C<sub>3</sub>-symmetric tris-NHC ligands. Two of the formed cages were observed to have nearly identical cluster-cluster distances in the crystal state; however, they exhibited distinct guest properties. The intramolecular CH⋯<i>π</i> interactions were identified as key stabilizing factors for the formation of a tetrahedral architecture and affected the uptake of guest species by sufficiently modulating the cavity size and shape. Especially, a series of Group IVA tetramethyl compounds, such as Si(CH<sub>3</sub>)<sub>4</sub>, Ge(CH<sub>3</sub>)<sub>4</sub>, and Sn(CH<sub>3</sub>)<sub>4</sub>, were found to be encapsulated by the host and the inclusion complexes were unambiguously confirmed by single-crystal X-ray diffraction.</p>

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Self-assembly and guest-binding properties of face-capped (Au3)4L4 capsules

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • Sui-Qian Wang,
  • Li-Ying Sun,
  • Le Zhang,
  • Chen Zou,
  • F. Ekkehardt Hahn,
  • Ying-Feng Han

摘要

A general method for constructing (Au3)4L4 face-capped tetrahedral organometallic cages was established based on the combination of metal-metal-bonded Au3 clusters and C3-symmetric tris-NHC ligands. Two of the formed cages were observed to have nearly identical cluster-cluster distances in the crystal state; however, they exhibited distinct guest properties. The intramolecular CH⋯π interactions were identified as key stabilizing factors for the formation of a tetrahedral architecture and affected the uptake of guest species by sufficiently modulating the cavity size and shape. Especially, a series of Group IVA tetramethyl compounds, such as Si(CH3)4, Ge(CH3)4, and Sn(CH3)4, were found to be encapsulated by the host and the inclusion complexes were unambiguously confirmed by single-crystal X-ray diffraction.