Truncated Sierpiński Triangular Assembly from a Molecular Mortise-Tenon Joint

Area of Science:

• Supramolecular Chemistry
• Materials Science
• Coordination Chemistry

Background:

• Constructing intricate, giant molecular structures through self-assembly is crucial but challenging.
• Molecular design principles are essential for achieving quantitative and spontaneous assembly.
• Novel metallo-supramolecular architectures require innovative design strategies.

Purpose of the Study:

• To present a novel architectural design principle based on multicomponent self-assembly.
• To demonstrate the formation of diverse supramolecular architectures using a hexatopic terpyridine-based metallo-organic ligand.
• To explore the application of size- and shape-fit principles in ligand selection for molecular assembly.

Main Methods:

• Utilized a hexatopic terpyridine-based metallo-organic ligand ([Ru2T2K]) for multicomponent self-assembly.
• Employed one-pot, nearly quantitative assembly with complementary ligands (V, K, [Ru2X2V]).
• Characterized the resulting supramolecular assemblies using NMR, ESI-MS, TWIM-MS, and TEM analyses.

Main Results:

• Successfully synthesized three distinct supramolecular architectures: a trapezoid (Zn5[Ru2T2K]V2), a hollow hexagon (Zn15[Ru2T2K]3K3), and a giant star-shaped molecule (Zn18[Ru2T2K]3[Ru2X2V]3).
• Demonstrated the effectiveness of the size- and shape-fit principle, analogous to mortise-tenon joints, in directing assembly.
• Confirmed the stability and structural integrity of the assemblies through comprehensive analytical techniques.

Conclusions:

• The presented multicomponent self-assembly strategy enables the rational design and synthesis of complex metallo-supramolecular architectures.
• This approach facilitates the creation of sophisticated designer supramolecules and novel nonbiological materials.
• The multivalent connections within ligands ensure the formation of stable and well-defined supramolecular assemblies.