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Two dominant self-assembly pathways to a Pd3L6 double-walled triangle.

Tomoki Tateishi1, Shumpei Kai, Yuya Sasaki

  • 1Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902, Japan. chiraoka@mail.ecc.u-tokyo.ac.jp.

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This study used NMR analysis to track the self-assembly of a palladium-based double-walled triangle. The complex forms through single-walled chains that then macrocyclize and form double walls.

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Area of Science:

  • Supramolecular chemistry
  • Coordination chemistry
  • Materials science

Background:

  • Self-assembly is a key process in creating complex molecular architectures.
  • Palladium coordination complexes offer versatile building blocks for supramolecular structures.
  • Understanding assembly pathways is crucial for designing novel materials.

Purpose of the Study:

  • To quantitatively analyze the self-assembly process of a Pd3L6 double-walled triangle (DWT).
  • To elucidate the step-by-step mechanism of DWT formation using NMR spectroscopy.
  • To investigate the role of intermediate structures in the final assembly.

Main Methods:

  • Quantitative analysis of self-assembly process (QASAP) using Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Utilizing PdPy*4(BF4)2 (where Py* is 3-chloropyridine) and V-shaped ditopic ligands (L) as precursors.
  • Monitoring the formation of trinuclear single-walled chains and subsequent macrocyclization.

Main Results:

  • The self-assembly of the Pd3L6 DWT proceeds via trinuclear single-walled chains.
  • Intramolecular macrocyclization of these chains is a critical step in the assembly.
  • The formation of double-walls occurs after macrocyclization, leading to the final DWT structure.

Conclusions:

  • The study provides a detailed mechanistic insight into the formation of a Pd-based DWT.
  • QASAP is an effective method for dissecting complex self-assembly pathways.
  • The findings contribute to the rational design of sophisticated supramolecular architectures.