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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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Published on: February 6, 2020

Narcissistic self-sorting in anion-coordination-driven assemblies.

Xiaotong Zhao¹, Heng Wang, Boyang Li

¹Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi'an 710069, China. wubiao@nwu.edu.cn.

Chemical Communications (Cambridge, England)

|May 26, 2021

Summary

This summary is machine-generated.

Researchers synthesized novel tris-bis(urea) ligands that self-assembled with anions. Narcissistic self-sorting occurred, forming pure ligand assemblies, not mixed ones, confirmed by NMR and MS studies.

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Area of Science:

Supramolecular chemistry
Coordination chemistry
Organic synthesis

Background:

Urea-based ligands are crucial in supramolecular chemistry for molecular recognition and self-assembly.
Triphenylamine-based spacers offer unique electronic and structural properties for designing complex architectures.
Anionic guests like sulfate and phosphate are common targets for host-guest chemistry.

Purpose of the Study:

To synthesize novel C3-symmetric tris-bis(urea) ligands with triphenylamine spacers.
To investigate the self-assembly of these ligands with sulfate and phosphate anions.
To explore the self-sorting behavior of the ligands during assembly.

Main Methods:

Synthesis of tris-bis(urea) ligands via established organic chemistry protocols.
Supramolecular self-assembly experiments in solution with sulfate and phosphate anions.
Structural characterization using Nuclear Magnetic Resonance (NMR) spectroscopy and Mass Spectrometry (MS).

Main Results:

Successful synthesis of three tris-bis(urea) ligands with triphenylamine-based C3-symmetric spacers.
Formation of anionic A3L2 pinwheel helices and A4L4 tetrahedra through self-assembly with sulfate and phosphate, respectively.
Observation of narcissistic self-sorting, where each assembly exclusively incorporated a single type of ligand, preventing mixed-ligand structures.

Conclusions:

The synthesized tris-bis(urea) ligands effectively self-assemble with specific anions into defined supramolecular architectures.
Narcissistic self-sorting is a dominant phenomenon in these systems, leading to highly selective, single-ligand assemblies.
This work demonstrates precise control over supramolecular assembly through ligand design and highlights the potential for creating complex structures with high fidelity.