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Updated: Dec 25, 2025
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
Published on: February 6, 2020
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Solvent-Dependent Core-Modified Rubyrin Self-Assembly at Liquid/Solid Interfaces.
Chen Chen1,2, Siqi Zhang1,2, Bin Tu2
1Department of Chemistry, School of Science, Beijing Jiaotong University, Beijing 100044, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|March 28, 2020
Summary
Core-modified rubyrins exhibit solvent-dependent self-assembly on graphite surfaces. Different solvents dictate whether these molecules form face-on or edge-on structures, crucial for designing porphyrin-based devices.
Area of Science:
- Materials Science
- Supramolecular Chemistry
- Surface Science
Background:
- Porphyrin derivatives, like rubyrins, are vital for advanced functional materials.
- Controlling molecular self-assembly is key to designing novel electronic and optical devices.
- Understanding structure-property relationships in self-assembled systems is an ongoing challenge.
Purpose of the Study:
- To investigate the self-assembly behavior of novel core-modified rubyrins on highly-oriented pyrolytic graphite (HOPG).
- To explore the influence of solvent choice on the monolayer structures formed by these rubyrins.
- To elucidate the mechanisms governing solvent-directed self-assembly using computational methods.
Main Methods:
- Scanning tunneling microscopy (STM) was used to visualize molecular self-assembly on HOPG.
- Four novel core-modified rubyrins, differing in core structure and substituents, were synthesized and studied.
- Density functional theory (DFT) calculations were employed to understand self-assembly mechanisms.
Main Results:
- Two types of core-modified rubyrins (N2S4-OR(1)/N2Se4-OR(2) and N2S4-OR(3)/N2Se4-OR(4)) showed distinct self-assembly behaviors.
- Solvent-dependent monolayer formation (face-on vs. edge-on) was observed, particularly for rubyrins with phenanthrene-fused pyrrole rings.
- N2S4-OR(3)/N2Se4-OR(4) adopted edge-on and face-on structures in 1-phenyloctane and 1-heptanoic acid, respectively.
- N2S4-OR(1)/N2Se4-OR(2) predominantly formed face-on structures in both solvents.
Conclusions:
- Solvent effects play a critical role in directing the self-assembly of core-modified rubyrins on HOPG surfaces.
- The molecular structure of rubyrins, including the presence of phenanthrene units and meso-aryl substituents, influences their assembly preferences.
- This study provides fundamental insights into controlling molecular organization for the development of porphyrin-based functional materials and devices.
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