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Triangulenes: From Precursor Design to On-Surface Synthesis and Characterization
Jie Su1,2, Mykola Telychko1,2, Shaotang Song1
1Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.
Angewandte Chemie (International Ed. in English)
|December 25, 2019
Summary
Researchers synthesized and characterized zigzag-edged triangular graphene molecules (ZTGMs) like [3]-, [4]-, and [5]triangulene. These molecules show promise for molecular spintronics due to their high-spin ground states.
Area of Science:
- Materials Science
- Organic Chemistry
- Condensed Matter Physics
Background:
- Triangulenes and higher homologues are zigzag-edged triangular graphene molecules (ZTGMs) with high-spin ground states.
- These open-shell molecules are promising for molecular spintronics due to ferromagnetically coupled edge states.
- Synthesis and direct observation of unsubstituted triangulenes have been challenging due to high reactivity.
Purpose of the Study:
- To review recent advances in the on-surface synthesis and characterization of unsubstituted triangulene molecules.
- To highlight key aspects of precursor design, synthetic strategies, and characterization of ZTGMs.
- To discuss current challenges and future directions in the field of triangulene research.
Main Methods:
- On-surface synthesis utilizing advanced precursor design.
- Characterization techniques for observing molecular structure and electronic properties.
- Homologous series synthesis of [3]-, [4]-, and [5]triangulene.
Main Results:
- Successful on-surface synthesis and characterization of unsubstituted [3]-, [4]-, and [5]triangulene.
- Demonstration of high-spin ground states and ferromagnetically coupled edge states.
- Insights into precursor design enabling synthesis of reactive ZTGMs.
Conclusions:
- Recent advances have overcome long-standing synthesis challenges for unsubstituted triangulenes.
- On-surface synthesis provides a viable route to study these high-spin molecules.
- Triangulenes are promising candidates for future molecular spintronics applications.
