"Nature Communications" by Prof. Ping from Shanghai University of Science and Technology/Professor Wang Shiyong from Shanghai Jiao Tong University: High-yield and high-spin tri-trimers achieved through surface dehydration reaction!

Triangleene is a class of zigzag-edged triangular nanographenes with a high-spin ground state, and this unique morphology makes it impossible for trigonene and its higher homologues to build Kekule-type resonance structures without generating unpaired electrons, so trigonenes Due to the high chemical reactivity and poor stability of its higher homologues, it is difficult to obtain unsubstituted pure zigzag-edge triangularene or its higher homologues in traditional solution chemistry

Recently, Prof.

Fig.

【Design of Trimer Trimers】

In previous work reports, the triangularene dimer connected by a benzene ring or a single bond has an antiferromagnetic coupling between the two triangularene units, and the two sublattices of AB have the same number of carbon atoms, resulting in the final net spin S is 0

Figure 2 Chemical structure characterization of the precursor ring trimerization product with terminal alkynyl groups

【Synthesis and Characterization of Tb】

The preparation of Tb relies on the traditional cyclotrimerization of alkynyl derivatives on the surface to form additional benzene ring structures

Fig.

【Synthesis and Characterization of Tt】

To improve the reaction yield of tri-trimers, we newly discovered a surface dehydration reaction

Fig.

[Electronic structure of Tt and Tb]

A detailed study and comparison of the electronic structures of the two tri-trimers were carried out

Fig.

[Tt high spin magnetic ground state]

To further probe the magnetic ground state of the trimeric structure, the dI/dV differential conductance spectrum was measured near the Fermi level, as shown in Fig.

【Research Summary】

This research result provides a new method for the preparation of high-quality carbon nanomaterials based on triangularene-based high-spin systems, and further understands the magnetic interaction in high-spin structures, which is crucial for the realization of carbon-based spintronic devices