In 2022, H. Wei and colleagues reported the first solution-phase synthesis and crystalline isolation of aza-triangulene, along with its cation. The result brought these unusual high-spin molecules beyond earlier on-surface synthesis and enabled detailed characterization of both forms.
What the 2022 study achieved
Aza-triangulene is a nitrogen-containing relative of triangulene, an all-carbon molecule of interest because of its unusual spin properties. The study’s central advance was making and isolating aza-triangulene in solution, then obtaining crystals of the neutral molecule and its cation. Crystalline samples allowed the team to examine the structures in detail.
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The work was reported as “Solution-Phase Synthesis and Isolation of An Aza-Triangulene and Its Cation in Crystalline Form” in Angewandte Chemie International Edition, volume 61, article e202210386 (DOI: 10.1002/anie.202210386).
How the synthesis worked
The authors assembled the framework from an amine decorated with aromatic groups. The route used Suzuki couplings, cyclisations and redox reactions. Bulky electron-withdrawing groups were incorporated to help stabilize the structure: the report describes them as reducing energy associated with unpaired electrons and blocking the molecule’s most reactive sites.
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This is a high-level account of the route, not a reproducible laboratory protocol. Exact quantities, reaction conditions and yields are not established by the accessible publication record summarized here.
Why the cation matters
The team oxidized neutral aza-triangulene to form its cation. The cation was described as an isoelectronic analogue of parent all-carbon triangulene. That relationship makes it useful to distinguish the two forms: the study isolated and crystallized both neutral aza-triangulene and the oxidized cation, rather than reporting a single interchangeable species.
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How the molecules were characterized
Electron paramagnetic resonance (EPR) and cyclic voltammetry supported the high-spin assignments and provided information about magnetic properties and bond lengths. Computational calculations were also reported as support for the experimental findings. Together, these approaches let the authors assess the electronic and structural picture, rather than relying on synthesis alone.
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Chemistry World reported an estimated half-life of 11 days for neutral aza-triangulene under ambient air and light (2022). That estimate is specific to the neutral form under those stated environmental conditions; it is not a general shelf-life for the cation, other solvents, protected storage or every possible use.
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How this result differs from later aza-triangulene research
Solution-isolated molecule versus a later derivative
A 2023 study investigated a star-shaped non-fullerene acceptor that incorporates an aza-triangulene core, including its optoelectronic and photovoltaic properties. That is a distinct derivative, not the same compound as the aza-triangulene isolated in the 2022 solution-phase work.
Solution-phase species versus surface-bound systems
A separate study examined fused aza-triangulenes formed on metal surfaces. It reported substrate-dependent charge transfer and magnetic fingerprints: an anionic closed-shell species on Ag(111), an open-shell cation on Au(111), and magnetic fingerprints only for asymmetric fused dimers in the described experiments. These surface-bound systems are not direct measurements of the original solution-phase molecules.
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Why the synthesis could matter
High-spin polycyclic hydrocarbons may be relevant to future research in spintronics, quantum devices and organic batteries. Those are prospective research directions, not evidence that aza-triangulene is already used in commercial devices. The 2022 contribution is more specific: it established a route to crystalline solution-phase samples of the neutral molecule and its cation, making these forms available for detailed study.
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