The triplet state of the cyclopentadienyl cation is aromatic

the verdict

SUPPORTED

the evidence backs this

Recorded sources

2 sources for · 0 against

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Quantum chemical calculations indicate that the triplet state of the cyclopentadienyl cation is energetically favored in the gas phase and exhibits aromatic character according to Baird's rule.

The analysis

The retrieved papers, specifically [9] and [10], directly discuss the cyclopentadienyl cation and note that its triplet state is energetically favored and exhibits aromaticity (Baird aromaticity for 4n electron triplet states), while the singlet is typically antiaromatic. Therefore, the claim is supported by the literature.

Evidence for · 2

Structural characterization and reactivity of a room-temperature-stable, antiaromatic cyclopentadienyl cation salt.

Recorded source metadata

Yannick Schulte, Christoph Wölper, Susanne M Rupf, Moritz Malischewski, Daniel J SantaLucia, Frank Neese, Gebhard Haberhauer, Stephan Schulz. Structural characterization and reactivity of a room-temperature-stable, antiaromatic cyclopentadienyl cation salt.. 2024. https://doi.org/10.1038/s41557-023-01417-5

The study notes that quantum chemical calculations show the aromatic triplet state of the cyclopentadienyl cation is energetically favored in the gas phase.

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More for · 1

A new architecture for high spin organics based on Baird's rule of 4n electron triplet aromatics.

Recorded source metadata

Michael Mauksch, Svetlana B Tsogoeva. A new architecture for high spin organics based on Baird's rule of 4n electron triplet aromatics.. 2017. https://doi.org/10.1039/c6cp08563f

Computations indicate that the cyclopentadienyl cation possesses a triplet ground state that exhibits Baird aromaticity.

Source citation format

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first checked01 Aug 2026

judged → SUPPORTED · 7501 Aug 2026

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