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Detections of interstellar aromatic nitriles 2-cyanopyrene and 4-cyanopyrene in TMC-1

https://doi.org/10.1038/s41550-024-02410-9

Wenzel, Gabi; Speak, Thomas H; Changala, P Bryan; Willis, Reace_H J; Burkhardt, Andrew M; Zhang, Shuo; Bergin, Edwin A; Byrne, Alex N; Charnley, Steven B; Fried, Zachary_T P; et al (February 2025, Nature Astronomy)

Free, publicly-accessible full text available February 1, 2026
Detection of interstellar 1-cyanopyrene: A four-ring polycyclic aromatic hydrocarbon

https://doi.org/10.1126/science.adq6391

Wenzel, Gabi; Cooke, Ilsa R; Changala, P Bryan; Bergin, Edwin A; Zhang, Shuo; Burkhardt, Andrew M; Byrne, Alex N; Charnley, Steven B; Cordiner, Martin A; Duffy, Miya; et al (November 2024, Science)

Polycyclic aromatic hydrocarbons (PAHs) are organic molecules containing adjacent aromatic rings. Infrared emission bands show that PAHs are abundant in space, but only a few specific PAHs have been detected in the interstellar medium. We detected 1-cyanopyrene, a cyano-substituted derivative of the related four-ring PAH pyrene, in radio observations of the dense cloud TMC-1, using the Green Bank Telescope. The measured column density of 1-cyanopyrene is $\sim 1 {.52×10}^{12}$ cm⁻², from which we estimate that pyrene contains up to 0.1% of the carbon in TMC-1. This abundance indicates that interstellar PAH chemistry favors the production of pyrene. We suggest that some of the carbon supplied to young planetary systems is carried by PAHs that originate in cold molecular clouds.
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Free, publicly-accessible full text available November 15, 2025
Copper-Catalyzed Transfer Hydrodeuteration of Aryl Alkenes with Quantitative Isotopomer Purity Analysis by Molecular Rotational Resonance Spectroscopy

https://doi.org/10.1021/jacs.1c00884

Vang, Zoua Pa; Reyes, Albert; Sonstrom, Reilly E.; Holdren, Martin S.; Sloane, Samantha E.; Alansari, Isabella Y.; Neill, Justin L.; Pate, Brooks H.; Clark, Joseph R. (May 2021, Journal of the American Chemical Society)
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