Journal
CHEMICAL PHYSICS LETTERS
Volume 779, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2021.138852
Keywords
Reaction dynamics; Reactivity of electronically excited states; Prebiotic chemistry
Funding
- Italian Space Agency (ASI) [ASI DC-VUM-2017-034, 20193U.0]
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This study reports on the mechanism of the reaction between electronically excited atomic nitrogen and pyridine, indicating that it can proceed via ring-contraction or H-displacement mechanisms, and discusses the implications for prebiotic chemistry and the chemistry of Saturn's moon Titan.
The reactivity of the prototypical aromatic six-membered N-heterocyclic pyridine is of relevance in atmospheric/ combustion chemistry, as well as astrochemistry and prebiotic chemistry. Yet, experimental/theoretical studies of elementary reactions involving pyridine are scarce, with little information on primary reaction products and their branching fractions (BFs). Here, we report crossed molecular beam studies of the reaction of electronically excited atomic nitrogen, N(2D), with pyridine. This reaction can proceed via ring-contraction (BF approximate to 0.35) or Hdisplacement (BF approximate to 0.65) mechanisms, while the inclusion of N(2D) into the ring leads to pyrimidine + CH. Implications for prebiotic chemistry and the chemistry of Saturn's moon Titan are noted.
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