Reaction of cyanomethylene with nitric oxide and oxygen at 298 K: HCCN + NO, O2

Article abstract of DOI:10.1021/jp962686g

The reactions of the cyanomethylene (HCCN) radical with nitric oxide (NO) and with molecular oxygen (O₂) have been investigated using infrared kinetic spectroscopy. The overall second-order rate constant for each reaction has been determined using pseudo-first-order methods yielding (3.5 ± 0.6) × 10^-11 cm³ molecule^-1 s^-1 for the reaction with NO and (1.8 ± 0.4) × 10^-12 cm^-3 molecule^-1 s^-1 for the reaction with O₂. For each reaction, several products were observed, but none were quantified. Hydrogen cyanide (HCN) and fulminic acid (HCNO) were observed as products of the reaction with NO. For the reaction with O₂, HCN, hydrogen isocyanide (HNC), and carbon dioxide (CO₂) were observed. Species searched for but not detected from either reaction include isocyanic acid (HNCO), cyanic acid (HOCN), formyl (HCO) radical, isofulminic acid (HONC), hydroxyl radical (OH), and ethynyl radical (C₂H). In addition, NO was searched for, but not observed, as a product of the O₂ reaction. On the time scale of our experiments, no reaction between HCCN and any of the following species was observed (k < 10^-13 cm³ molecule^-1 s^-1): methane (CH₄), CO₂ acetylene (C₂H₂), ethylene (C₂H₄), carbon monoxide (CO), and hydrogen (H₂).