Hyperthermal O-Atom Exchange Reaction O2 + CO2 through a CO4 Intermediate
摘要:
O-2 and CO2 do not react under ordinary conditions because of the thermodynamic stability of CO2 and the large activation energy required for multiple double-bond cleavage. We present evidence for a gas-phase O-atom exchange reaction between neutral O-2 and CO2 at elevated collision energies (similar to 160 kcal mol(-1)) from crossed-molecular-beam experiments. CCSD(T)/aug-cc-pVTZ calculations demonstrate that isotope exchange can occur on the ground triplet potential energy surface through a short-lived CO4 intermediate that isomerizes via a symmetric CO4 transition state containing a bridging oxygen atom. We propose a plausible adiabatic mechanism for this reaction supported by additional spin-density calculations.
Infrared Spectroscopic and Density Functional Theory Study on the Reactions of Rhodium and Cobalt Atoms with Carbon Dioxide in Rare-Gas Matrixes
作者:Ling Jiang、Yun-Lei Teng、Qiang Xu
DOI:10.1021/jp0728095
日期:2007.8.1
Reactions of laser-ablated rhodium and cobalt atoms with carbon dioxide molecules in solid argon and neon have been investigated using matrix isolation infrared spectroscopy. The OMCO, O2MCO, OMCO(-) (M = Rh, Co), OCo2CO, and OCoCO(+) molecules have been formed and characterized on the basis of isotopic shifts, mixed isotopic splitting patterns, ultraviolet irradiation, CCl4-doping experiments, and