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Reaction of Hydrated Electrons (H2O)n- with Carbon Dioxide and Molecular Oxygen: Hydration of the CO2- and O2- Anions

Domenii publicaţii > Chimie + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: O. P. Balaj, C.-K. Siu, I. Balteanu, M. K. Beyer, and V. E. Bondybey

Editorial: Chem. Eur. J., 10, p.4822-4830, 2004.

Rezumat:

The gas-phase reactions of hydrated electrons with carbon dioxide and molecular oxygen were studied by Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. Both CO2 and O2 react efficiently with (H2O)n- because they possess low-lying empty pi* orbitals. The molecular CO2- and O2- anions are concurrently solvated and stabilized by the water ligands to form CO2-(H2O)n and O2-(H2O)n. Core exchange reactions are also observed, in which CO2-(H2O)n is transformed into O2-(H2O)n upon collision with O2. This is in agreement with the prediction based on density functional theory calculations that O2-(H2O)n clusters are thermodynamically favored with respect to CO2-(H2O)n. Electron detachment from the product species is only observed for CO2-(H2O)2, in agreement with the calculated electron affinities and solvation energies.

Cuvinte cheie: gas-phase reactions, hydrated electrons, nanodroplets, radical ions, solvation