Issue 32, 2019

The reaction of hydrated iodide I(H2O) with ozone: a new route to IO2 products

Abstract

We report on an experimental characterization of the isolated reaction of hydrated iodide I(H2O) with ozone O3 at room temperature performed using a radio-frequency ion trap combined with a quadrupole mass spectrometer. Contrary to the oxidation reaction of the bare I ion, the hydrated iodide I(H2O) primarily reacts to form I and IO2 with significant absolute reaction rate constants of 2.0 ± 0.3 × 10−10 cm3 molecule−1 s−1 and 2.5 ± 0.3 × 10−10 cm3 molecule−1 s−1 while direct pathways to IO and IO3 are much weaker. Quantum chemical calculations indicate that in aqueous phase and for atmospherically relevant temperatures, the presence of hydrated iodides are favored over bare I ions, thus suggesting that the chemistry of the hydrated ions is relevant for understanding and modeling atmospheric processes at the air–water interface.

Graphical abstract: The reaction of hydrated iodide I(H2O)− with ozone: a new route to IO2− products

Article information

Article type
Paper
Submitted
28 Mar 2019
Accepted
18 May 2019
First published
28 May 2019

Phys. Chem. Chem. Phys., 2019,21, 17546-17554

The reaction of hydrated iodide I(H2O) with ozone: a new route to IO2 products

R. Teiwes, J. Elm, M. Bilde and H. B. Pedersen, Phys. Chem. Chem. Phys., 2019, 21, 17546 DOI: 10.1039/C9CP01734H

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