Issue 34, 2020

The reaction of isotope-substituted hydrated iodide I(H 182O) with ozone: the reactive influence of the solvent water molecule

Abstract

We report an investigation of the reaction of isotope-substituted hydrated iodide I(H182O) with ozone 16O3 to examine the involvement of the water molecules in the oxidation reactions that terminate with the formation of IO3. Experimentally, we studied the reaction in the gas phase as elementary reactions using a radio-frequency (RF) ion-trap combined with a quadrupole mass spectrometer (QMS). In approximately 1.2% of the reactions of I(H182O) and 16O3, the 18O atom is found to appear in iodine oxide anions, thus giving evidence for a close involvement of the water molecule in a non-negligible number of the reactions towards IO3. As a part of the experimental investigation, the reaction rate constant for the exchange reaction I(H182O) + H162O → I(H162O) + H182O at 300 K was found to be (1.3 ± 0.1) × 10−8 cm3 s−1. Quantum chemical calculations are exploited to establish the energetic difference between I(H182O) and I(H162O).

Graphical abstract: The reaction of isotope-substituted hydrated iodide I(H182O)− with ozone: the reactive influence of the solvent water molecule

Supplementary files

Article information

Article type
Paper
Submitted
15 Jun 2020
Accepted
27 Jul 2020
First published
20 Aug 2020

Phys. Chem. Chem. Phys., 2020,22, 19080-19088

The reaction of isotope-substituted hydrated iodide I(H182O) with ozone: the reactive influence of the solvent water molecule

H. B. Pedersen, J. Elm, C. H. Frederiksen, S. P. S. Jessen, R. Teiwes and M. Bilde, Phys. Chem. Chem. Phys., 2020, 22, 19080 DOI: 10.1039/D0CP03219K

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