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Published on: July 19, 2019
Stability and quantum tunnelling in the intramolecular proton transfer of molybdic acid
Juan Julian Santoyo-Flores1, Yeshayahu Ben-Eliyahu2, Sebastian Kozuch1
1Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 841051, Israel. kozuch@bgu.ac.il.
Abstract:
We explored with computational means the stability and interconversion kinetics of several possible molybdenum complexes in neutral or slightly acidic media, including, among others, [MoO(OH)4(H2O)], [MoO2(OH)2(H2O)2], [MoO(OH)4], and [MoO3(H2O)]. These complexes are related through three kinds of intramolecular proton-transfer reactions, allowing one complex to convert to another. In particular, we analysed the role of quantum tunnelling at low and high temperatures, with and without an explicit water molecule catalysing the reactions through a Grotthuss type of proton shuttle mechanism. We identified [MoO2(OH)2(H2O)2], compound 4, as the most stable structure, in line with previous studies. At room temperature all the interconversions are fast, allowing the system to readily reach compound 4 from every other possible complex; under these conditions, thermally activated tunnelling is a measurable but small factor. However, our results indicate that at low temperatures tunnelling is the only plausible mechanism for the reaction, permitting fast rearrangements to reach compound 4 even in the absence of enough thermal energy to overcome the barriers.
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