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B. S. Fox-Beyer, I. Balteanu, O. P. Balaj, and M. K. Beyer. Hydrogen formation in the reaction of Zn+(H2O)n with HCl. Phys. Chem. Chem. Phys. , 7, pp. 981-985, 2005.

Abstract: Hydrated singly charged zinc cations Zn+(H2O)n, 6<=n<=53, were studied by Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometry. Black-body radiation induced dissociation results exclusively in sequential loss of individual water molecules. In the reaction of Zn+(H2O)n with gaseous HCl, Zn is oxidized and hydrogen reduced when a second HCl molecule is taken up, leading to the formation of ZnCl+(HCl)(H2O)nm cluster ions and evaporation of atomic hydrogen together with m H2O molecules. The results are compared with earlier studies of Mg+(H2O)n, for which hydrogen formation is already observed without HCl in a characteristic size region. The difference between zinc and magnesium is rationalized with the help of density functional theory calculations, which indicate a distinct difference in the thermochemistry of the reactions involved. The generally accepted hydrated electron model for hydrogen formation in Mg+(H2O)n is modified for zinc to account for the different reactivity.

Keywords: gas-phase reactions, hydrated zinc anions, hydrogen generation

Posted by Balaj O. Petru


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