München 2004 – wissenschaftliches Programm
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MS: Massenspektrometrie
MS 9: Anionische Systeme
MS 9.1: Vortrag
Donnerstag, 25. März 2004, 17:45–18:00, HS 112
Addition of a Hydrogen Atom to Acetonitrile by Hydrated Electron Nanodroplets — •O. Petru Balaj, Iulia Balteanu, Brigitte Fox-Beyer, Martin Beyer, and Valdimir E. Bondybey — Institut für Physikalische und Theoretische Chemie 2, Technische Universität München, Lichtenberg Str. 4 , 85748 Garching
Solvated electrons are the most fundamental model systems to study electron transfer reactions, and they play an important role in radiation chemistry and biology, as well as in organic and inorganic synthesis.
In the present study, we investigate the reactions of acetonitrile with hydrated electrons (H2O)n− , n = 25 - 60, in a Fourier transform ion cyclotron resonance (FT-ICR) mass spectrometer. More than 25 years ago this reaction was observed by ESR spectroscopy in solution, but the product was not identified.
Our studies indicate that reactivity studies of organic molecules in hydrated electron nanodroplets can yield information complementary to pulsed radiolysis studies in bulk solutions. In the cluster study, the product compositions can be clearly identified by mass spectrometry, and in the present case it could be shown that the hydrated electron does induce a transfer of an H atom from water to acetonitrile. The formation of a solvent-stabilized radical anion as reactive intermediate is suggested to be a possible first step in the organic chemistry of the hydrated electron.