Structures and rearrangement reactions of 4-aminophenol(H 2O)1+ and 3-aminophenol(H2O) 1+ clusters

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Abstract

In this paper the structures of 4-aminophenol(H2O) 1+ and 3-aminophenol(H2O)1+ clusters are investigated in molecular beam experiments by different IR/UV-double resonance techniques as well as the mass analyzed threshold ionization spectroscopy yielding both inter- and intramolecular vibrations of the ionic and neutral species. Possible structures are extensively calculated at the level of density functional theory (DFT) or at the ab initio level of theory. From the experimental and theoretical investigations it can be concluded that in the case of 4-aminophenol(H2O)1 one O-H⋯O hydrogen-bonded structure exists in the neutral cluster but two structures containing either an O-H⋯O or a N-H⋯O hydrogen-bonded arrangement are observed in the spectra of the ionic species. This observation is a result of an intramolecular rearrangement reaction within the ion which can only take place if high excess energies are used. A reaction path via the CH bonds is calculated and explains the experimental observations. In the case of 3-aminophenol(H2O)1+ only one O-H⋯O bound structure is observed both in the neutral and ionic species. Ab initio and DFT calculations show that due to geometrical and energetical reasons a rearrangement cannot be observed in the 3-aminophenol(H2O) 1+ cluster ion. © 2005 American Institute of Physics.

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Gerhards, M., Jansen, A., Unterberg, C., & Gerlach, A. (2005). Structures and rearrangement reactions of 4-aminophenol(H 2O)1+ and 3-aminophenol(H2O) 1+ clusters. Journal of Chemical Physics, 123(7). https://doi.org/10.1063/1.2008255

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