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Theoretical study of the 1,3-hydrogen shift of triazene in water.

Research paper by I I Fdez Galván, M A MA Aguilar, M F MF Ruiz-López

Indexed on: 21 Jul '06Published on: 21 Jul '06Published in: Journal of Physical Chemistry B



Abstract

The 1,3-hydrogen shift of triazene in aqueous solution was studied with a combination of QM/MM methods. First, the different species involved were characterized and the activation free-energies calculated with ASEP/MD, a method that makes use of the mean field approximation. Then the reaction dynamics was simulated with a QM/MM/MD method. A very strong influence of the solvent was observed, both specific, with the participation of a water molecule, and from the rest of the solvent. The effect of solvation on the geometry and electron distribution of triazene is important: N-N bond lengths tend to be more similar and the molecule acquires a planar structure. For the transition state structure, a substantial degree of ionic nature was found. Dynamic solvent effects were also analyzed.