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Title: Proton transfer, electron binding and electronegativity in ammonium-containing systems
Author: Whiteside, Alexander
ISNI:       0000 0004 2741 8060
Awarding Body: Heriot-Watt University
Current Institution: Heriot-Watt University
Date of Award: 2012
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Using modern electronic structure methods, the ammonia-hydrogen halide complexes and their anions are characterised to determine the number, type, and properties of their minima, and their electron binding energies. Methodological issues of determining the potential energy surfaces of reactive monomers are addressed in the course of this investigation. The energetic origins of the hydrogen-bonded minima are determined by evaluation of the one-body and two-body terms composing the total energy of the complexes, and a rationale for the drive to proton transfer is presented. It is concluded that the systems have qualitatively similar potential surfaces, and that the balance of the one-body and two-body forces determines the number and depth of minima, while the electron acts as a perturbing agent on the one- or two-body energy, depending upon the nature of the minimum encountered. The halogen-bonded structures of ammonia-hydrogen bromide, iodide, and astatide complexes are shown to be stable, and one may perhaps bind an electron. The concept of the ammonium radical as a pseudo-atom is presented and tested. It is found to show competing pseudo-atomic and molecular properties.
Supervisor: Gutowski, Maciej Sponsor: Engineering and Physical Sciences Research Council (EPSRC)
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available