Adsorption of some functionalized aliphatic compounds on plasma-grown thin-film aluminium and magnesium oxides |
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| Institution: | 1. Water Quality and Investigations, Environmental Monitoring and Assessment Science, Science Division, The State of Queensland, Department of Environment and Science, Dutton Park, Queensland, Australia;2. School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland, Australia;3. School of Earth and Environmental Sciences, University of Queensland, Brisbane, Queensland, Australia;4. Centre for Agroecology, Water and Resilience, Coventry University, Coventry, West Midlands, United Kingdom;5. National Research Centre for Environmental Toxicology, University of Queensland, Robertson, Queensland, Australia;6. Australian Rivers Institute, Griffith University, Nathan, Queensland, Australia |
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| Abstract: | A study of the inelastic electron tunnelling (IET) spectra of N,N-diethyl-1,2-diaminoethane, N,N′-diethyl-1,2-diaminoethane, N,N′-dimethyl-1,2-diaminoethane, N,N,N′,N′-tetraethyl-1,2-diamino-ethane and N,N,N′,N′-tetramethyl-1,2-diaminoethane, shows all five systems to form five-membered chelate structures with both nitrogen atoms present in the adsorbate acting as Lewis donors at the same cation on either aluminium oxide or magnesium oxide. The IET spectra for the N-ethyl-2-aminoethanol, N,N-diethyl-2-aminoethanol and N,N-dimethyl-2-aminoethanol also examined indicate that similar alkoxy-amino chelated structures are formed with these adsorbates. For the aminoethanols adsorption—chelation appears to involve adsorbate deprotonation and hydroxyl depletion of the oxide surfaces involved with concomitant binding of the nitrogen atom present to the surface metal ion involved in alkoxide formation. |
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