1. Department of Chemistry, University of Wales Swansea, Singleton Park, Swansea, SA2 8PP, UK, Department of Chemistry and Department of Physics, University of Aveiro, CICECO, 3810-193 Aveiro, Portugal, Department of Biochemistry, NMR Centre and Centre of Neurosciences and Cell Biology, University of Coimbra, 3001-401 Coimbra, Portugal, and AD Technology Consulting Limited, Swansea, SA2 8PP, UK