1. Department of Chemistry; Swansea University; Singleton Park Swansea SA2 8PP UK
2. Chemistry Group; College of Engineering, Swansea University; Singleton Park Swansea SA2 8PP UK
3. School of Chemistry and Physics; University of KwaZulu-Natal; Westville Campus Durban 4000 South Africa
4. Department of Geography; College of Science, Swansea University; Singleton Park Swansea SA2 8PP UK
5. School of Chemistry; Cardiff University; Park Place Cardiff CF10 3AT UK