1. School of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
2. Slovenian NMR Centre, National Institute of Chemistry, SI-1000 Ljubljana, Slovenia
3. Department of Inorganic Chemistry and Technology, National Institute of Chemistry, SI-1001 Ljubljana, Slovenia
4. Division of Biomedical Engineering, School of Engineering, University of Glasgow, Glasgow G12 8QQ, U.K.