1. Laboratory of Inorganic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
2. UCL Healthcare Biomagnetic and Nanomaterials Laboratories, 21 Albemarle Street, London W1S 4BS, United Kingdom
3. Biophysics Group, Department of Physics and Astronomy, University College London (UCL), London WC1E 6BT, United Kingdom