1. Contribution from the Laboratory of Macromolecular and Organic Chemistry, Biomodeling and Bioinformatics, Laboratory of Inorganic Chemistry and Catalysis, and Soft Matter CryoTEM Research Unit, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands, and Department of Materials Science and Technology, University of Crete and FORTH, P.O. Box 1527, 71110 Heraklion, Greece