1. New Energies, Renewable Energies and Material Science Research Center Eni SpA 28100 Novara Italy
2. Istituto per la Sintesi Organica e la Fotoreattività (ISOF) Consiglio Nazionale delle Ricerche (CNR) 40129 Bologna Italy
3. Department of Chemistry and INSTM Research Unit University of Pavia 27100 Pavia Italy
4. Department of Chemistry, the Center for Light Energy Activated Redox Processes (LEAP), and the Materials Research Center (MRC) Northwestern University Evanston IL 60208 USA