Photochemical Water Splitting at Soft Interfaces

• Antragsteller: Professor Dr. Burkhard König
• Fachliche Zuordnung: Organische Molekülchemie - Synthese, Charakterisierung ; Anorganische Molekülchemie - Synthese, Charakterisierung
• Förderung: Förderung von 2013 bis 2017
• Projektkennung: Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 232235263

• Erstellungsjahr: 2017

Zusammenfassung der Projektergebnisse

The immobilization of amphiphilic ruthenium complexes as sensitizer and water oxidation catalyst into the lipid membrane of vesicles enhances their cooperative catalytic performance. The higher local concentration and close proximity, in comparison to homogeneous solution, of the co-embedded complexes allows the photocatalytic water oxidation at nanomolar catalyst concentrations. Using the same concept, photosensitizer and dihydrogen evolution catalyst were membrane co-embedded. The fluidity of the membrane affects the cooperative catalytic performance. Absorption of sensitizing and oxidation or reduction catalysts to lipid-water interfaces leads to similar effects and is an even simpler strategy to enhance cooperative catalysis. The photostability of the sensitizer molecules is unfortunately not increased by the membrane embedding, but the use of semiconductor quantum dots as sensitizers gave functionalized vesicles with photocatalytic activity over 70 h.

Projektbezogene Publikationen (Auswahl)

• Chem. Eur. J. 2014, 20, 14570 - 14574: Functionalized Membranes for Photocatalytic Hydrogen Production
  S. Troppmann, B. König
  
• Chem. Sci. 2014, 5, 2683 - 2687: Photocatalytic water oxidation at soft interfaces
  M. Hansen, F. Li, L. Sun, B. König
  
• , Eur. J. Inorg. Chem. 2016, 554–560: Enhanced Photocatalytic Hydrogen Production by Adsorption of an [FeFe]-Hydrogenase Subunit Mimic on Self-Assembled Membranes
  S. Troppmann, E. Brandes, H. Motschmann, F. Li, M. Wang, L. Sun, B. König
  
• Chem. Eur. J. 2016, 22, 58 – 72: Artificial Photosynthesis at Dynamic Self-Assembled Interfaces in Water
  M. Hansen, S. Troppmann, B. König
  
• ChemistrySelect 2016, 1, 1405 – 1409: Functionalized Vesicles with Co-Embedded CdSe Quantum Dots and [FeFe]-Hydrogenase Mimic for Light-Driven Hydrogen Production
  S. Troppmann, B. König
  
• RSC Adv. 2016, 6, 41947 - 41950: Light Upconverting soft particles: Triplet-triplet annihilation in the phospholipid bilayer of selfassembled vesicles
  M. Poznik, U. Faltermeier, B. Dick, B. König
  
• RSC Adv. 2016, 6, 5739-5744: Immobilisation of Water‐oxidising Amphiphilic Ruthenium Complexes on Unmodified Silica Gel
  A. Králík, M. Hansen, B. König