Dinuclear manganese complexes for water oxidation: evaluation of electronic effects and catalytic activity
2014 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 16, no 24, 11950-11964 p.Article in journal (Refereed) Published
During recent years significant progress has been made towards the realization of a sustainable and carbon-neutral energy economy. One promising approach is photochemical splitting of H2O into O-2 and solar fuels, such as H-2. However, the bottleneck in such artificial photosynthetic schemes is the H2O oxidation half reaction where more efficient catalysts are required that lower the kinetic barrier for this process. In particular catalysts based on earth-abundant metals are highly attractive compared to catalysts comprised of noble metals. We have now synthesized a library of dinuclear Mn-2 (II,III) catalysts for H2O oxidation and studied how the incorporation of different substituents affected the electronics and catalytic efficiency. It was found that the incorporation of a distal carboxyl group into the ligand scaffold resulted in a catalyst with increased catalytic activity, most likely because of the fact that the distal group is able to promote proton-coupled electron transfer (PCET) from the high-valent Mn species, thus facilitating O-O bond formation.
Place, publisher, year, edition, pages
2014. Vol. 16, no 24, 11950-11964 p.
IdentifiersURN: urn:nbn:se:su:diva-105948DOI: 10.1039/c3cp54800gISI: 000337122000015OAI: oai:DiVA.org:su-105948DiVA: diva2:733151
FunderKnut and Alice Wallenberg FoundationSwedish Research CouncilSwedish Energy Agency