A synthetic manganese-calcium cluster similar to the catalyst of Photosystem II: challenges for biomimetic water oxidation.
Younes MousazadeMohammad Reza MohammadiRobabeh BagheriRahman BikasPetko ChernevZhenlun SongTadeusz LisMilosz SiczekNader NoshiranzadehStefan MebsHolger DauIvelina ZaharievaMohammad Mahdi NajafpourPublished in: Dalton transactions (Cambridge, England : 2003) (2020)
Herein, we report the synthesis, characterization, crystal structure, density functional theory calculations, and water-oxidizing activity of a pivalate Mn-Ca cluster. All of the manganese atoms in the cluster are Mn(iv) ions and have a distorted MnO6 octahedral geometry. Three Mn(iv) ions together with a Ca(ii) ion and four-oxido groups form a cubic Mn3CaO4 unit which is similar to the Mn3CaO4 cluster in the water-oxidizing complex of Photosystem II. Using scanning electron microscopy, transmission electron microscopy, energy dispersive spectrometry, extended X-ray absorption spectroscopy, chronoamperometry, and electrochemical methods, a conversion into nano-sized Mn-oxide is observed for the cluster in the water-oxidation reaction.
Keyphrases
- electron microscopy
- room temperature
- density functional theory
- metal organic framework
- transition metal
- high resolution
- ionic liquid
- crystal structure
- electron transfer
- molecular dynamics
- quantum dots
- solid phase extraction
- gold nanoparticles
- nitric oxide
- mass spectrometry
- single molecule
- computed tomography
- highly efficient
- carbon dioxide
- reduced graphene oxide
- dual energy
- label free