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• W3154598814 abstract "Abstract The cobalt substituted polyoxotungstate [Co 6 (H 2 O) 2 (α‐B‐PW 9 O 34 ) 2 (PW 6 O 26 )] 17− ( Co6 ) displays fast electron transfer (ET) kinetics to photogenerated Ru III (bpy) 3 3+ , 4 to 5 orders of magnitude faster than the corresponding ET observed for cobalt oxide nanoparticles. Mechanistic evidence has been acquired indicating that: (i) the one‐electron oxidation of Co6 involves Co(II) aquo or Co(II) hydroxo groups (abbreviated as Co6(II) −OH 2 and Co6(II) −OH, respectively, whose speciation in aqueous solution is associated to a pK a of 7.6), and generates a Co(III)−OH moiety ( Co6(III) −OH), as proven by transient absorption spectroscopy; (ii) at pH>pK a , the Co6(II) −OH→Ru III (bpy) 3 3+ ET occurs via bimolecular kinetics, with a rate constant k close to the diffusion limit and dependent on the ionic strength of the medium, consistent with reaction between charged species; (iii) at pH <pK a , the process involves Co6(II) − OH 2 → Co6(III)−OH transformation and proceeds via a multiple‐site, concerted proton electron transfer (CPET) where water assists the transfer of the proton, as proven by the absence of effect of buffer base concentrations on the rate of the ET and by a H/D kinetic isotope in a range of 1.2–1.4. The reactivity of water is ascribed to its organization on the surface of the polyanionic scaffold through hydrogen bond networking involving the Co(II)−OH 2 group." @default.
• W3154598814 created "2021-04-26" @default.
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• W3154598814 date "2021-05-11" @default.
• W3154598814 modified "2023-09-25" @default.
• W3154598814 title "Water‐Assisted Concerted Proton‐Electron Transfer at Co(II)‐Aquo Sites in Polyoxotungstates With Photogenerated Ru^III(bpy)₃³⁺ Oxidant" @default.
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• W3154598814 doi "https://doi.org/10.1002/cphc.202100190" @default.
• W3154598814 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8251842" @default.
• W3154598814 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33851772" @default.
• W3154598814 hasPublicationYear "2021" @default.
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