Rates of water exchange for two cobalt(II) heteropolyoxotungstate compounds in aqueous solution

Christian Andre Ohlin, Steven Harley, Gregory McAlpin, Rosalie Hocking, Brandon Mercado, Rene Johnson, Eric Villa, Mary Kate Fidler, Marilyn Olmstead, Leone Spiccia, R Britt, William Casey

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Polyoxometalate ions are used as ligands in water-oxidation processes related to solar energy production. An important step in these reactions is the association and dissociation of water from the catalytic sites, the rates of which are unknown. Here we report the exchange rates of water ligated to CoII atoms in two polyoxotungstate sandwich molecules using the 17O-NMR-based Swifta??Connick method. The compounds were the [Co4(H2O)2(B--PW9O34)2]10a?? and the larger I?I?-[Co4(H2O)2(P2W15O56)2]16a?? ions, each with two water molecules bound trans to one another in a CoII sandwich between the tungstate ligands.
Original languageEnglish
Pages (from-to)4408 - 4417
Number of pages10
JournalChemistry - A European Journal
Issue number16
Publication statusPublished - 2011

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