Oxidative dissolution of synthetic vivianites as a method for the crystallization of molecular structural motifs

 

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Detalles Bibliográficos
Autores: Rojas Gatjen, Esteban, Viales Montero, Christian, Urcuyo Solórzano, Roberto, González Flores, Diego, Montero Villalobos, Mavis Lili
Formato: artículo original
Fecha de Publicación:2021
Descripción:Isolation of structural motifs from minerals can be used to improve the understanding of fundamental processes such as catalytic mechanisms and spectroscopic vibrations. In this study, we designed an oxidative dissolution reaction using 2,2′-bipyridine in combination with minerals from the vivianite family. Vivianites are structurally similar to amorphous cobalt oxide water oxidation catalysts (CoCat). Specifically, we used pakhomovskyite (Pak: Co3(PO4)2•8H2O) and erythrite (Ery: Co3(AsO4)2•8H2O)). Through the designed synthetic route, we crystallized two mononuclear isostructural complexes containing phosphate or arsenate and a cobalt-arsenate trinuclear cluster. We observed three main binding modes from the anions: (i) both arsenates or phosphates bind to cobalt forming an O-μ2-bridge, (ii) arsenate forms a bridge between two cobalt atoms, and (iii) arsenate binds between three cobalt atoms expanding its coordination sphere to five. This structural information allows us to propose an updated structural model for amorphous cobalt oxide catalysts containing arsenate.
País:Kérwá
Institución:Universidad de Costa Rica
Repositorio:Kérwá
OAI Identifier:oai:kerwa.ucr.ac.cr:10669/86051
Acceso en línea:https://link.springer.com/article/10.1007/s11224-020-01644-3
https://hdl.handle.net/10669/86051
Palabra clave:Oxidative dissolution
Molecular motif
Cobalt oxide catalysts
Pakhomovskyite
Erythrite