Artículo
Effect of Keggin polyoxometalate on Cu(ii) speciation and its role in the assembly of Cu3(BTC)2 metal-organic framework
Bajpe, Sneha R.; Breynaert, Eric; Mustafa, Danilo; Jobbagy, Matias
; Maes, André; Martens, Johan A.; Kirschhock, Christine E. A.
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Fecha de publicación:
07/2011
Editorial:
Royal Society of Chemistry
Revista:
Journal Of Materials Chemistry
ISSN:
0959-9428
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
HKUST-1 is one of the popular metal-organic frameworks (MOFs). The formation of this MOF is significantly accelerated by adding Keggin polyoxometalate anions to the synthesis solution. In this paper the chemistry behind this observation was investigated. Upon addition of Keggin type H 3PW12O40 heteropolyacid the speciation of Cu2+ cations in ethanol:H2O mixture drastically changes. Combining EPR and XANES measurements with accurate pH measurements and prediction of Cu2+ hydrolysis provides strong evidence for surface induced hydrolysis and consequent dimerisation of monomeric Cu2+ species on Keggin ions in acidic conditions. This enables paddle wheel formation, hence explaining the instantaneous precipitation of Cu 3(BTC)2 at room temperature and the systematic encapsulation of Keggin ions in its pores.
Palabras clave:
Metal Organic Framework
,
Mechanism
,
Crystal Growth
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Articulos(INQUIMAE)
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Articulos de INST.D/QUIM FIS D/L MATERIALES MEDIOAMB Y ENERGIA
Citación
Bajpe, Sneha R.; Breynaert, Eric; Mustafa, Danilo; Jobbagy, Matias; Maes, André; et al.; Effect of Keggin polyoxometalate on Cu(ii) speciation and its role in the assembly of Cu3(BTC)2 metal-organic framework; Royal Society of Chemistry; Journal Of Materials Chemistry; 21; 26; 7-2011; 9768-9771
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