Sectroscopic study of stability and molecular species of 12-tungstophosphoric acid in aqueous solution
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2008
Authors
Holclajtner-Antunović, IvankaBajuk-Bogdanović, Danica
Todorović, Marija R.
Mioč, Ubavka B.
Zakrzewska, Joanna
Uskoković-Marković, Snežana
Article (Published version)
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The various molecular species of 12-tungstophosporic acid (WPA) in aqueous solutions of different pH values (from 1 to 11.5) were investigated by UV, IR, and NMR spectroscopy. The dependence of the attained equilibrium composition in solution on time, concentration of WPA, and type of buffer used was studied. Obtained results indicate that the buffer type and pH value greatly determine the equilibrium composition in the solution. The Keggin structure of the WPA is sustained only up to pH 1.5. With further increase in pH, the decomposition of Keggin anion does not lead directly to the monovacant lacunary anion. Between 1.5 and 2.0. the structures with 2 phosphorus atoms from the Dawson series are dominant as intermediate species. In the pH range 3.5-7.5, WPA is present in the form of the monovacant lacunary Keggin anion. These results are of special importance for the biomedical and catalytic applications of heteropoly compounds (HPCs) and for an improved understanding of the mechanism ...of their functioning.
Keywords:
heteropolyacids of the Keggin structure / hydrostability / UV / IR and NMR spectroscopySource:
Canadian Journal of Chemistry, 2008, 86, 10, 996-1004Publisher:
- Canadian Science Publishing, Nrc Research Press, Ottawa
Funding / projects:
- Struktura, termodinamičke i elektrohemijske osobine materijala za konverziju energije i nove tehnologije (RS-MESTD-MPN2006-2010-142047)
DOI: 10.1139/V08-138
ISSN: 0008-4042
WoS: 000260465900009
Scopus: 2-s2.0-54549106704
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PharmacyTY - JOUR AU - Holclajtner-Antunović, Ivanka AU - Bajuk-Bogdanović, Danica AU - Todorović, Marija R. AU - Mioč, Ubavka B. AU - Zakrzewska, Joanna AU - Uskoković-Marković, Snežana PY - 2008 UR - https://farfar.pharmacy.bg.ac.rs/handle/123456789/1031 AB - The various molecular species of 12-tungstophosporic acid (WPA) in aqueous solutions of different pH values (from 1 to 11.5) were investigated by UV, IR, and NMR spectroscopy. The dependence of the attained equilibrium composition in solution on time, concentration of WPA, and type of buffer used was studied. Obtained results indicate that the buffer type and pH value greatly determine the equilibrium composition in the solution. The Keggin structure of the WPA is sustained only up to pH 1.5. With further increase in pH, the decomposition of Keggin anion does not lead directly to the monovacant lacunary anion. Between 1.5 and 2.0. the structures with 2 phosphorus atoms from the Dawson series are dominant as intermediate species. In the pH range 3.5-7.5, WPA is present in the form of the monovacant lacunary Keggin anion. These results are of special importance for the biomedical and catalytic applications of heteropoly compounds (HPCs) and for an improved understanding of the mechanism of their functioning. PB - Canadian Science Publishing, Nrc Research Press, Ottawa T2 - Canadian Journal of Chemistry T1 - Sectroscopic study of stability and molecular species of 12-tungstophosphoric acid in aqueous solution VL - 86 IS - 10 SP - 996 EP - 1004 DO - 10.1139/V08-138 ER -
@article{ author = "Holclajtner-Antunović, Ivanka and Bajuk-Bogdanović, Danica and Todorović, Marija R. and Mioč, Ubavka B. and Zakrzewska, Joanna and Uskoković-Marković, Snežana", year = "2008", abstract = "The various molecular species of 12-tungstophosporic acid (WPA) in aqueous solutions of different pH values (from 1 to 11.5) were investigated by UV, IR, and NMR spectroscopy. The dependence of the attained equilibrium composition in solution on time, concentration of WPA, and type of buffer used was studied. Obtained results indicate that the buffer type and pH value greatly determine the equilibrium composition in the solution. The Keggin structure of the WPA is sustained only up to pH 1.5. With further increase in pH, the decomposition of Keggin anion does not lead directly to the monovacant lacunary anion. Between 1.5 and 2.0. the structures with 2 phosphorus atoms from the Dawson series are dominant as intermediate species. In the pH range 3.5-7.5, WPA is present in the form of the monovacant lacunary Keggin anion. These results are of special importance for the biomedical and catalytic applications of heteropoly compounds (HPCs) and for an improved understanding of the mechanism of their functioning.", publisher = "Canadian Science Publishing, Nrc Research Press, Ottawa", journal = "Canadian Journal of Chemistry", title = "Sectroscopic study of stability and molecular species of 12-tungstophosphoric acid in aqueous solution", volume = "86", number = "10", pages = "996-1004", doi = "10.1139/V08-138" }
Holclajtner-Antunović, I., Bajuk-Bogdanović, D., Todorović, M. R., Mioč, U. B., Zakrzewska, J.,& Uskoković-Marković, S.. (2008). Sectroscopic study of stability and molecular species of 12-tungstophosphoric acid in aqueous solution. in Canadian Journal of Chemistry Canadian Science Publishing, Nrc Research Press, Ottawa., 86(10), 996-1004. https://doi.org/10.1139/V08-138
Holclajtner-Antunović I, Bajuk-Bogdanović D, Todorović MR, Mioč UB, Zakrzewska J, Uskoković-Marković S. Sectroscopic study of stability and molecular species of 12-tungstophosphoric acid in aqueous solution. in Canadian Journal of Chemistry. 2008;86(10):996-1004. doi:10.1139/V08-138 .
Holclajtner-Antunović, Ivanka, Bajuk-Bogdanović, Danica, Todorović, Marija R., Mioč, Ubavka B., Zakrzewska, Joanna, Uskoković-Marković, Snežana, "Sectroscopic study of stability and molecular species of 12-tungstophosphoric acid in aqueous solution" in Canadian Journal of Chemistry, 86, no. 10 (2008):996-1004, https://doi.org/10.1139/V08-138 . .