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Interaction of dodecaborate cluster compounds on hydrophilic column materials in water
Department of Chemistry, University of Bremen AND School of Engineering and Science, Jacobs University Bremen, Germany.
Center for Environmental Research and Sustainable Technology, University of Bremen, Germany.
Center for Environmental Research and Sustainable Technology, University of Bremen, Germany.
Center for Environmental Research and Sustainable Technology, University of Bremen, Germany.
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2012 (English)In: Journal of Chromatography A, ISSN 0021-9673, E-ISSN 1873-3778, Vol. 1256, 98-104 p.Article in journal (Refereed) Published
Abstract [en]

The interaction of a series of dodecaborate cluster compounds B12X122− and B12X11Y2− (X = H, Cl, Br, I and Y = SH, OH, NR3) with hydrophilic column materials (Superdex 200, Sepharose 4B, Sephadex G-50, Sephadex G-100, alumina, silica gel and anion exchange material) was studied. Almost all the dodecaborate cluster compounds were retained strongly on Superdex 200. The halogenated cluster compounds interacted with Sepharose 4B, Sephadex G-50, Sephadex G-100 and alumina; on alumina, also the non-halogenated clusters were retained. Silica gel showed the least interaction with all compounds. The thermodynamic parameters were investigated for a selection of compounds on Superdex 200 and Sephadex G-100. Values for ΔH° were found to be negative on both gels. As the change in entropy ΔS° was also negative, it compensated ΔH° to a large extent. The clusters interacted also strongly with anion exchange material in ion chromatography; the interaction decreased with increasing acetonitrile concentration, implying a large contribution from solvent effects.

Place, publisher, year, edition, pages
2012. Vol. 1256, 98-104 p.
Keyword [en]
Liquid chromatography, Weakly coordinating ions, Sephadex, Superdex, Boron cluster, Thermodynamics
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-179862DOI: 10.1016/j.chroma.2012.07.055ISI: 000308624000013OAI: oai:DiVA.org:uu-179862DiVA: diva2:546827
Available from: 2012-08-24 Created: 2012-08-24 Last updated: 2017-12-07Bibliographically approved

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Edwards, Katarina

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