Determination of the charge of Al13 Keggin oligocations intercalated into synthetic hectorite

Marius Schöttle 1 , Dominik Schuchardt 1 , Andreas Edenharter 1 , Sebastian Koch 1 , Jürgen Senker 2 ,  and Josef Breu 1
  • 1 Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
  • 2 Inorganic Chemistry III and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
Marius Schöttle
  • Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
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, Dominik Schuchardt
  • Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
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, Andreas Edenharter
  • Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
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, Sebastian Koch
  • Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
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, Jürgen Senker
  • Inorganic Chemistry III and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
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and Josef Breu
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  • Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
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Abstract

Applying a nematic liquid crystalline phase of a synthetic Na-hectorite with layer separations >100 nm, the reaction time for pillaring with Al13 Keggin oligocation could be reduced to seconds ensuring that cation exchange is controlled by thermodynamics. With this material at hand we are able to resolve the long-standing dispute regarding the charge of intercalated Keggin oligocations. Micropore sizes as determined by physisorption isotherms, adsorption isotherms obtained via elemental analysis, and results of 27Al solid-state NMR and pyridine probe IR spectroscopy favor a charge of +7 for the Al13 pillars intercalated into hectorite unaltered.

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Zeitschrift für Naturforschung B is an international scientific journal which publishes original papers, microreviews, and letters from all areas of inorganic chemistry, solid state chemistry, coordination chemistry, molecular chemistry, and organic chemistry.

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