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Zeitschrift für Naturforschung B

A Journal of Chemical Sciences

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1865-7117
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Determination of the charge of Al13 Keggin oligocations intercalated into synthetic hectorite

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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/ Josef Breu
  • Corresponding author
  • Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
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Published Online: 2018-12-04 | DOI: https://doi.org/10.1515/znb-2018-0172

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.

This article offers supplementary material which is provided at the end of the article.

Keywords: Al-pillared clay; charge; hectorite; Keggin

Dedicated to: Professor Wolfgang Bensch on the occasion of his 65th birthday.

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About the article

Received: 2018-08-15

Accepted: 2018-10-26

Published Online: 2018-12-04


Citation Information: Zeitschrift für Naturforschung B, 20180172, ISSN (Online) 1865-7117, ISSN (Print) 0932-0776, DOI: https://doi.org/10.1515/znb-2018-0172.

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