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Complex formation of cucurbit[6]uril with amines in the presence of different salts

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Abstract

The complex formation of cucurbit[6]uril with cyclohexylmethylamine hydrochloride and hexylamine hydrochloride has been studied in aqueous solution using potentiometric titrations. The influence of salts like NaCl, KCl, RbCl, CsCl, BaCl2 and tetramethylammonium chloride and tetraethylammonium perchlorate on the complex formation with amines has been studied at different concentrations of these salts. With increasing salt concentration the stability constants for the complex formation with cyclohexylamine hydrochloride and hexylamine hydrochloride decreases. However, no specific influence is observable. These results show that 2:1 complexes between these salts and cucurbituril are not formed or that their concentration in solution is rather low.

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Authors and Affiliations

  1. Deutsches Textilforschungszentrum Nord-West e.V., Adlerstrasse 1, 47798, Krefeld, Germany

    Hans-Jürgen Buschmann & Eckhard Schollmeyer

  2. Department of Analytical Chemistry, University of Bucharest, 4-12 Blvd. Regina Elisabeta, 030018, Bucharest, Romania

    Lucia Mutihac

Authors
  1. Hans-Jürgen Buschmann
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  2. Lucia Mutihac
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  3. Eckhard Schollmeyer
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Correspondence to Hans-Jürgen Buschmann.

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Buschmann, HJ., Mutihac, L. & Schollmeyer, E. Complex formation of cucurbit[6]uril with amines in the presence of different salts. J Incl Phenom Macrocycl Chem 61, 343–346 (2008). https://doi.org/10.1007/s10847-008-9427-3

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  • DOI: https://doi.org/10.1007/s10847-008-9427-3

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