Inclusion complexes between cyclic siloxanes and cyclodextrins: synthesis and characterization

Abbato, Vincenzo; Bassindale, Alan R.; Brandstadt, Kurt F. and Taylor, Peter G. (2012). Inclusion complexes between cyclic siloxanes and cyclodextrins: synthesis and characterization. Journal of Inclusion Phenomena and Macrocyclic Chemistry, 74 pp. 223–230.

DOI: https://doi.org/10.1007/s10847-011-0103-7

Abstract

Molecular inclusion complexes between cyclodextrins and cyclic siloxanes were prepared and characterized via a combination of liquid and solid state NMR, FT-IR, TGA, powder X-ray diffraction, SEM–EDS and elemental analyses. The crystalline complexes adopted the channel-type conformation. Depending from the size of both the cyclic sugar cavity and the silicon guest, various yields (between 0 and 41%) and host–guest molar ratios (between 1:1 and 4:1) were obtained. α-cyclodextrin (α-CD) and β-cyclodextrin (β-CD) were observed to form crystalline inclusion complexes only with D3 (cyclic dimethyltrisiloxane) due to steric effects, whereas the larger γ-cyclodextrin (γ-CD) formed inclusion complexes both with D₃, D₄ (cyclic dimethyltetrasiloxane) and D₅ (cyclic dimethylpentasiloxane). This study is believed to be the first step towards the selective removal of cyclic siloxanes impurities from commercial PDMS preparations.

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About

• Item ORO ID
• 32431
• Item Type
• Journal Item
• ISSN
• 1573-1111
• Keywords
• cyclodextrin; cyclosiloxane; inclusion complex; channel-type
• Academic Unit or School
• Other Departments > Vice-Chancellor's Office
  Other Departments
  Faculty of Science, Technology, Engineering and Mathematics (STEM) > Life, Health and Chemical Sciences
  Faculty of Science, Technology, Engineering and Mathematics (STEM)
• Copyright Holders
• © 2012 Springer Science+Business Media B.V.
• Depositing User
• Peter Taylor