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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