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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