Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (10): 1174-1177.doi: 10.3866/PKU.WHXB20051023

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Dual Inclusional Modes of β-cyclodextrin with Polyoxyethylene Lauryl Ether

DU Xin-zhen; SUN Yan-chun; ZHOU Rong; WANG Ya-rong; TAO Xiao-juan   

  1. Department of Chemistry, Northwest Normal University, Lanzhou 730070
  • Received:2005-02-24 Revised:2005-04-22 Published:2005-10-15
  • Contact: DU Xin-zhen E-mail:duxz@nwnu.edu.cn

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Abstract: Inclusion of β-cyclodextrin (β-CD) with polyoxyethylene lauryl ether (PL) was studied by surface tension, cloud point, color reaction and 1H NMR measurements. It was established that the inclusion of β-CD with PL affords supramolecular complexes with stoichiometric ratios of 2∶1 and 3∶1 in aqueous solution. Inclusion complex with the stoichiometry of 2∶1 arises from the incorporation of lauryl group of PL into the cavity of β-CD, whereas inclusion complex with the stoichiometry of 3∶1 arises from the incorporation of polyoxyethylene group of PL into the cavity of β-CD. A special configuration of the complex has been proposed based on experimental results and molecular sizes.

Key words: β-Cyclodextrin, PL, Surface tension, Cloud point, 1H NMR, Supramolecular inclusion complex