Acta Phys. -Chim. Sin. ›› 1999, Vol. 15 ›› Issue (09): 856-859.doi: 10.3866/PKU.WHXB19990916

• Note • Previous Articles     Next Articles

Circular Dichroism and Molecular Conformation of Cyclodextrins Bearing Benzoyl Moiety

Zhang Yan-Ling, Gao Xing-Ming, Tong Lin-Hui, Ma Xue-Yi   

  1. Department of Chemistry,Lanzhou University,Lanzhou 730000|Department of Chemistry,Peking University,Beijing 100871|Lanzhou Institute of Chenical Physics,Chinese Academy of Science,Lanzhou 730000
  • Received:1998-11-03 Revised:1999-03-09 Online:1999-09-15 Published:1999-09-15
  • Contact: Ma Xue-Yi

Abstract:

The molecular conformation of cyclodextrins (β-CD, γ-CD) bearing benzoyl moiety was studied by circular dichroism and 1H NMR. The circular dichroism intensity of mono[6 (benzoyl-ethylendiamino)]-β-CD (1) was reduced by adding of guests. In contrast, the circular dichroism intensity of mono(6-o-benzoyl)-γ-CD (2) was increased by adding of guests. The benzoyl moiety of 1 was extruded outside from the cavity of β-CD by guests, while the benzoyl moiety of 2 was included together with guests in the cavity of γ-CD.

Key words: Benzoated cyclodextrins, Circular dichroism, Host conformation, Supramolecular chemistry