Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (06): 1059-1064.doi: 10.3866/PKU.WHXB20090529

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Preparation, Spectral Properties and Decomposition Behavior of a Novel β-Cyclodextrin and Sodium Arsenite Adduct Formed by Stirring

DANG Zheng, SONG Le-Xin, PAN Shu-Zhen. WANG Mang   

  1. Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
  • Received:2009-01-06 Revised:2009-02-18 Published:2009-06-05
  • Contact: SONG Le-Xin


We report on the formation of a molecule-ion adduct of β-cyclodextrin (β-CD) with sodium arsenite (SA) both in solid state and in aqueous solution. The adduct was characterized using Fourier transforminfrared spectroscopy, powder X-ray diffraction, differential thermogravimetric analysis, gas chromatography coupled to time-of-flight mass spectrometry, UV-Vis spectroscopy, 1H nuclear magnetic resonance titration and electrospray ionization mass spectroscopy. We found that a weak molecule-ion interaction was responsible for the difference in spectral properties in solid state and in aqueous solution as well as for the difference in thermal decomposition behavior between β-CD, SA and the adduct. The novelty and complexity of this interesting molecule-ion interaction was revealed by a redox reaction based on the data of gas chromatograph coupled to time-of-flight mass spectrometer and by the formation of the 1:1 (molar ratio) supramolecular ion complex, Na+-β-CD, based on its electrospray ionization mass spectrum.

Key words: β-Cyclodextrin, Sodium arsenite, Adduct, Molecule-ion interaction, Inorganic drug


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