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Citation: SUN Yan, XIA Dao-Hong, XIANG Yu-Zhi. The Inclusion Stability Constants of β-Cyclodextrin with Various Mercaptans[J]. Chinese Journal of Applied Chemistry, ;2007, 24(6): 703-706. shu

The Inclusion Stability Constants of β-Cyclodextrin with Various Mercaptans

1.
College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Dongying 257061

Corresponding author: XIA Dao-Hong,
Received Date: 22 July 2006
Available Online: 28 September 2006

The competitive UV-Vis spectrophotometric method was performed in aqueous sodium carbonate and sodium bicarbonate buffer solution (pH=10.50,c=0.025 mol/L) at 30.0℃ to determine the inclusion of various mercaptan molecules by β-CD with phenolphthalein as a spectral probe.The results obtained indicate that β-CD could include different mercaptans to form the inclusion compounds.The inclusion stability constants of β-CD encapsulating 1-propanethiol,1-butanethiol,1-pentanethiol,1-hexanethiol,and 1-octanethiol were 28.71,66.39,127.8,186.2,and 651.1 L/mol,respectively,and the inclusion stability constants of β-CD encapsulating 2-methyl-1-propanethiol and 2-methyl-2-propanethiol were 364.6 and 641.9 L/mol,respectively.It was found that the inclusion ability of β-CD encapsulating normal mercaptans increases with the increase of the number of the carbon atom,and the inclusion ability of β-CD encapsulating isomercaptans increase with the increasing of the isomerization of mercaptans.The size matching between the host and the guest and the polarity of the guest have important effect on the inclusion.
- β-cyclodextrin,
- mercaptan,
- inclusion,
- stability constant
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