Intermolecular Complexation Between p-Sulfonated Calix[4,6,8]arene Sodium and Neutral Red |
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Authors: | M Chen G W Diao |
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Institution: | (1) Department of Chemistry, Shanghai University, 200444 Shanghai, People’s Republic of China |
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Abstract: | The inclusion complexation behavior of the dye guest molecule neutral red with three kinds of water-soluble p-sulfonated calixn]arene sodium (n=4,6,8) was investigated. p-Sulfonated calix4,6,8]arene sodium (pSC4, pSC6, pSC8) can react with neutral red to form inclusion
complexes, which were confirmed by UV-vis absorption and fluorescence spectroscopy. Fluorescence spectroscopy experiments
were performed in pH=4.6 acetic buffer solutions at 25 °C to calculate the stability constants (K
S) for the stoichiometric 1:1 inclusion complexes of pSC4, pSC6 and pSC8 with neutral red. The thermodynamic parameters for
the inclusion complexes were determined through a van’t Hoff analysis. Formation of the inclusion complexes of pSC4, pSC6
and pSC8 with neutral red was driven by favorable enthalpic changes with their accompanying negative entropy changes. The
complex stability constants monotonically increased with the number of phenolic units in the calixarene ring, which was attributed
mainly to electrostatic interactions and hydrogen bonding, rather than to the cavity size. |
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Keywords: | |
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