Interactions of Tetrakis(4-sulfonatophenyl)porphyrin with γ-Cyclodextrin and Alkyltrimethylammonium Bromides in Aqueous Solutions |
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Authors: | Sanyo Hamai Yasuhiro Sasaki Takahiro Hori Aiko Takahashi |
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Institution: | (1) Department of Chemistry, Faculty of Education and Human Studies, Akita University, Tegata Gakuen-machi 1-1, 010-8502 Akita, Japan |
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Abstract: | Tetrakis(4-sulfonatophenyl)porphyrin (TSPP) forms complexes with octyltrimethylammonium bromide (OTMA) and hexyltrimethylammonium
bromide (HTMA) in pH 7.3 buffers. At low concentrations of OTMA (HTMA), a 1:1 TSPP–OTMA complex is formed. As the OTMA (HTMA)
concentration is increased, a 1:2 TSPP–OTMA (HTMA) complex is also formed. The equilibrium constants for the formation of
the TSPP–OTMA (HTMA) complexes have been evaluated from a simulation of the observed fluorescence intensity data. In the induced
circular dichroism spectrum, the signal intensity of TSPP in aqueous solutions containing both γ-CD and OTMA has been similar
to that containing only γ-CD, suggesting the formation of the 1:1:1 γ-CD–TSPP–OTMA (HTMA) inclusion complex. Capillary electrophoretic
study has exhibited the formation of the 1:1 TSPP–OTMA (HTMA) complex, although the 1:2 TSPP–OTMA (HTMA) complex could not
be observed, probably because the OTMA (HTMA) concentration used was low. The equilibrium constants for these 1:1 complexes
have been evaluated from the variation in the electrophoretic mobility. The equilibrium constant for the formation of the
1:1:1 γ-CD–TSPP–OTMA or γ-CD–TSPP–HTMA complex has been evaluated from a simulation of the electrophoretic mobility change
in TSPP solution containing γ-CD and OTMA or HTMA, although the equilibrium constants for the ternary inclusion complexes
could not be evaluated using the fluorescence method due to the small fluorescence intensity change. |
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Keywords: | capillary electrophoresis γ -cyclodextrin electronic absorption fluorescence hexyltrimethylammonium bromide inclusion complexes octyltrimethylammonium bromide tetrakis (4-sulfonatophenyl)porphyrin |
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