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KMID : 1059519940380110792
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Journal of the Korean Chemical Society
1994 Volume.38 No. 11 p.792 ~ p.799
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Kinetic Studies of the Aggregation of 3,3'-Diethyl Oxacarbocyanine onto Polyacrylic Acid
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Lee Hong
Lim Eun-Suk
Pae Hyun-Ock
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Abstract
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The spectral changes of 3,3'-diethyl oxacarbocyanine(DOC) in the aqueous solution and in the presence of polyacrylic acid(PAA) were studied by means of absorption and fluorescence spectroscopy. The spectral change of DOC in the aqueous solution with concentration changes is attributed to the formation of dimer. In the presence of PAA, the characteristic changes of metachromatic band with changes of P/D (the ratio between available binding site and the dye concentration) are found and the discussions are made in terms of stacking theory. A kinetic study of the interaction between DOC and PAA was also investigated by the absorption and fluorescence stopped-flow spectroscopy. The observed relaxation effect in PAA-DOC system can be described quantitatively by assuming two relaxation processes occur.
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