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KMID : 1059519850290060575
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Journal of the Korean Chemical Society
1985 Volume.29 No. 6 p.575 ~ p.581
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Thermodynamics of the Formation of Polynuclear Aromatics-Iodine Charge Transfer Complexes
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Kwun Oh-Cheun
Kim Jeong-Rim
Lee Young-Hoon
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Abstract
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Ultraviolet spectrophotometric investigations have been carried out on the systems of benzene, naphthalene and phenanthrene with iodine in carbon tetrachloride. The results reveal the formation of the one to one molecular complexes. The equilibrium constants were obtained in consideration of that absorption maxima due to the formation of the charge transfer complexes shift to blue with increasing temperature. Thermodynamic parameters for the formation of the charge transfer complexes were calculated from these values. These results indicate that the stabilities of the complexes formed between polynuclear aromatics and iodine increase with the number of aromatic rings. This may be a measure of the relative basicities of polynuclear aromatics toward iodine, which is explained in terms of the resonance of the interaction between aromatics and iodine. The results in this study were, additionally, compared with those of the polymethylbenzene series to be discussed the reason for them.
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