Spectroscopic Study of the Complexation of DDQ with 1,10-Diaza-18-crown-6 in Chloroform Solution |
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Authors: | MASOUMEH HASANI MOJTABA SHAMSIPUR |
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Affiliation: | (1) Department of Chemistry, Shiraz University, Shiraz, Iran;(2) Department of Chemistry, Razi University, Kermanshah, Iran |
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Abstract: | The formation of charge transfer complexes with 1:1 and 2:1 stoichiometries (acceptor-to-donor) between DDQ and 1,10-diaza-18-crown-6 in chloroform solution was investigated spectrophotometrically. The stepwise formation constants of the resulting complexes were evaluated from the non-linear least-squaresfitting of the absorbance-mole ratio data. The enthalpies and entropiesof the complexation reactions were determined from the temperature dependence of the stepwise formation constants. The resulting 1:1 and 2:1 complexes were isolated in crystalline form and characterized. The results are consistent with the ionic structure of the resulting charge transfer complexes. |
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Keywords: | Diaza-18-crown-6 DDQ charge transfer complexes spectrophotometry IR NMR |
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