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Spectroscopic Study of the Complexation of DDQ with 1,10-Diaza-18-crown-6 in Chloroform Solution
Authors:MASOUMEH HASANI  MOJTABA SHAMSIPUR
Affiliation:(1) Department of Chemistry, Shiraz University, Shiraz, Iran;(2) Department of Chemistry, Razi University, Kermanshah, Iran
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.
Keywords:Diaza-18-crown-6  DDQ  charge transfer complexes  spectrophotometry  IR  NMR
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