Abstract
Kinetics of the complex formation reaction of morpholine with 2,3-dichlro-5,6-dicyano-p-benzoquinone (DDQ) in chloroform, dichloromethane and acetonitrile solutions has been investigated spectrophotometrically at various temperatures. The observed time dependence of the CT band indicates the subsequent formation of electron donor–acceptor complex in solution. The increase and decrease in the absorbance is related to the formation and consumption of DDQ− radical ion. The pseudo-first-order rate constants at various temperatures for the formation of the ionic intermediate and the final product have been evaluated by computer fitting of the absorbance time data to appropriate equations. The activation parameters of the complexes have been determined from the temperature dependence of kinetic constants by Eyring equation. The influence of solvent properties on the kinetics of the resulting proton-transfer complexes is discussed.
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