Algerian Journal of Engineering Research
Volume 1, Numéro 2, Pages 24-29
2017-12-01
Spectrophotometric Studies Of Charge Transfer Complexes Of 2, 3- Dichloro 5, 6-dicyano-p-benzoquinone As π-acceptor
Authors : Hanane Messiad .
Abstract
Charge transfer (CT) complexes formed between N-Sulfamoyloxazolidinones as donor, and 2, 3-Dichloro 5, 6- Dicyano-P-Benzoquinone (DDQ) as acceptor have been studied by UV-Vis Spectrophotometric method in chloroform medium. Benesi-Hildebrand and Job continuous variation methods were applied to the determination of formation constant (KTC) and molar extinction coefficient (εTC).The ionization potential of donor (IP) was calculated from the complex band energy using the CT transition energy. Oscillatorstrength and transition dipole moment of the abovementioned CT complexes indicatethat polar environmentfacilitate the extent of CT between the donor and the acceptor. The thermodynamic parameters (∆Н0,∆Ѕ0,∆G0) were calculated by Van’t Hoff equation. Stoechiometry of the complexes formed between donors and acceptor were defined by the Job’s method of the continuous variation and found in 1:1 complexation with donor and acceptor at the maximum absorption bands in all cases.
Keywords
CT complex; UV-Visible spectrophotometry; Π-acceptors; Benesi-Hildebrand equation; Thermodynamic parameters.
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