Article ID Journal Published Year Pages File Type
1238205 Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 2006 6 Pages PDF
Abstract

The charge transfer complex (CT-complex) between oxatomide drug and 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ) was studied spectrophotometrically in 10 solvents at different temperatures. The donor oxatomide is found to form stable 1:1 stoichiometric complex with DDQ and the stoichiometry was unaffected by change in polarity of the solvent studied. The ΔH°, ΔS° and ΔG° values are all negative, so the studied complex is reasonably stable and exothermic in nature. The ionization potential of the drug was determined using the CT-absorption bands of the complex in all the solvents. The dissociation energy of the charge transfer excited state for the CT-complex in different solvents was also determined and is found to be constant. The spectroscopic and thermodynamic properties were observed to be sensitive to the nature of the solvent.

Related Topics
Physical Sciences and Engineering Chemistry Analytical Chemistry
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