title: Spectroscopic studies of charge transfer complexes between colchicine and some pi acceptors.
abstract: Charge transfer complexes between colchicine as donor and pi acceptors such as tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), p-chloranil (p-CHL) have been studied spectrophotometrically in dichloromethane at 21 degrees C. The stoichiometry of the complexes was found to be 1:1 ratio by the Job method between donor and acceptors with the maximum absorption band at a wavelength of 535, 585 and 515 nm. The equilibrium constant and thermodynamic parameters of the complexes were determined by Benesi-Hildebrand and van't Hoff equations. Colchicine in pure form and in dosage form was applied in this study. The formation constants for the complexes were shown to be dependent on the structure of the electron acceptors used.
authors.affiliation: Sakarya University, Faculty of Arts and Sciences, Chemistry Department, Sakarya 54140, Turkey. marslan@sakarya.edu.tr
authors.forename: Mustafa
authors.initials: M
authors.lastname: Arslan
authors.forename: Hulya
authors.initials: H
authors.lastname: Duymus
mesh_terms: D016227:Benzoquinones / Q000737:chemistry*; D002703:Chloranil / Q000737:chemistry*; D003078:Colchicine / Q000737:chemistry*; D005030:Ethylenes / Q000737:chemistry*; D008752:Methylene Chloride / Q000737:chemistry; D015394:Molecular Structure; D009570:Nitriles / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013053:Spectrophotometry; D013696:Temperature; D013816:Thermodynamics
chemical_list: D016227:Benzoquinones; D005030:Ethylenes; D009570:Nitriles; D012997:Solvents; D002703:Chloranil; D008752:Methylene Chloride; C003393:tetracyanoethylene; D003078:Colchicine