title: Charge transfer complex studies between some non-steroidal anti-inflammatory drugs and pi-electron acceptors.
abstract: Charge transfer (CT) complexes of some non-steroidal anti-inflammatory drugs, naproxen and etodolac which are electron donors with some pi-acceptors, such as tetracyanoethylene (TCNE), 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ), p-chloranil (p-CHL), have been investigated spectrophotometrically in chloroform at 21 degrees C. The coloured products are measured spectrophotometrically at different wavelength depending on the electronic transition between donors and acceptors. Beer's law is obeyed and colours were produced in non-aqueous media. All complexes were stable at least 2 h except for etodolac with DDQ stable for 5 min. The equilibrium constants of the CT complexes were determined by the Benesi-Hildebrand equation. The thermodynamic parameters DeltaH, DeltaS, DeltaG degrees were calculated by Van't Hoff equation. Stochiometries of the complexes formed between donors and acceptors 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.
authors.affiliation: Sakarya University, Faculty of Arts and Sciences, Department of Chemistry, Sakarya 54100, Turkey.
authors.forename: Hulya
authors.initials: H
authors.lastname: Duymus
authors.forename: Mustafa
authors.initials: M
authors.lastname: Arslan
authors.forename: Mustafa
authors.initials: M
authors.lastname: Kucukislamoglu
authors.forename: Mustafa
authors.initials: M
authors.lastname: Zengin
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry*; D016227:Benzoquinones / Q000737:chemistry; D002703:Chloranil / Q000737:chemistry; D005030:Ethylenes / Q000737:chemistry; D017308:Etodolac / Q000737:chemistry*; D008954:Models, Biological; D009288:Naproxen / Q000737:chemistry*; D009570:Nitriles / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry*; D010084:Oxidation-Reduction; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D016227:Benzoquinones; D005030:Ethylenes; D009570:Nitriles; D016877:Oxidants; D002703:Chloranil; C000928:dichlorodicyanobenzoquinone; D017308:Etodolac; D009288:Naproxen; C003393:tetracyanoethylene