کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1238199 | 968922 | 2006 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Charge transfer complex studies between some non-steroidal anti-inflammatory drugs and π-electron acceptors Charge transfer complex studies between some non-steroidal anti-inflammatory drugs and π-electron acceptors](/preview/png/1238199.png)
Charge transfer (CT) complexes of some non-steroidal anti-inflammatory drugs, naproxen and etodolac which are electron donors with some π-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 °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 ΔH, ΔS, ΔG° 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.
Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 65, Issue 5, December 2006, Pages 1120–1124