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4-N, N- DİMETİL AMİNO FENİL PROPAN VE TÜREVLERİNİN ELEKTROKİMYASAL DAVRANIŞI

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THE ELECTROCHEMICAL BEHAVIOURS OF 4-(N, N- DIMETHYL AMINO) PHENYL PROPENAL AND DERIVATIVES

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Sayfa Aralığı:: 
140-148

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Abstract (Original Language): 
Geniş bir pH Aralığında 4- ( N,N- Dimetilamino ) fenil propanol ve türevlerinin sulu ve susuz ortamda platin elektrotla redüksiyonu incelendi. Asidik ortamda iki redüksiyon piki, bazik ortamda bir redüksiyon pili oluşmakta ve her redüksiyon reaksiyonuna iki elektron eşlik etmektedir. Önce –C=C- bağı indirgenir, sonra aldehit grubu indirgenir. İndirgenme asidik ortamda iki basamakta gerçekleşir her basamakta bir elektron alır. Alkali ortamda, pH değerinin artmasıyla ilk elektronu alan radikal anyonun protonlaşma hızı azalır. Radikal anyonun redüksiyonu -1.5 V da gerçekleşir. Susuz ortamda bir pik görülmektedir. Reaksiyon mekanizmaları siklik voltmetre, kulonmetre, IR, kütle ve proton NMR spektroskopisi verilerine göre açıklandı.
Abstract (2. Language): 
4-(N, N- Dimethylamino) Phenyl Propenal and Derivatives have been studied over a wide pH range in aqueous and non-aqueous media using platinum foil electrode. Two reductions in acidic medium and one reduction in basic medium take place involving two electrons per reduction. In the first the C=C double bond is reduced, in the second the aldehyde group. In acid media, two-electron process is split into two one-electron steps. In alkaline media, when the rate of protonation of the radical anion formed in the uptake of the first electron decreases with increasing pH, the two electron reduction peak of 4-(N, N- Dimethyl amino) Phenyl propenal and derivatives decreases to one-electron peak, followed at –1.5V by another one-electron peak which corresponds to the radical anion reduction. In non-aqueous media, only one peak is seen. On the basis of linear and cyclic sweep voltammetry, coulometry, IR, Mass, and 1 H-NMR spectral studies and product identification a reaction mechanism are suggested to account for the reduction mechanism.

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