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