Interfacial behaviour of long-chain alkyl-pyrimidinium cations at the Hg/aqueous solution interface

✍ Scribed by A. Pappa-Louisi; P. Nikitas; Ph. Andonoglou; G. Kokkinidis; S. Pegiadou-Koemtjopoulou; E. Tsatsaroni

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 623 KB
• Volume: 39
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(94)85078-x

✦ Synopsis

The interracial micellization of a homologous series of N-alkyl pyrimidinium salts and their transformations on a Hg electrode are studied by means of differential capacitance measurements. It is shown that below the crnc a monolayer film of surface micelles is formed at positive polarizations, around +0.15 V with respect to the saturated calomel electrode, and covers the electrode surface up to -1.2 V where this film is destroyed due to the onset of a reduction of N-alkyl pyrimidinium cations. The product of this reduction is strongly adsorbed on the electrode surface and undergoes a surface phase transition forming a compact layer in the region between -1.3 and -1.7 V. At concentrations above the crac the picture is almost the same except the fact that in the polarization region from ca. + 0.2 to + 0.l V the micellar film collapses to a compact layer.