Electrochemistry of lutetium crowned ether diphthalocyanine films
1989; Elsevier BV; Volume: 271; Issue: 1-2 Linguagem: Inglês
10.1016/0022-0728(89)80073-7
ISSN2590-2954
AutoresM. Bardin, E. Bertounesque, V. Plichon, J. Simon, Vefa Ahsen, Özer Bekâroĝlu,
Tópico(s)Electrocatalysts for Energy Conversion
ResumoFilms of crown-ether substituted diphthalocyanine of lutetium (CR-Pc2Lu) have been studied by cyclic voltammetry. In contact with K+ or Na+ aqueous electrolyte, two reversible one-electron steps lead to the formation of the orange cation CR-Pc2Lu+ and to the blue anion CR-Pc2Lu−. With other alkali metal cations, the irreversibility of both steps increases in the order K+, Na+ ⪡ Li+ < Rb+, Cs+. In acid medium (HCl or HClO4), voltammetry cannot be performed in the absence of alkali cation added simultaneously to the solution, and destruction of the films occurs. In contact with a KCl + HCl or a KClO4 + HClO4 solution, disproportionation of CR-Pc2 Lu proceeds and a two-electron voltammetric peak takes the place of the two one-electron steps. A E-pH “Pourbaix” diagram is established.
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