Electrochemical and spectroelectrochemical characterization of the phthalocyanines with pentafluorobenzyloxy substituents |
| |
Authors: | At?f Koca,Ali R?za Ö zkaya,Mukaddes Selç uko?lu |
| |
Affiliation: | a Chemical Engineering Department, Engineering Faculty, Marmara University, 34722 Göztepe, Istanbul, Turkey b Department of Chemistry, Faculty of Science and Letters, Marmara University, 34722 Göztepe, Istanbul, Turkey c Department of Chemistry, Technical University of Istanbul, TR34469 Maslak, Istanbul, Turkey |
| |
Abstract: | The solution redox properties and spectroelectrochemical investigation of the novel metal-free, zinc, nickel and cobalt phthalocyanines with tetra-pentafluorobenzyloxy substituents at the periphery were studied using various electrochemical and spectroelectrochemical measurements. Cyclic voltammetry and differential pulse voltammetry studies show that while Ni(II), Zn(II) and free-phthalocyanines give up to two reduction and two oxidation processes having ligand-based diffusion controlled reversible one-electron electron transfer characters, Co(II) phthalocyanine represents one ligand-based oxidation, one metal-based reduction and one ligand-based reduction processes having diffusion controlled reversible one-electron transfer characters. Assignments of the redox couples are also confirmed by spectroelectrochemical measurements. Reduction potentials of all complexes shift to positive potentials due to the electron withdrawing tetra-pentafluorobenzyloxy substituents compared with those of the phthalocyanines bearing phenoxy derivatives. A linear variation of the first reduction and oxidation potentials versus ze/r has been obtained for zinc and nickel phthalocyanines. |
| |
Keywords: | Phthalocyanine Cyclic voltammetry Spectroelectrochemistry Cobalt |
本文献已被 ScienceDirect 等数据库收录! |
|