Akademik Veri Yönetim Sistemi
1st International Balkan Chemistry Congress, Edirne, Türkiye, 17 - 20 Eylül 2018, ss.265
Metal-free and metallo phthalocyanine (Pc) compounds involving a conjugated 18-π electron system have
technological applicability in many areas due to their superior properties such as high thermal stability, chemical
resistance, high coloring property, semi-conductivity, photoconductivity and catalytic activity. While some of
these compounds display only Pc ring based reduction-oxidation processes, the others show central metal-based
redox processes [1]. While the electrochemical techniques such as cyclic voltammetry and controlled-potential
coulometry give important clues for identification of the nature of these processes, i.e., whether these reactions
are ligand or metal based, in situ spectroelectrochemical techniques provide additional support for this
identification.
In this study, the redox properties of a novel group of Pc compounds including 1,1'-Thiobis(2-naphtol) moieties
have been investigated in a suitable organic solvent environment with electrochemical techniques such as cyclic
voltammetry and square wave voltammetry. In addition, in order to determine the usability of Pc compounds as
electrochromic materials, in situspectroelectrochemical and electrocolorimeric measurements were carried out.
The compounds exhibited one-electron reversible or quasi -reversible metal and/or ligand based reduction and
oxidation processes, associated with the net colour changes.
One of the key tasks of current research on fuel cell and metal-air battery applications is the availability of
efficient, stable and low cost electrocatalysts that support the reduction of the oxygen molecule by four electrons.
Pc complexes are also receiving increasing attention in the field of fuel cells and metal air cells due to their high
electrocatalytic activity in oxygen reduction [2]. For this reason, the catalytic performances of the metal Pc
compounds in oxygen reduction were also tested by dynamic voltammetry using a rotating ring-disc electrodecouple potentiostat combined system in an environment similar to fuel cell operating conditions.
Fig.1. Molecular structure of the phthalocyanine compounds including 1,1'-Thiobis(2-naphtol) groups