Synthesis, electro-spectroelectrochemical characterization and electrocatalytic behavior towards dioxygen reduction of a new water-soluble cobalt phthalocyanine containing naphthoxy-4-sulfonic acid sodium salt

Electropolymerization of Phthalocyanines

“…The Pc ring is 1.2 nm in diameter [5,6], which makes immobilization of its anionic derivatives possible. Four-substituted Pc derivatives containing sulfoand naphthoxysulfo-groups ( Figure 6.1, compounds 1 and 2, respectively) are used for the synthesis of PANI [7][8][9][10]. Both substituents provide high solubility of Pc in water within wide pH range, including acidic media required for the synthesis of PANI.…”

“…PANI modified with anionic Pcs was synthesized by anodic polymerization of monomer from the 0.1-1 M sulfuric acid solutions in the presence of anionic Pc (10 −3 M) [7][8][9][10]. Despite the large excess of sulfuric acid, Pc anions were incorporated in the polymer.…”

“…Despite the large excess of sulfuric acid, Pc anions were incorporated in the polymer. This points to a strong interaction between the positively charged polymeric chains and these four-charged anions of Pcs [7,9,10]. As a result of such interaction, anionic Pc catalyzes electrochemical synthesis of PANI.…”

“…As a result of such interaction, anionic Pc catalyzes electrochemical synthesis of PANI. For instance, in the presence of CoTNhtPc, the rate of potentiodynamic synthesis of PANI is twice higher [10].…”

“…Metallic tetra sulphophthalocyanines (MTSPcs) of iron group metals (Fe, Co, Ni) [7][8][9][10][11] and copper [12] were investigated as electroactive compounds immobilized in PANI by various physicochemical methods including electron absorbance spectroscopy [10], elemental analysis [11], quartz microbalance [11,12], and so on. The results of these investigations reliably proved the fact of entrapment of MTSPcs in the PANI matrix.…”