New Octa-Benzothiazole Substituted Metal Free and Metallophthalocyanines: Synthesis, Characterization and Electrochemical Studies

Chemistry, 61080 Trabzon, Turkey Abstract The synthesis of novel phthalonitrile ( 3 ) and synthesis, spectroscopic and electrochemical properties of the following octa-benzothiazole substituted metal-free ( 4 ), cobalt(II) ( 5 ), and zinc(II) ( 6 ) phthalocyanines are reported for the first time in this work. The novel phthalonitrile ( 3 ) has been characterized by FT-IR, 1 H NMR, 13 C NMR, and mass spectroscopy and the novel phthalocyanines ( 4-6 ) have been characterized by FT-IR, electronic spectroscopy, and mass spectroscopy. Voltammetric analysis of benzothiazole group substituted phthalocyanines (MPc) were determined by cyclic voltammetry (CV) and square wave voltammetry (SWV). According to the results, phthalocyanines revealed metal and ligand-based quasi-reversible reduction and oxidation processes. While the CoPc 5 showed one metal-based and one Pc-based reduction reactions, H 2 Pc 4 and ZnPc 6 gave