**Acknowledgements**

of unsubstituted iron(II) phthalocyanines deposited on the electrodes by electropolymeriza‐ tion were applied in oxidation reactions of organic compounds. Such reactions were carried out in two kinds of systems: (i) phenolic resin/unsubstituted iron(II) phthalocyanine or (ii) the phenolic resin/structurally branched iron(II) phthalocyanine [70, 71]. In another study, various thiol derivatives (e.g., 2‐mercaptoethanol) were applied as substrates in electrooxida‐ tion reaction toward disulfides. Transparent indium tin oxide electrodes were modified with

The iron(II/III) porphyrazines and phthalocyanines have interesting electrochemical proper‐ ties, which were demonstrated in many valuable studies performed during the last 30 years. Moreover, many applications of these macrocycles were presented in medicine, in biomedical and analytical fields, in materials chemistry as well as in chemical synthesis. It clarifies why catalytic abilities of iron(II/III) tetraazaporphyrins became an object of intense studies. This chapter aimed to summarize the influence of peripheral substituents of iron(II/III) porphyr‐ azines and phthalocyanines on their spectral and electrochemical properties. Electrochemical properties of iron(II/III) porphyrazine and phthalocyanine complexes are significantly influ‐ enced by the periphery of the macrocycle, which can lead to an increase or a decrease of their electrochemical activity. Similarly, an axial coordination of molecules to the central metal ion causes a shift of the oxidation potential of the macrocycle or splits peaks belonging to oxidation processes. Selected studies on iron(II/III) porphyrazines and phthalocyanines were found not only to present their interesting physicochemical features but also further perspec‐ tive applications, and thus, they were discussed in more detail. What is of immense value for further applications of these molecules in materials chemistry and nanotechnology is that some macrocycles demonstrated an ability to form coordination assemblies alone or with nanostructures, including fullerenes, and molecular wires. Especially interesting are binu‐ clear complexes based on iron(II/III) porphyrazine and phthalocyanine bridged by oxygen, nitrogen or carbon atoms. Interesting modification of classical redox processes was observed in novel potential molecular quantum‐dot cellular automata cells in which phthalocyanines were connected "side‐by‐side" or by forming ball‐type dimers in which there were utilized sophisticated linkers binding two phthalocyanine units at two sides rigidly with four linking arms. Porphyrinoid catalysts also have the designation by biomimetic catalysts, this being because they are more effective in carrying out the oxidation reactions of organic compounds to other catalysts. It is related to the increased electron‐donor effect of the ferric cation, which is conjugated to the π‐electron system of the macrocyclic ring. The advantages of iron(II/III) porphyrazines and phthalocyanines as catalysts include high selectivity, mild and environ‐ mentally friendly reaction conditions and low energy consumption during catalysis. Studies of catalytic properties or iron(II/III) Pzs and Pcs concerned mostly with their potential applica‐ tions in oxidation reactions of linear and cyclic alkenes as well as photocatalytic degradation of organic dyes. Some studies assessed the ability of iron(II/III) tetraazaporphyrins and their dimers in decomposition and removal of organic pollutants from industrial wastes. A huge

iron(II) tetraaminophthalocyanine [72, 73].

114 Recent Progress in Organometallic Chemistry

**4. Summary**

Authors thank the National Science Centre, Poland, for funding (grant no. 2015/17/N/NZ7/009 43).
