Electrochemistry of Novel Phthalocyanines Bearing 1,2,4 Triazole Groups

Abstract

The phthalonitrile (3) and triazole substituted metallo phthalocyanines (MPc) (4–7) were prepared. The novel compounds were characterized with spectroscopic data. Electrochemical analyses of metallophthalocyanines (4–7) bearing triazole substituents were performed to investigate redox activity of phthalocyanines (Pcs) ring. While incorporation of Ni2+ and Cu2+ cations in the Pc core only influenced peak positions of Pc ring processes, Co2+ and Cl1−Fe3+ cations of CoPc and FePc gave extra redox couples to the Pc based ones. Releasing the axial Cl1− anion on Fe3+ cation of FePc during the reduction reactions complicated the redox responses. Redox reactions of Co2+ and Fe3+ metal centers also considerable influenced spectral and color responses of these complexes.

Metallo‐phthalocyanines Containing 1,3,4‐oxadiazole Substituents: Synthesis, Characterization, Electrochemical and Spectroelectrochemical Properties

“…When further negative potential was applied, the Q band disappeared and the intensity of the peak at around 550 nm decreased. This behavior was characteristic of the ringbased reduction process [59][60][61][62][63] and supported the CV responses. During the oxidation reaction, CuPc and NiPc complexes gave ring-based oxidation species.…”

Synthesis, Characterization and Investigation of Electrochemical and Spectroelectrochemical Properties of Peripherally Tetra Diethoxypropan Substituted Phthalocyanines

“…Compared to redox‐active and redox inactive metal center of phthalocyanines, the reduction potential of redox‐active Pc shifted to more positive potential and to more oxidation potential unlike non‐redox active Pcs. This difference is characteristic for redox‐active complexes [20]. I.A.…”

Electrochemical and in-situ spectroelectrochemical behaviors of non-peripherally tetra substituted zinc(II) and magnesium(II) phthalocyanines

“…The electrochemical responses of ZnPc were showed in Figure 2. ZnPc exhibited three reduction couples at -0.67, -1.08 and -1.77 V and one oxidation couple at 0.81 V and data are also tabulated in Table 1 (24)(25)(26). This result can be stemmed from electron-releasing character of 4-(4,5-diphenyl-4H-1,2,4-triazol-3-ylthio) substituent.…”

“…Figure 1 shows the structure of the synthesized non-peripherally tetra substituted zinc(II) and magnesium(II) phthalocyanines. (24)(25)(26). This result can be stemmed from electron-releasing character of 4-(4,5-diphenyl-4H-1,2,4-triazol-3-ylthio) substituent.…”