摘要:
The syntheses and comparative studies of the spectral, voltammetry and spectroelectrochemical properties of new manganese phthalocyanine complexes, tetra-substituted with diethylaminoethanethio at the peripheral (complex 3a) and non-peripheral positions (complex 3b) are reported. Solution electrochemistry of complex 3a showed quasi-reversible metal-based ((MnPc-2)-Pc-III/(MnPc-2)-Pc-II, E-1/2 = -0.07 V vs. Ag vertical bar AgCl) and ring-based ((MnPc-2)-Pc-II/MnIIPc-3, E-1/2 = -0.78 V vs. Ag vertical bar AgCl) reductions, but no ring-based oxidation. However, complex 3b showed weak irreversible ring-oxidation signal (Ep = +0.86 vs. Ag vertical bar AgCl). Reversible metal-based ((MnPc-2)-Pc-III/(MnPc-2)-Pc-II, E-1/2 = -0.04 V vs. Ag vertical bar AgCl) and ring-based ((MnPc-2)-Pc-II/MnIIPc-3, E-1/2 = -0.68 V vs. Ag vertical bar AgCl) reductions were also observed for complex 3b. Spectroelectrochemistry was used to confirm these processes. Reduction process involving the metal ((MnPc-2)-Pc-III/(MnPc-2)-Pc-II) was associated with the formation of manganese l-oxo complex in complex 3a. (C) 2010 Elsevier B.V. All rights reserved.