Electrochemical study of octa-tert-butyl-substituted lanthanide diphthalocyanine complexes in solutions. Simulation of redox transitions by semiempirical calculations for yttrium diphthalocyanine

The electrochemical potentials of seven redox-transitions for the green forms and eight redox-transitions for the blue forms of neutral octa-tert-butyl-substituted lanthanide diphthalocyanine complexes Pc2tLn (Ln = Pr, Sm, Dy, Lu) in solutions were measured by the cyclic voltammetry and rotating disc electrode techniques. The spectroelectrochemical investigation of the products of two-electron oxidation and reduction of the green form of Pc2tLu was performed. ZINDO/1 calculations for (Pc2Y)m+,n- and absorption spectra show that for oxidation and reduction processes for the green forms of Pc2tLn the electron changes are mainly localized on the ligands