Electrochemical Properties of a New Class of Europium Sandwich Triple-Decker Complexes with Corrole and Phthalocyanine Macrocycles

Abstract

The electrochemical properties of a new class of sandwich (phthalocyaninato)(corrolato) europium triple-decker complexes were synthesized and characterized by cyclic voltammetry in CH2Cl2 containing 0.1 M tetrabutylammonium perchlorate (TBAP) as supporting electrolyte. Two of the compounds described in the current paper are shown in the figure, and represented by HEu2[Pc(R)8]2[Cor(ClPh)3], where R = OC5H11 or OC8H17, Pc represents the dianion of phthalocyanine and Cor represents the trianion of corrole. Both triple-decker complexes exhibit five reversible oxidations and three reversible reductions, all of which are attributed to ligand-based redox processes. The half-wave potentials for the first oxidation and first and second reduction of the two europium triple-deckers are close to E 1/2 values for the double-decker species Eu[Pc(OC8H17)8]2, while half-wave potentials for the second to fifth oxidations are close to E 1/2 values for the triple-decker Eu2[Pc][Pc(OC8H17)8]2. The synthesis and electrochemical properties of the new compounds will be described. Acknowledgment: This work was supported by the Natural Science Foundation of China (No. 21001054, 21071067) and the Robert A. Welch Foundation (K.M.K., Grant E-680). Figure 1