Electroanalytical Investigation of 2,2′,7,7′‐Tetrakis(diphenylamino)‐9,9′‐spirobifluorene

Abstract

Two voltammetric techniques, cyclic voltammetry (CV) and chronocoulometry (CC), were used to investigate the redox characteristics of an organic semiconductor, 2,2 0 ,7,7 0 -tetrakis(diphenylamino)-9,9 0spirobifluorene (spiro-TAD). The electron-transfer characteristics of spiro-TAD, including the formal oxidation potentials (E o0 ), diffusion coefficients (D o ), and electron-transfer rate constants (k o0 ), were estimated by a combination of CV and CC measurements. The energy of the highest-occupied molecular-orbital could also be found from the quantitative relationship between the oxidation potential and the ionization energy.