Chain‐Length Dependence of the Electrochemical Properties of Conjugated Oligofluorenes

Summary: Electrochemical properties of monodisperse oligofluorenes ( OF n , n = 2 to 7) and corresponding polyfluorene were studied by cyclic and differential pulse voltammetry. In combination with data of UV‐vis absorption spectra, a series of linear relations such as the band gap, the oxidation potential, the ionization potential, and the electron affinity with the reciprocal number of the fluorene units (1/ n ) were deduced. When a chain length of ca. 14 repeat units is reached, a stable structure of about one positive charge per 3.5 repeat units is obtained. magnified image