Monodisperse Dialkoxy‐Substituted Oligo(phenyleneethenylene)s

Abstract

Abstract Individual but connected synthetic routes for the preparation of the all‐E ‐configured 2,5‐dipropoxy‐substituted oligo(1,4‐phenyleneethenylene)s 1a–g were developed. An increasing number of conjugated stilbene units from n = 1 to n = 11 led to a convergent bathochromic shift (Δλ = λ ∞ − λ 1 = 127 nm) in the UV/Vis absorption. An exponential function for the convergence of the absorption energies (wavelengths) in conjugated systems is proposed. By a simple extrapolation of this function the effective chain length may be determined.