Thiophene‐based conjugated oligomers and polymers with high electron affinity

The control of the bandgap of thiophene‐based polymers and oligomers has become an important topic in recent years. One strategy is the introduction of electron‐withdrawing groups in particular positions in the conjugated chain. An extension of this strategy is reported here: the synthesis and electrochemical investigation (e.g., analysis of the electropolymerization behavior) of a new series of π‐conjugated oligomers containing 3, 4, and 5 heterocycles and two CN groups at various positions of the ethylene linkage.