Abstract We report the synthesis and physical study of a series of 1, 1-dicyano-4-[4- (diethylamino) phenyl] buta-1, 3-dienes in which the number and position of additional CN substituents along the 1, 1-dicyanobuta-1, 3-dienyl fragment is systematically varied. While X-ray analysis provided unambiguous information about molecular geometries in the crystal, UV/Vis and electrochemical measurements, by cyclic voltammetry (CV) and rotating disk ...