Oligothiophene Moiety Research Articles

A novel family of amorphous molecular materials containing an oligothiophene moiety as color‐tunable emitting materials for organic electroluminescent devices

The color of light emitted by organic electroluminescent devices can be tuned between light blue and orange in the family of materials presented here simply by varying the conjugation length (n = 1 to 4, see Figure) of the oligothiophene moiety. The synthesis of the amorphous molecular materials and the optical behavior of single‐layer electroluminescent devices based on them—see also the cover—are described.magnified image

Synthesis and properties of oligothiophene cation radical salts

Oligothiophene cation radical salts were first prepared by the electrochemical oxidation method employing large-sized anions PF 6 −, AsF 6, TaF 6, BF 4 and GaCl 4. Several large-sized anions (AsF 6, TaF 6 and GaCl 4) gave black-needle crystalline salts. All the salts showed semiconductive behavior with the electrical conductivities of 10 −4–10 −6 S/cm. Electrical conductivity and spectroscopic measurements on the cation radical salts have suggested that oligothiophene moiety in the present salts is highly oxidized, as in oligothiophene doped with nitrosyl salt.

Electrochemical synthesis of one-dimensional donor–acceptor polymers containing oligothiophenes and phosphorus porphyrins

Novel porphyrin polymers linked in the axial direction, which have an alternating one-dimensional structure of oligothiophene (electron donor) and PV porphyrin (electron acceptor), have been synthesized by the electrochemical polymerization of symmetrical PV porphyrin triads with two oligothiophene moieties.