Synthesis of thiophene/phenylene co-oligomers. II. Block and alternating co-oligomers

We report the synthesis of block and alternating thiophene/phenylene co-oligomers that is based either on the Suzuki coupling reaction or on the Grignard reaction. These reaction schemes enable us to obtain the target compounds at reasonably high yields. The resulting materials have been fully characterized through the solid-state C-13 nmr and Fourier-transform ir as well as the H-1 nmr. Of these, the solid-state C-13 nmr and ir are particularly useful in characterizing the materials of higher molecular weight, since those materials are difficult to dissolve in organic solvents.