A Novel Family of Phosphole-Thiophene Oligomers for Optoelectronic Applications

A 2-terthienylphospholide can be prepared from a 1-terthienylphosphole by reaction with tBuOK in diglyme at 150 degrees C. This phospholide is then transformed into the corresponding 1-methyl-2-terthienylphosphole-borane. This borane complex fluoresces at 5 10 nm in CH2Cl2 with a quantum yield of 0.17. The excited-state displays a significant charge transfer between the terthienyl substituent and the phosphole ring as shown by the shift of the emission to lower energies upon increasing the polarity of the solvent.