Electroactive Fluorene Copolymers and Devices Made with Such Polymers

A 50-ml Schlenck tube equipped with a stirring bar containing bis(l,5-cyclooc-tadiene)-nickel(O) (4.48 mmol), 2,2 -bipyridyl (4.48 mmol), and 1,5-cycloocta-diene (4.48 mmol) was treated with 5 ml of DMF and the ensuing deep blue/ purple solution stirred at 60°C for 30 minutes. The mixture was then treated with 2,7-diiodo-9,9-bis(2-ethylhexyl)fluorene (1.68 mmol) and 2,5-bis(p-bromo-phenyl)-A-(p-hexylphenyl)pyrrole (0.56 mmol) in 20 ml of toluene by syringe and then stirred for 5 days at 75°C. The solution was cooled to ambient temperature and precipitated into a mixture of 100 ml apiece of methanol and acetone and 5 ml concentrated hydrochloric acid. After of the mixture was stirred for 2 hours, it was filtered the solid residue was dissolved in chloroform and re-precipitated in methanol and acetone solution, and re-filtered. The residue was successively washed with methanol, water and methanol, and dried the product was isolated having a Mj, of 47,200 daltons. 

TABLE 1. Monomers used in preparing fluorene copolymers. 

Note Entry 1 was stirred for 5 days at 75°C and then cooled while Entries 2 to 5 were capped with bromobenzene after 4 days of heating. 

TABLE 2. Light-emitting testing for fluorene copolymers in a light-emitting diode using different hole injection/transport layers. 

Aluminium-pyrazol-5-one derivatives, (I), prepared by Kathirgamanathan [1] were effective as white light emitters and used in organic electroluminescent devices. Bis(2-phenylimidazo[l,2-a]pyridinato-N,C)iridium derivatives, (II), prepared by Lussier [2] were effective as phosphorescent emission agents. 

---

Title Electroactive Fluorene Copolymers and Devices Made with Such Polymers... 

---