New photo- and electroluminescent conjugated copolyfluorenes with 7,8,10-triarylfluoranthene units in the backbone

• Published in: Polymer science. Series B 2012-05, Vol.54 (5-6), p.289-296
• Main Authors: Keshtov, M. L., Mal’tsev, E. I., Marochkin, D. V., Muranov, A. V., Khokhlov, A. R.
• Format: Article
• Language: English
• Subjects: Argon; Chemistry; Chemistry and Materials Science; Derivatives; Electroluminescence; Emission; Functional Polymers; Heating; Monomers; Polymer Sciences; Solvents; Spectral emissivity
• ISSN: 1560-0904; 1555-6123
• DOI: 10.1134/S1560090412050016

A new monomer, the dibromo derivative of fluoranthene 1-[7,10-bis(4-bromophenyl)fluoranthen-8-yl]pyrene, is synthesized and used to prepare three new copolyfluorenes containing 3, 5, and 10 mol % 7,8,10-triarylfluoranthene groups via the Yamamoto reaction. The number-average molecular masses and polydispersities of the polymers vary in ranges 41900–78900 and 2.7–3.5, respectively. All polymers are soluble in common organic solvents, and their glass-transition temperatures are from 95 to 115°C. Temperatures corresponding to a 10% loss in weight during heating in argon and air are in the ranges 420–435 and 405–415°C, respectively. The photoluminescence spectra of the polymers exhibit strong blue emission with a maximum at 418 nm, whereas the absorption spectra show characteristic peaks at 351–357 nm. All polymers possess reversible or partially reversible redox behavior owing to high electric activity and demonstrate redox pairs at 1.51 eV (oxidation) and −2.09 eV (reduction).