Photoconductive Polysilanes Bearing Charge-photogenerating Groups Based on Carbazole. 2 Synthesis via the Chemical Modification of Poly(alkylphenylsilane)s

✍ Scribed by Marc Lemmer; Philippe Bebin; Maurice Sepulchre; Nathalie Marc; Jean-Yves Moisan

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 399 KB
• Volume: 8
• Category: Article
• ISSN: 1042-7147
• DOI: 10.1002/(sici)1099-1581(199703)8:3<125::aid-pat644>3.0.co;2-b

✦ Synopsis

The chemical modification of poly(alkylphenylsilane)s via the partial dearylation by reaction with triflic acid followed by the nucleophilic substitution of triflate groups by carbazolyllithium and 4-(9-carbazolyl)phenyllithium was applied to poly(methylphenylsilane)s and poly(ethylphenylsilane)s prepared under various experimental conditions in order to obtain polysilanes exhibiting photoconductive properties combining the high charge-photogenerating quantum yield of poly(vinylcarbazole) and the high charge-carrier mobility of polysilanes. Polymers containing 7-20% of the desired unit bearing the potential charge photogenerating site were synthesized by this way. The strong degradation of the Si chain induced by triflic acid limits the molecular weight and, in some cases, the amount of isolated derivatized polysilanes. When the charge-photogenerating sites are conjugated with the Si chain, the corresponding polysilanes doped with 2,4,7-trinitro-9-fluorenone (TNF) may exhibit improved photoconductive properties compared with those observed for the poly(vinylcarbazole)/TNF system.