Poly(indenofluorene)s (PIF) — Novel conjugated pojyhydrocarbon polymers

Abstract We are describing the synthesis of a novel class of hydrocarbon polymers, poly(indenofluorene)s PIF , composed of 3,9-di- t -butylindeno[l,2-b]fluorene- ( 2 ) or 3,7-di- t -butylindeno[2,1-b]fluorene ( 7 ) building blocks. The polymers, with high degrees of polymerization (DP: > 20), were generated by reductive coupling of the tetrachloro-indenofluorene monomers 5 and 6 with low valent transition metal reagents as dehalogenating agents. PIF 2 exhibits a widely red shifted longest wavelength absorption maximum (λ max : ca. 800 nm, 1,55 eV). We have also generated diketo-terminated oligomeric model compounds 9 . The oligomers 9 are suitable models for an investigation of the electronic properties of the corresponding polymer PIF 2 .