The synthesis of fluorene/thiophen-based conjugated polymers via solid-state reaction

A novel fluorene derivative 2,7-dithiophen-fluorene has been synthesized by coupling of 2,7-dibromo- fluorene and 2-(tributylstannyl)-thiophene via Stille reaction.The corresponding polymer poly(2,7-dithiophen- fluorene)was synthesized by one-step solid-state reaction at room temperature,and the intrinc viscosity,of which in DMF is 0.68dL/g at 25℃.To our knowledge,it's the first time to prepare fluorene-based conjugated polymers using this polymerization method by nowadays.The chemical structure of monomer and polymer was verified by ~1H-NMR,FT-IR and elemental analysis,and the ~1H-NMR and FT-IR results showed that polymeri- zation was happened at the e,e′-positions of 2,7-dithiophen-fluorene.The optical,crystallization state and ther- modynamic properties of polymer were also investigated here.