Polymer Bulletin, Vol.66, No.7, 893-903, 2011
Conjugated opto/electroactive ethynylene-carbazole polymers with TTF as pendant group
Three conjugated ethynylene-carbazole polymers with Tetrathiafulvalene (TTF) as pendant group (P1-P3) were synthesized by using sonogashira coupling reaction and characterized by H-1 NMR, GPC, CV, UV-Vis, FL, and TGA. CV and UV-Vis spectra showed that an intramoleular interaction existed between the electron-rich moiety TTF and electron-deficient moiety polyethynylcarbazole of the polymers. A strong fluorescence quench (ca. 99%) could be observed, compared to the polyethynylene-carbazole without TTF units, which could be ascribed to the photo-induced electron transfer (PET) interaction from TTF moiety to the polyethynylene-carbazole backbone. The observed onset decomposition temperatures (T-d) for P1-P3 varied from 256 to 298 degrees C. The polymers mentioned above exhibited good thermal properties and higher conductivity (neutral conductivity similar to 7-11 x 10(-7) S cm(-1); doped conductivity similar to 6-11 x 10(-4) S cm(-1)).