Poly(benzobisthiazole)s containing tetrafluorophenyl and bromophenyl moieties were synthesized via the polycondensation of 2,5-diamino-1,4-benzenedithiol dihydrochloride with tetrafluorophthalic acid and 4-bromoisophthalic acid under a nitrogen atmosphere. The polymers were characterized by X-ray diffraction, spectroscopy (infrared and solid-state C-13 NMR), and thermal analysis, including differential scanning calorimetry and thermogravimetric analysis. The thermogravimetric analysis showed that the thermal stability of the polymers was 490-515 degreesC under a nitrogen atmosphere. The synthesized polymers showed good solubility in organic solvents.