4,7-Dibromo-5,6-di-n-octyloxy-2,1,3-benzothiadiazole (CAS# 1192352-08-1) acts as an electrochromophore in benzodithiophene-based electrochromic materials. In solution, 4,7-dibromo-5,6-di-n-octyloxy-2,1,3-benzothiadiazole has a tunable band gap, is capable of colour switching, and has good redox stability.