Pyrazino[2,3-g]quinoxaline-2,7-dione based π-conjugated polymers with affinity towards acids and semiconductor performance in organic thin film transistors

Pyrazino[2,3-g]quinoxaline-2,7-dione (PQx) was used as a building block for pi-conjugated polymer semiconductors, which demonstrated a strong acid affinity by showing marked bathochromic shifts in their absorption spectra. These polymers exhibited semiconductor performance in organic thin film transistors (OTFTs). Copolymers of PQx and bithiophene exhibited electron-dominant ambipolar transport characteristics with electron mobilities of up to 4.28 x 10(-3) cm(2) V-1 s(-1) and hole mobilities of up to 5.22 x 10(-4) cm(2) V-1 s(-1), while copolymers of PQx and thieno[3,2-b]thiophene exhibited hole-dominant ambipolar transport characteristics with hole mobilities of up to 4.82 x 10(-2) cm(2) V-1 s(-1) and electron mobilities of up to 3.95 x 10(-3) cm(2) V-1 s(-1).