n-Type Field-effect Transistors Based on Thieno[3,2-b]thiophene-2,5-dione and the Bis(dicyanomethylene) Derivatives

Two new compounds, 3,6-bis(4-trifluoromethylphenyl)thieno[3,2-b]thiophene-2,5-dione (1) and 2,5-bis(dicyanomethylene)3,6-bis(4-trifluoromethylphenyl)thieno[3,2-b]thiophene (2), were synthesized and characterized. The crystal structure of 1 was determined by single-crystal X-ray structure analysis. Organic field-effect transistors (OFETs) showed a relatively good mobility up to 0.039 cm(2) V-1 s(-1) in 1 and a better air stability in 2.