Three 2-halo-subsituted pentacene derivatives were prepared from stable and soluble carbonyl adduct precursors of high purity in high yields. These precursors were synthesized from the corresponding anthraquinones in overall yields about 30%. The crystals of 2-substituted pentacenes were grown by using a method of physical vapor transport. Organic field effect transistors made with these crystals displayed p-type charge carrier characteristics with the highest hole mobility of 5.0 cm2 V-1 s-1.
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