p-type semiconducting dendrimers bearing thiophenyl peripheral moieties for organic field effect transistors

First generation thiophene-labeled conjugated dendrimers have been synthesized through the Heck coupling reaction between the 5-hexyl-5-propenyl thiophene derivative and 1, 2, 4, 5-tetrabromo-benzene as the core. They display a p-type semiconducting behavior and a considerably better solubility than the linear conjugated oligothiophene. Two crystalline dendrimers such as 4(HPBT)-benzene and 4(HPTT)-benzene showed carrier mobilities as high as 6.2x10(-3) and 2.4x10(-4) cm(2) V-1 s(-1), respectively. (c) 2006 American Institute of Physics.