have been widely performed on linear molecular push-pull in order to optimize their photophysicalproperties while 2D systems are quite limited. We report herein the synthesis of four new chromophoresbased on bithiophene core end-capped with dibutylaminostyryl groups and functionalized on the 3,3′ position with different electron withdrawing groups. Optical and electrochemical characterizations have been
Dibutylamino end-capped benzo[2,1-b:3,4-b′]dithiophene-4,5-dione and benzo[2,1-b:3,4-b′]dithiophene versus non modified analogues: contribution of amino groups
We report the synthesis of two new organic semiconductors based on benzo[2,1-b:3,4-b′]dithiophene-4,5-dione and benzo[2,1-b:3,4-b′]dithiophene end-capped with dibutyl-aminostyryl groups. Theirs optical and electrochemical properties in solution were investigated by UV–visible absorption and cyclic voltammetry and compared to their analogs without amino groups.
A “Kite” Shaped Styryl End-Capped Benzo[2,1-<i>b</i>:3,4-<i>b</i>′]dithiophene with High Electrical Performances in Organic Thin Film Transistors
作者:Yahia Didane、Georg H. Mehl、Atsufumi Kumagai、Noriyuki Yoshimoto、Christine Videlot-Ackermann、Hugues Brisset
DOI:10.1021/ja807504k
日期:2008.12.31
The bridging of distyryl-bithiophene leads to a kite shape of the conjugated system. This twist is not like twistacenes or twist deformation in alpha-oligothiophenes but a curvature such as in bowl shaped systems. Initially perceived to be undesirable, this new semiconductor in OTFT devices provides excellent performances in air, mu = 0.1 cm(2)/V.s, I-on/I-off > 10(6), S < 4 V/decade, higher by a factor of 5 to the parent unbridged coplanar analogue.