RESUMEN
Three non-fused A-D-A'-D-A π-conjugated metal-free small molecules BT-IT1, BT-IBT2 and BT2F-IBT3 have been synthesized and their absorption characteristics and redox properties, as well as charge carrier mobilities have been investigated. The resultant molecules exhibited broad absorption in the range of 325-600â nm in solutions and in thin films the absorption range is 350-700â nm. These new conjugated small molecules showed low-lying HOMO energy levels (-5.49 to -5.50â eV), deep LUMO energy levels (-3.67 to -3.69â eV) and narrow bandgaps of (Eg CV ) â¼0.79â eV. Appreciable electron mobilities for compounds BT-IBT2 and BT2F-IBT3 were 4.56×10-3 and 1.12×10-3 â cm2 V-1 s-1 , respectively, obtained by space-charge limited current (SCLC) measurements. Additionally, excellent photocatalytic performances of BT-2T (6), BT2F-2T (10), BT-IT1, BT-IBT2 and BT2F-IBT3 for highly selective oxidation of thioanisole to desired sulfoxides under visible light irradiation were observed.