C–N cross coupling approach synthesis and electronic properties of donor–acceptor oligomer

Abstract

C-N cross coupling approach synthesis of donor-acceptor oligomer containing 9,9-dioctyl-N 2 ,N 7 -diaryl-9H-fluorene-2,7-diamine and 5-octyl-1,3-di(thiophen-2-yl)-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione has been reported. The electronic properties of the synthesized oligomers were studied by UV-visible spectroscopy, fluorescence spectroscopy, cyclic voltammetry and computational analysis. The oligomers absorb the visible light at around 508-520 nm, both in solution as well as in solid state. We observed dual emission band centred at around 595 nm (LE emission) and 650 nm (CT emission) with a long tail in near-infrared (NIR) spectral region when the oligomers were excited at around 510 nm. Large Stokes shifts (~130 nm) led to deep red emission which was likely due to the interaction of donor-acceptor units of the oligomer backbone. Overall, the experimental and theoretical results of these oligomers indicate that they can be used as a promising materials for organic electronics.is summarized in Scheme 1. Starting from commercially available 9,9-dioctyl-2,7-dibromofluorene (4) and arylamine (5 a-c),[a] Dr.

Design and synthesis of thieno[3,4‐c]pyrrole‐4,6‐dione based conjugated copolymers for organic solar cells

“…Monomers 3 , 4 and 6 were synthesized according to the reported procedure . Trimethyl(thieno[3,2‐ b ]thiophen‐2‐yl)stannane was synthesized according to the procedure .…”