Direct C-H Arylation as a Chemoselective Single-Step Access to π-Acceptor-π Type Building Blocks
作者:Kuan-Ming Lu、Wei-Ming Li、Po-Yu Lin、Kuan-Ting Liu、Ching-Yuan Liu
DOI:10.1002/adsc.201700762
日期:2017.11.10
Different from the traditional multi‐step synthesis, a chemoselective direct C–H arylation is reported for the single‐step synthesis of various useful π–acceptor–π (π–A–π) type building blocks for use in organic electronics. This well‐optimized C–H heteroarylation exhibits good product yields, broad substrate scope, and high functional group compatibility. Applications in the efficient synthesis of
Functionalized Isothianaphthene Monomers That Promote Quinoidal Character in Donor–Acceptor Copolymers for Organic Photovoltaics
作者:Jessica D. Douglas、Gianmarco Griffini、Thomas W. Holcombe、Eric P. Young、Olivia P. Lee、Mark S. Chen、Jean M. J. Fréchet
DOI:10.1021/ma300589k
日期:2012.5.22
A series of low band gap isothianaphthene-based (ITN) polymers with various electron-withdrawing substituents and intrinsic quinoidal character were synthesized, characterized, and tested in organic photovoltaic (OPV) devices. The three investigated ITN cores contained either ester, imide, or nitrile functionalities and were each synthesized in only four linear steps. The relative electron-withdrawing strength of the three substituents on the ITN moiety was evaluated and correlated to the optical and electronic properties of ITN-based copolymers. The ester- and imide-containing p-type polymers reached device efficiencies as high as 3% in bulk heterojunction blends with phenyl C-61-butyric acid methyl ester (PC61BM), while the significantly electron-deficient nitrile-functionalized polymer behaved as an n-type material with an efficiency of 0.3% in bilayer devices with poly(3-(4-n-octyl)phenylthiophene) (POPT).
Benzodithiophene and Imide-Based Copolymers for Photovoltaic Applications
作者:Wade A. Braunecker、Zbyslaw R. Owczarczyk、Andres Garcia、Nikos Kopidakis、Ross E. Larsen、Scott R. Hammond、David S. Ginley、Dana C. Olson
DOI:10.1021/cm2038427
日期:2012.4.10
Conjugated alternating copolymers were designed with low optical band gaps for organicphotovoltaic (OPV) applications by considering quinoid resonance stabilization. Copolymers of thienoisoindoledione (TID) and benzodithiophene (BDT) had appreciably lower band gaps (by ∼0.4 eV) than copolymers of thienopyrroledione (TPD) and BDT. In addition to intramolecular charge transfer stabilization (i.e., the