10.1021/acs.macromol.5b02659.s001 Christian J. Mueller Christian J. Mueller Tobias Klein Tobias Klein Eliot Gann Eliot Gann Christopher R. McNeill Christopher R. McNeill Mukundan Thelakkat Mukundan Thelakkat Azido-Functionalized Thiophene as a Versatile Building Block To Cross-Link Low-Bandgap Polymers American Chemical Society 2016 Solvent resistivity absorption electrochemical properties UV illumination polymerization techniques Versatile Building Block polymer films azide functionality HOMO Thermal stability model blend system butyric acid methyl ester field effect transistors azide groups photoluminescence measurements PC 70 BM 2016-05-03 13:59:39 Journal contribution https://acs.figshare.com/articles/journal_contribution/Azido_Functionalized_Thiophene_as_a_Versatile_Building_Block_To_Cross_Link_Low_Bandgap_Polymers/3208015 We unveil a concept for the design of cross-linkable semiconducting polymers that is based on a modular tercopolymerization which stands out by its low synthetic effort, easy accessibility, and its broad range of applications. 3-(6-Azidohexyl)­thiophene was used as a comonomer in the synthesis of a variety of low-bandgap copolymers using different polymerization techniques such as Suzuki–Miyaura cross-coupling and Stille cross-coupling. We show that when only a small amount (5–10 mol %) of azide groups is introduced into the polymers, the impact on absorption and electrochemical properties (HOMO/LUMO values) is negligible. The small amount of azide functionality is however enough to obtain polymers that can easily be cross-linked by UV illumination. Thermal stability of the solid state packing and alignment is studied in neat polymer thin films as well as in blends with [6,6]-phenyl-C<sub>71</sub>-butyric acid methyl ester (PC<sub>70</sub>BM) as a relevant model blend system. Solvent resistivity of these polymer films is investigated by absorption and photoluminescence measurements. It is finally shown in organic field effect transistors that the introduction of 10% azide-functionalized monomer does not considerably influence hole transport mobility (0.20–0.45 cm<sup>2</sup> V<sup>–1</sup> s<sup>–1</sup>).