Precision Synthesis of Conjugated Polymer Films by Surface-Confined Stepwise Sonogashira Cross-Coupling.

Autor: Youm SG; Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA., Howell MT; Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA., Chiang CH; Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA., Lu L; Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA., Kuruppu Arachchige NMK; Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA., Ankner JF; Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA., Strzalka J; X-Ray Science Division, Argonne National Laboratory, Argonne, IL 60439, USA., Losovyj Y; Department of Chemistry, Indiana University, Bloomington, IN 47401, USA., Garno JC; Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA., Nesterov EE; Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, IL 60115, USA.; Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA.
Jazyk: angličtina
Zdroj: Molecules (Basel, Switzerland) [Molecules] 2024 Nov 20; Vol. 29 (22). Date of Electronic Publication: 2024 Nov 20.
DOI: 10.3390/molecules29225466
Abstrakt: Thin films of poly(arylene ethynylene)-conjugated polymers, including low-energy-gap donor-acceptor polymers, can be prepared via stepwise polymerization utilizing surface-confined Sonogashira cross-coupling. This robust and efficient polymerization protocol yields conjugated polymers with a precise molecular structure and with nanometer-level control of the organization and the uniform alignment of the macromolecular chains in the densely packed film. In addition to high stability and predictable and well-defined molecular organization and morphology, the surface-confined conjugated polymer chains experience significant interchain electronic interactions, resulting in dominating intermolecular π-electron delocalization which is primarily responsible for the electronic and spectroscopic properties of polymer films. The fluorescent films demonstrate remarkable performance in chemosensing applications, showing a turn-off fluorescent response on the sub-ppt (part per trillion) level of nitroaromatic explosives in water. This unique sensitivity is likely related to the enhanced exciton mobility in the uniformly aligned and structurally monodisperse polymer films.
Databáze: MEDLINE
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