In order to understand how additives influence the structure and electrical properties of active layers in thin-film devices, a compositionally identical but structurally different guest-host system based on the syn and anti isomers of triethylsilylethynyl anthradithiophene (TES ADT) is systematically explored. The mobility of organic thin-film transistors (OTFTs) comprising anti TES ADT drops with the addition of only 0.01% of the syn isomer and is pinned at the mobility of OTFTs having pure syn isomer after the addition of only 10% of the isomer. As the syn isomer fraction increases, intermolecular repulsion increases, resulting in a decrease in the unit-cell density and concomitant disordering of the charge-transport pathway. This molecular disorder leads to an increase in charge trapping, causing the mobility of OTFTs to drop with increasing syn-isomer concentration. Since charge transport is sensitive to even minute fractions of molecular disorder, this work emphasizes the importance of prioritizing structural compatibility when choosing material pairs for guest-host systems.
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http://dx.doi.org/10.1002/adma.201700048 | DOI Listing |
J Am Chem Soc
January 2025
Department of Chemistry and Nuclear Science & Engineering Center, Colorado School of Mines, Golden, Colorado 80401, United States.
The and isomers of [Sm(dicyclohexano-18-crown-6)(HO)]I exhibiting water molecules bound to the Sm ion have been isolated and characterized. Sm possesses an electrochemical potential sufficient for water reduction, and thus these complexes add to the recent body of evidence that the oxidation of Sm by water can operate by a mechanism that is not straightforward. These complexes are obtained by the direct addition of stoichiometric amounts of water to solutions of the respective Sm(dicyclohexano-18-crown-6)I isomers under an inert atmosphere.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Faculty of Chemistry, University of Łódź, Tamka 12, 91403 Łódź, Poland.
Cofacial arrangement of two Blatter radicals enforced by the -naphthalene scaffold represents a new approach to stable diradicals with strong through-space interactions. Two stereoisomers of the naphthalene-diradicals, and , are investigated by XRD, VT-EPR, UV-vis, electrochemical, kinetic, and DFT methods. In solutions, both stereoisomers exist as open-shell singlets with Δ = -3.
View Article and Find Full Text PDFJ Phys Chem A
December 2024
Department of Chemistry, University of Isfahan, 81746-73441 Isfahan, Iran.
We present herein our computational exploration of the conformational landscape and photophysical properties of protonated adenosine (AdoH). Several different protonated isomers and conformers have been considered and their relevant photophysical properties have been addressed. From our quantum computational results, an S/S conical intersection (CI) has been located for all considered conformers, providing a significant route for the ultrafast deactivation mechanism of the S excited state of AdoH.
View Article and Find Full Text PDFChem Sci
January 2025
University of Strasbourg, CNRS, IPCMS 23 Rue du Loess 67034 Strasbourg France
Archaerhodopsin-3 (AR-3) variants stand out among other rhodopsins in that they display a weak, but voltage-sensitive, near-infrared fluorescence emission. This has led to their application in optogenetics both in cell cultures and small animals. However, in the context of improving the fluorescence characteristics of the next generation of AR-3 reporters, an understanding of their ultrafast light-response in light-adapted conditions, is mandatory.
View Article and Find Full Text PDFOrg Lett
November 2024
State Key Laboratory of Environmental Chemistry and Eco-toxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
Thuggacin A () is a 17-membered-ring-polyketide antibiotic compound with excellent antituberculosis activity. The total synthesis of thuggacin A has not yet been reported so far. Herein, we disclose our efforts toward the convergent total synthesis of thuggacin A.
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