Journal ArticleDOI
Pentacene appended to a TEMPO stable free radical: the effect of magnetic exchange coupling on photoexcited pentacene.
Erin T. Chernick,Rubén Casillas,Johannes Zirzlmeier,Daniel M. Gardner,Marco Gruber,Henning Kropp,Karsten Meyer,Michael R. Wasielewski,Dirk M. Guldi,Rik R. Tykwinski +9 more
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TLDR
Time-resolved electron paramagnetic resonance experiments confirm that triplet quenching is accompanied by electron spin polarization transfer from the pentacene excited state to the TEMPO doublet state in the weak coupling regime.Abstract:
Understanding the fundamental spin dynamics of photoexcited pentacene derivatives is important in order to maximize their potential for optoelectronic applications. Herein, we report on the synthesis of two pentacene derivatives that are functionalized with the [(2,2,6,6-tetramethylpiperidin-1-yl)oxy] (TEMPO) stable free radical. The presence of TEMPO does not quench the pentacene singlet excited state, but does quench the photoexcited triplet excited state as a function of TEMPO-to-pentacene distance. Time-resolved electron paramagnetic resonance experiments confirm that triplet quenching is accompanied by electron spin polarization transfer from the pentacene excited state to the TEMPO doublet state in the weak coupling regime.read more
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Journal ArticleDOI
Strongly exchange-coupled triplet pairs in an organic semiconductor
Leah R. Weiss,Sam L. Bayliss,Felix Kraffert,Karl J. Thorley,John E. Anthony,Robert Bittl,Richard H. Friend,Akshay Rao,Neil C. Greenham,Jan Behrends +9 more
TL;DR: Gates-Cambridge Trust, Winton Programme for the Physics of Sustainability, Freie Universitat Berlin within the Excellence Initiative of the German Research Foundation, Engineering and Physical Sciences Research Council (Grant ID: EP/G060738/1) as discussed by the authors
Journal ArticleDOI
Radical-Enhanced Intersystem Crossing in New Bodipy Derivatives and Application for Efficient Triplet-Triplet Annihilation Upconversion.
Zhijia Wang,Jianzhang Zhao,Antonio Barbon,Antonio Toffoletti,Yan Liu,Yonglin An,Liang Xu,Ahmet Karatay,Halime Gul Yaglioglu,Elif Akhuseyin Yildiz,Mustafa Hayvali +10 more
TL;DR: The efficient ISC and long-lived triplet excited state in this flexible EISC system are in stark contrast to the previously studied rigid EISC systems.
Journal ArticleDOI
Azaacenes as active elements for sensing and bio applications
TL;DR: It is believed that a rapid development in the research of sensors and bio applications based on azaacenes will be witnessed in the coming years due to their tuneable structures, optical properties and binding abilities.
Journal ArticleDOI
A Derivative of the Blatter Radical as a Potential Metal-Free Magnet for Stable Thin Films and Interfaces
Francesca Ciccullo,Nolan M. Gallagher,O. Geladari,Thomas Chassé,Andrzej Rajca,Maria Benedetta Casu +5 more
TL;DR: This work has investigated the thin films of a derivative of the Blatter radical that was synthesized bearing in mind the thermodynamic factors that govern thin film stability, and proved the concept by investigating the electronic structure, the paramagnetic character, and stability of the obtained films under UHV and ambient conditions by in situ X-ray photoelectron spectroscopy, ex situ atomic force microscopy, and electron paramagnetic resonanceSpectroscopy.
Journal ArticleDOI
Strategies for the Synthesis of Higher Acenes
Ruth Dorel,Antonio M. Echavarren +1 more
TL;DR: The outstanding performance of pentacene‐based molecules in molecular electronics, as well as the predicted enhanced semiconducting properties of extended acenes, have stimulated the development of new synthetic methods and functionalization strategies for the preparation of stable and soluble acenes larger than tetracene with the aim of obtaining improved functional materials.
References
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The larger acenes: versatile organic semiconductors.
TL;DR: New approaches to add functionality were developed to improve the processability of these materials in solution, allowing the synthesis of acenes larger than pentacene, which have hitherto been largely unavailable and poorly studied.
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Organic semiconducting oligomers for use in thin film transistors.
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Tetrathiafulvalenes, oligoacenenes, and their buckminsterfullerene derivatives: the brick and mortar of organic electronics.
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Functionalized Pentacene: Improved Electronic Properties from Control of Solid-State Order
TL;DR: The preparation of two functionalized pentacene derivatives, and the effect of this functionalization on both the solid-state ordering and the electronic properties of the resulting crystals is reported.