Femtosecond dynamics of electron transfer in a neutral organic mixed-valence compound

Maksimenka, Raman; Margraf, Markus; Köhler, Juliane; Heckmann, Alexander; Lambert, Christoph; Fischer, Ingo

doi:10.1016/j.chemphys.2007.11.022

Cited by 20 publications

(47 citation statements)

References 50 publications

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“…The ET dynamics of compound 207 was investigated in solvents of different polarity by time-resolved transient spectroscopy in the femtosecond time domain. [273] These studies yielded a BET rate constant in benzonitrile three orders of magnitude larger than in hexane. The increased rates with increasing solvent polarity was explained by a more effective stabilization of the strongly polar excited state compared to the ground state in polar solvents.…”

Section: Mixed-valence Compoundsmentioning

confidence: 99%

Organic Mixed‐Valence Compounds: A Playground for Electrons and Holes

Heckmann¹,

Lambert²

2011

Angew Chem Int Ed

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Mixed-valence (MV) compounds are excellent model systems for the investigation of basic electron-transfer (ET) or charge-transfer (CT) phenomena. These issues are important in complex biophysical processes such as photosynthesis as well as in artificial electronic devices that are based on organic conjugated materials. Organic MV compounds are effective hole-transporting materials in organic light emitting diodes (OLEDs), solar cells, and photochromic windows. However, the importance of organic mixed-valence chemistry should not be seen in terms of the direct applicability of these species but the wealth of knowledge about ET phenomena that has been gained through their study. The great variety of organic redox centers and spacer moieties that may be combined in MV systems as well as the ongoing refinement of ET theories and methods of investigation prompted enormous interest in organic MV compounds in the last decades and show the huge potential of this class of compounds. The goal of this Review is to give an overview of the last decade in organic mixed valence chemistry and to elucidate its impact on modern functional materials chemistry.

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Section: Mixed-valence Compoundsmentioning

confidence: 99%

Organic Mixed‐Valence Compounds: A Playground for Electrons and Holes

Heckmann¹,

Lambert²

2011

Angew Chem Int Ed

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504

495

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“…One advantage of PTM is that it is easier to change one or two of the peripheral chlorine atoms into bromine atoms by chemical means than TTM, making it conducive to modify the molecular structure with various substituent groups with higher yields and then exploring their applications and other aspects. 59,60 Recently, one crucial discovery of the PTM derivatives is that the Aufbau principle could be violated if the substitute groups introduced to the PTM possess a rather strong electron-donating ability. 28 In 1923, the Aufbau principle was proposed by Niels Bohr, who emphasized that "a maximum of two electrons are put into orbitals in the order of increasing orbital energy."…”

Section: Ptm Radicalsmentioning

confidence: 99%

Stable Luminescent Radicals and Radical-Based LEDs with Doublet Emission

et al. 2020

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Radical-based light-emitting diodes are an innovative type of organic light-emitting diodes (OLEDs), which adopt luminescent radicals as emitters, aiming at improving the external quantum efficiency (EQE) of OLEDs. Research on luminescent radicals and the corresponding devices is a multidisciplinary field involving organic chemistry, solid-state physics, photochemistry, electronics, and others. The relevant theories have been established step-by-step in recent years. Considering the rapid development tendency, it is time to systematically summarize and discuss the doublet emission mechanism in devices, as well as the design principles of stable luminescent radicals. It is also of great importance to point out future developments in this area. In this minireview, the relevant advancements on radical-based OLEDs and stable radicals, especially those possessing luminescent properties, are summarized, respectively. Besides, the doublet emission mechanism is elaborated systematically. Some novel findings on stable luminescent radicals are also introduced. Finally, future developments and challenges in this field are presented.

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“…[ [270] extrahierte Übergangsmomente m ab , durch EAOM bestimmte adiabatische Dipolmomentdifferenzen Dm ab , durch Gleichung (10) Die ET-Dynamik von Verbindung 207 wurde in verschieden polaren Lçsungsmitteln durch zeitaufgelçste transiente Spektroskopie im Femtosekundenbereich untersucht. [273] Diese Studien ergaben eine dreifach hçhere BETGeschwindigkeitskonstante in Benzonitril als in Hexan. Die mit steigender Lçsungsmittelpolarität hçheren Geschwindigkeiten kann man durch eine effektivere Stabilisierung des stark polaren angeregten Zustands im Vergleich zum Grundzustand erklären.…”

Section: Organische Mv-verbindungen Mit Bor-redoxzentrenunclassified

Organische gemischtvalente Verbindungen: ein Spielplatz für Elektronen und Löcher

2011

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Gemischtvalente (MV) Verbindungen sind ausgezeichnete Modellsysteme, um grundlegende Elektronentransport(ET)‐ und Ladungstransfer(CT)‐Phänomene zu untersuchen. Diese sind in komplexen biophysikalischen Prozessen wie der Photosynthese, aber auch in artifiziellen elektronischen Bauteilen von großer Bedeutung. So sind organische MV‐Verbindungen effiziente Lochtransportmaterialien in organischen lichtemittierenden Dioden (OLEDs), Solarzellen und photochromen Fenstern. Die Bedeutung der organischen gemischtvalenten Chemie sollte jedoch weniger in ihrer direkten Anwendbarkeit gesehen werden, als vielmehr in dem riesigen Kenntnisschatz über Elektronentransferphänomene, der durch ihr Studium gewonnen wurde. Die große Vielfalt an organischen Redoxzentren und Brückeneinheiten, die zu MV‐Verbindungen kombiniert werden können, sowie die stete Weiterentwicklung von ET‐Theorien und ET‐Untersuchungsmethoden förderten das enorme Interesse an organischen MV‐Verbindungen in den letzten Jahrzehnten und zeigen das große Potential dieser Verbindungsklasse auf. Das Ziel dieses Aufsatzes ist es, das letzte Jahrzehnt der organischen gemischtvalenten Chemie zusammenzufassen und ihren Einfluss auf moderne funktionelle Materialien hervorzuheben.

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Femtosecond dynamics of electron transfer in a neutral organic mixed-valence compound

Cited by 20 publications

References 50 publications

Organic Mixed‐Valence Compounds: A Playground for Electrons and Holes

Organic Mixed‐Valence Compounds: A Playground for Electrons and Holes

Stable Luminescent Radicals and Radical-Based LEDs with Doublet Emission

Organische gemischtvalente Verbindungen: ein Spielplatz für Elektronen und Löcher

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