Electronic Decoupling in Ground and Excited States of Asymmetric Biaryls

Baumgarten, Martin; Gherghel, Lileta; Friedrich, Jan O.; Jurczok, Martin; Rettig, Wolfgang

doi:10.1021/jp9932315

Cited by 39 publications

(25 citation statements)

References 36 publications

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“…Pyrene boronic acid was prepared according to a reported process. [18] Compound 1 was obtained by reacting 2,7-dibromofluorene and methyl iodide with sodium tert-butoxide. 2,7-Dibromofluorenone, which was obtained by bromination of fluorenone, reacted with the Grignard reagent of bromobenzene, then dehydrated to give compound 2 with the aid of acids.…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Non‐Doped Blue Organic Light‐Emitting Diodes Based on Fluorene Derivatives with High Thermal Stability

Tao

Peng

Zhang

et al. 2005

Adv Funct Materials

278

114

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A new series of blue‐light‐emitting fluorene derivatives have been synthesized and characterized. The fluorene derivatives have high fluorescence yields, good thermal stability, and high glass‐transition temperatures in the range 145–193 °C. Organic light‐emitting diodes (OLEDs) fabricated using the fluorene derivatives as the host emitter show high efficiency (up to 5.3 cd A–1 and 3.0 lm W–1) and bright blue‐light emission (Commission Internationale de L'Eclairage (CIE) coordinates of x = 0.16, y = 0.22). The performance of the non‐doped fluorene‐based devices is among the best fluorescent blue‐light‐emitting OLEDs. The good performance of the present blue OLEDs is considered to derive from: 1) appropriate energy levels of the fluorene derivatives for good carrier injection; 2) good carrier‐transporting properties; and 3) high fluorescence efficiency of the fluorene derivatives. These merits are discussed in terms of the molecular structures.

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Section: Resultsmentioning

confidence: 99%

Highly Efficient Non‐Doped Blue Organic Light‐Emitting Diodes Based on Fluorene Derivatives with High Thermal Stability

Tao

Peng

Zhang

et al. 2005

Adv Funct Materials

278

114

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“…In this seminal paper, the authors introduced a quasi-classical vector model to describe the interaction of two transition dipoles under various geometries. Recently, it has been reported that for a substituted bi-perylene, a dimer which is very similar to BPM, the dihedral angle between the two perylene moieties amounts to B701 [18]. First electronic structure optimisations for BPM arrive at a slightly higher value.…”

Section: Methodsmentioning

confidence: 99%

Investigation of molecular dimers by ensemble and single molecule spectroscopy

Christ

Petzke

Bordat

et al. 2002

Journal of Luminescence

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Investigation of molecular dimers by ensemble and single molecule spectroscopy Christ, Th.; Petzke, F.; Bordat, P.; Herrmann, Andreas; Reuther, E.; Müllen, K.; Basché, Th. Link to publication in University of Groningen/UMCG research database Citation for published version (APA): Christ, T., Petzke, F., Bordat, P., Herrmann, A., Reuther, E., Müllen, K., & Basché, T. (2002). Investigation of molecular dimers by ensemble and single molecule spectroscopy. Journal of Luminescence, 98, 23-33. CopyrightOther than for strictly personal use, it is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license (like Creative Commons).Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. AbstractWe have investigated molecular dimers with different electronic coupling strengths by bulk and single molecule spectroscopy. In one of the dimers the two monomers (perylene-monoimide) are directly connected via a single bond while in the other one they are separated by the benzil motif. The close proximity of the monomers in the first case gives rise to excitonic band splitting which is clearly observable in the bulk absorption spectra. For the benzil structure the electronic interactions are governed by F .orster-type energy hopping between the monomers. Fluorescence intensity trajectories at the single molecule level show one-step and two-step bleaching behaviour which appears to be very similar for both dimers. However, emission spectra recorded simultaneously with the trajectories indicate spectral changes which allow to distinguish between weakly and strongly coupled dimers. In the latter case the spectral shape changes significantly when excitonic coupling has been lifted because of photochemical transformation of one of the monomers. r

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“…There have only been two previous reports of the application of SCC to this synthesis. [41,42] Borylation of the commercially available 1-bromopyrene 1 and subsequent esterification of the crude free boronic acid 2 with pinacol gave the boronic ester 3 in 80% yield based on 1 (Scheme 1). Compound 3 was prepared on a 25 g scale.…”

Section: Synthesismentioning

confidence: 99%