Electronic Control of the Scholl Reaction: Selective Synthesis of Spiro vs Helical Nanographenes
作者:Patricia Izquierdo‐García、Jesús M. Fernández‐García、Josefina Perles、Israel Fernández、Nazario Martín
DOI:10.1002/anie.202215655
日期:2023.2.6
The electronic nature of the starting substrate decides the fate of the reaction: Anthracene-based polyphenylenes lead to less-known spiro (R=H) or helical (R=F) nanographenes under mild Scholl conditions, depending upon the substitution pattern on the anthracene core. DFT calculations reveal that the formation, or not, of the trityl cation is the key issue.
Synthesis and Electro-Optical Properties of 9,10-Substituted Anthracene Derivatives for Flexible OLED Devices
作者:Yoon Soo Han、Seonju Jeong、Sang Chul Ryu、Eun Jung Park、Eon Joo Lyu、Giseop Kwak、Lee Soon Park
DOI:10.1080/15421400903196245
日期:2009.11.11
A silylated anthracene derivative, bis[2-(p-trimethylsilyl)phenylethynyl]anthracene (1), was synthesized by using Sonogashira reaction. Compound 1 showed two absorption maxia(lambda(max, abs)) at 444 and 447 nm, and fluorescence maximum (lambda(max, em)) at 478 nm. Compound 1 had higher melting temperature of 274 degrees C compared to anthracene 210 degrees C presumably due to confinement of pi-conjugated system by trimethylsilyl end-capping, which will be beneficial in the high temperature operation condition of OLED devices. As compared to the commercially available, blue-light emitting, material 4 and tert-butylated compound 2, the compound 1 showed small red-shift of 9 nm in the OLED emission from the by PL lambda(max) due to the increased electron density in the anthracene ring. The compound 1 was also found to be easily fabricated in the flexible OLED devices and showed a low threshold voltage and high current efficiency compared with other anthracene derivatives.
Reversible Photooxygenation of Alkynylanthracenes: Chemical Generation of Singlet Oxygen under Very Mild Conditions
作者:Werner Fudickar、Torsten Linker
DOI:10.1002/chem.201102230
日期:2011.12.2
In the dark and very fast: The generation of singlet oxygen (1O2) from endoperoxides, which are readily available by photooxygenation of the corresponding anthracenes, proceeds within minutes in the dark (see scheme), a rate hitherto unknown for other anthracenes or naphthalenes. This provides an efficient chemical source of singlet oxygen under very mildconditions.
在黑暗中并且非常快:在黑暗中,几分钟内即可从内过氧化物中产生单线态氧(1 O 2),这些光可通过相应的蒽的光氧化而容易地获得(见方案),这是其他蒽或其他蒽迄今所未知的速率萘。这在非常温和的条件下提供了有效的单重态氧化学来源。
Why Triple Bonds Protect Acenes from Oxidation and Decomposition
作者:Werner Fudickar、Torsten Linker
DOI:10.1021/ja306056x
日期:2012.9.12
Furthermore, the products obtained from thermolysis and the kinetics of the thermolysis are investigated. Density functional theory is applied in order to predict reaction energies, frontier molecular orbital interactions, and radical stabilization energies. The combined results allow us to describe the mechanisms of the oxidations and the subsequent thermolysis. We found that the alkynyl group not only