103068-20-8Relevant articles and documents
Highly efficient dual anthracene core derivatives through optimizing side groups for blue emission
Lee, Hayoon,Jo, Minjin,Yang, Garam,Jung, Hyocheol,Kang, Seokwoo,Park, Jongwook
, p. 27 - 36 (2017)
TP-AA-TPB, TP-AA-TPB, TPB-AA-TPB, TP-AA-DPA, TP-AA-TPA, and TPB-AA-TPA were synthesized using a 9,9'-bianthracene (AA core). Through a systematic side group change, we optimized the dual-core chromophore system and investigated the relationship between the core and the side groups. The ultraviolet-visible (UV-Vis) absorption of the six materials showed an intrinsic absorption peaks of anthracene in the range of 360 nm–410 nm and photoluminescence (PL) emission in the blue region. The minimum decomposition temperatures (Td) was 425 °C, the minimum melting temperatures (Tm) was 335 °C, and the minimum glass transition temperatures (Tg) was 176 °C. We achieved excellent overall electroluminescence (EL) efficiency in non-doped OLED devices using the six synthesized materials as emitting layer (EML). TPB-AA-TPA synthesized through size and polarity optimization of the side groups on the AA core had a current efficiency of 8.97 cd/A, power efficiency of 4.43 lm/W, external quantum efficiency (EQE) of 6.37%, and Commission Internationale de L'Eclairage coordinates (CIE) of (0.14, 0.19). TPB-AA-TPA also maintained blue emission and realized the highest EL efficiency among the six synthesized materials.
Palladium Nanoparticles Supported on Poly(N-vinyl- imidazole-co-N-vinylcaprolactam) as an Effective Recyclable Catalyst for the Suzuki Reaction
Selivanova, Alexandra V.,Tyurin, Vladimir S.,Beletskaya, Irina P.
, p. 1278 - 1283 (2014)
A recyclable and effective polymer-immobilized ligandless palladium catalyst for the Suzuki reaction has been investigated. Palladium nanoparticles are formed in situ and stabilized by poly(N-vinylimidazole-co-N-vinylcaprolactam). A series of aryl bromides have been studied in the reaction with phenylboronic acid under mild conditions with water-alcohol systems as a solvent that complies with "Green Chemistry" demands. The catalyst can be recycled eight times without appreciable loss in activity and a low degree of palladium leaching. Kinetic studies reveal unusual behavior of the reaction; this can be explained on the basis of the observation of changes to the sizes of the particles during recycling, as determined by TEM results. The suggested mechanism of the reaction is in accordance with the concept of the role of leaching in the process. Fast or slow? Palladium nanoparticles immobilized on poly(N-vinylimidazole-co-N-vinylcaprolactam) reveal unusual kinetic behavior in the Suzuki reaction. This can be explained on the basis of the observation of changes to the sizes of the particles during recycling, and is in accordance with the concept of leaching during the process.
Synthesis and physical properties of new pyrene derivative with bulky side groups for blue emission
Jung, Mina,Lee, Jaehyun,Jung, Hyocheol,Park, Jongwook
, p. 8796 - 8799 (2016)
Organic light-emitting diodes (OLEDs) have attracted much attention from academia and industry field because of their various applications such as large area flat-panel displays and lightings. We designed and synthesized new pyrene derivative with 1,6-bis(3',5'-diphenylbiphenyl-4-yl)pyrene (1,6-DTBP) which has bulky side group for intra-twisted structure and blue emission. In solution state, 1,6-DTBP exhibited absorption maximum value of 365 nm and photoluminescence (PL) maximum value of 425 nm. In film state, 1,6-DTBP exhibited absorption maximum value of 373 nm and PL maximum value of 461 nm without excimer band. 1,6-DTBP can be applicable to OLED emitter as a blue emission.
Three-Dimensional Structures Based on the Fusion of Chrysene and Spirobifluorene Chromophores for the Development of Blue OLEDs
Lee, Hayoon,Jung, Hyocheol,Kang, Seokwoo,Heo, Jin Hyuck,Im, Sang Hyuk,Park, Jongwook
, p. 2640 - 2646 (2018)
A new deep-blue chromophore containing a three-dimensionally (3D) shaped CS core composed of fused chrysene and spirofluorene units is synthesized. A pair of m-terphenyl (TP) units is also substituted onto the CS core at two different sets of positions to
In-Line Monitoring and Spectral Analysis of Polymer Blend Dispersion in Microcompounder
Oh, Won Taek,Kim, Myung Ho,Do, Quyen,Cho, Namchul,Kim, Tae-Dong
, p. 75 - 81 (2019)
Microcompounders are the most common compounding machines for making polymer composites. The torque rheometry is an effective tool for predicting the processing characteristics of thermoplastic polymers. It provides continuous monitoring of torque and tem
Palladium-catalysed room-temperature Suzuki–Miyaura coupling in water extract of pomegranate ash, a bio-derived sustainable and renewable medium
Appa, Rama Moorhy,Prasad, S. Siva,Lakshmidevi, Jangam,Naidu, Bandameeda Ramesh,Narasimhulu, Manchala,Venkateswarlu, Katta
, (2019/08/12)
An agro waste-derived, ‘water extract of pomegranate ash’ (WEPA), has been utilized for the first time as a renewable medium for Pd(OAc)2-catalysed Suzuki–Miyaura cross-coupling at room temperature. This method offers a simple and sustainable synthesis of biaryls from aryl halides and arylboronic acids under ligand- and external base-free aerobic and ambient conditions. This method has been found effective for both activated and unactivated aryl halides in the production of biaryls with moderate to nearly quantitative yields. The protocol shows high chemoselectivity over identical/similar reactive sites in aryl halides (i.e. selectivity over identical halogens or different halogens of aryl halides). This method exhibits high regioselectivity, i.e. the selective reactivity of a halogen over other identical halogens at different positions on the aromatic nucleus. Therefore, we disclose here a clean, benign, substantial chemo- and regioselective and highly economic alternative method for the palladium-assisted synthesis of biaryls using an agro waste-derived medium.
