共查询到20条相似文献,搜索用时 31 毫秒
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Dr. Cyril Poriel Dr. Joëlle Rault‐Berthelot Dr. Sébastien Thiery Dr. Cassandre Quinton Dr. Olivier Jeannin Urelle Biapo Dr. Denis Tondelier Bernard Geffroy 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(50):17930-17935
A new electron‐rich fragment, namely the quinolinophenothiazine (QPTZ) is reported. The QPTZ fragment incorporated in spiroconfigured materials leads to higher performance in blue Phosphorescent OLEDs than structurally related phenylacridine and indoloacridine based materials (increasing the HOMO energy level, modulating the spin‐orbit coupling, etc.) and leads to highly efficient blue phosphorescent organic light emitting diodes, indicating the strong potential of this new molecular fragment in organic electronics. 相似文献
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Water‐soluble three‐dimensional (3D) polymers are structurally ideal for the construction of ordered porous materials for in‐situ and tunable loading and release of guests. For many years, studies on ordered porous materials have been confined to crystalline solids. Since 2014, self‐assembly has been developed as a robust strategy for the preparation of water‐soluble 3D polymers that possess defined and intrinsic porosity. Through the encapsulation of cucurbit[8]uril for aromatic dimers, ordered diamondoid supramolecular organic frameworks can be assembled from tetrahedral monomers. With [Ru(bipy)3]2+‐derived octahedral complexes as precursors, cubic supramolecular metal‐organic frameworks have been assembled. One supramolecular organic framework has also been utilized to prepare the first homogeneous covalent organic framework through the [2+2] alkene cycloaddition, whereas the quantitative formation of the hydrazone bonds can be utilized to synthesize flexible porous organic frameworks. The new water‐soluble ordered and flexible polymeric frameworks are able to include drugs and biomacromolecules to accomplish in situ loading and intracellular delivery and to enrich photosensitizers and catalysts to enhance discrete visible light‐induced reactions. This review highlights the advances. 相似文献
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Dr. Xiao‐Feng Wu 《化学:亚洲杂志》2012,7(11):2502-2509
The advantages of zinc catalysts, such as their low toxicity, low cost, and environmentally benignity, are encouraging organic chemists to explore their applications in organic synthesis. As a non‐redox metal, zinc catalysts have been investigated in redox reactions over the past few decades. Because of the importance of redox reactions, the interest in zinc catalysts, and the fact that no review on zinc‐catalyzed redox reactions has been published, herein, I have collected and summarized the main contributions in this area. This review is divided into two parts: reduction reactions and oxidation reactions. 相似文献
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Dye‐Incorporated Polynaphthalenediimide Acceptor for Additive‐Free High‐Performance All‐Polymer Solar Cells 下载免费PDF全文
Dong Chen Jia Yao Lie Chen Jingping Yin Ruizhi Lv Bin Huang Siqi Liu Zhi‐Guo Zhang Chunhe Yang Yiwang Chen Yongfang Li 《Angewandte Chemie (International ed. in English)》2018,57(17):4580-4584
All‐polymer solar cells (all‐PSCs) can offer unique advantages for applications in flexible devices, and naphthalene diimide (NDI)‐based polymer acceptors are the widely used polymer acceptors. However, their power conversion efficiency (PCE) still lags behind that of state‐of‐the‐art polymer solar cells, due to low light absorption, suboptimal energy levels and the strong aggregation of the NDI‐based polymer acceptor. Herein, a rhodanine‐based dye molecule was introduced into the NDI‐based polymer acceptor by simple random copolymerization and showed an improved light absorption coefficient, an up‐shifted lowest unoccupied molecular orbital level and reduced crystallization. Consequently, additive‐free all‐PSCs demonstrated a high PCE of 8.13 %, which is one of the highest performance characteristics reported for all‐PSCs to date. These results indicate that incorporating a dye into the n‐type polymer gives insight into the precise design of high‐performance polymer acceptors for all‐PSCs. 相似文献
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Inside Back Cover: Site‐Selective Synthesis of Janus‐type Metal‐Organic Framework Composites (Angew. Chem. Int. Ed. 15/2014) 下载免费PDF全文
Sudarat Yadnum Dr. Jérome Roche Eric Lebraud Philippe Négrier Patrick Garrigue Dr. Darren Bradshaw Dr. Chompunuch Warakulwit Prof. Jumras Limtrakul Prof. Alexander Kuhn 《Angewandte Chemie (International ed. in English)》2014,53(15):4007-4007
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Herein, the photophysical, morphological, optical gain characteristics of a set of trigonal monodisperse starburst conjugated macromolecules ( Tr1‐Tr4 ) have been systematically investigated in order to elucidate the influence of the molecular structures on their optoelectronic performance. With increasing the oligofluorene arm length, absorption spectra were red‐shifted progressively, whereas an increase in photoluminescence quantum yields (PLQYs) and optical gain coefficients, and a corresponding reduction in amplified spontaneous emission (ASE) thresholds and loss coefficients were observed for Tr1‐Tr3 except for Tr4 . The results indicate that the effective conjugation length become saturated for Tr3 in this system. Impressively, the resulting molecules manifested very low ASE thresholds (4.4–11.6 μJ cm?2) with high photostability, as well as high thermal stability. One dimensional distributed feedback (DFB) lasers exhibited a minimum lasing threshold of 10.38 nJ pulse?1 (0.86 kW cm?2, 4.325 μJ cm?2) for Tr3 . It should be emphasized that the ASE threshold of Tr1‐Tr4 was nearly unchanged from room temperature to 200 °C. The results suggest that this kind of truxene‐cored conjugated starbursts with high photostability and low lasing thresholds are rather promising gain media for organic semiconductor lasers. 相似文献
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Cover Picture: A General Method for Growing Two‐Dimensional Crystals of Organic Semiconductors by “Solution Epitaxy” (Angew. Chem. Int. Ed. 33/2016) 下载免费PDF全文
Chunhui Xu Dr. Ping He Dr. Jie Liu Dr. Ajuan Cui Dr. Huanli Dong Dr. Yonggang Zhen Prof. Wei Chen Prof. Wenping Hu 《Angewandte Chemie (International ed. in English)》2016,55(33):9443-9443
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Dithienoindophenines: p‐Type Semiconductors Designed by Quinoid Stabilization for Solar‐Cell Applications 下载免费PDF全文
Longbin Ren Dr. Haijun Fan Dazhen Huang Dafei Yuan Prof. Dr. Chong‐an Di Prof. Dr. Xiaozhang Zhu 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(48):17136-17140
Compared with the dominant aromatic conjugated materials, photovoltaic applications of their quinoidal counterparts featuring rigid and planar molecular structures have long been unexplored despite their narrow optical bandgaps, large absorption coefficients, and excellent charge‐transport properties. The design and synthesis of dithienoindophenine derivatives (DTIPs) by stabilizing the quinoidal resonance of the parent indophenine framework is reported here. Compared with the ambipolar indophenine derivatives, DTIPs with the fixed molecular configuration are found to be p‐type semiconductors exhibiting excellent unipolar hole mobilities up to 0.22 cm2 V?1 s?1, which is one order of magnitude higher than that of the parent IP‐O and is even comparable to that of QQT(CN)4‐based single‐crystal field‐effect transistors (FET). DTIPs exhibit better photovoltaic performance than their aromatic bithieno[3,4‐b]thiophene (BTT) counterparts with an optimal power‐conversion efficiency (PCE) of 4.07 %. 相似文献
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Dr. Yuan Jay Chang Po‐Ting Chou Szu‐Yu Lin Dr. Motonori Watanabe Zhi‐Qian Liu Ju‐Ling Lin Prof. Dr. Kew‐Yu Chen Prof. Dr. Shih‐Sheng Sun Prof. Dr. Ching‐Yang Liu Prof. Dr. Tahsin J. Chow 《化学:亚洲杂志》2012,7(3):572-581
A series of organic dyes were prepared that displayed remarkable solar‐to‐energy conversion efficiencies in dye‐sensitized solar cells (DSSCs). These dyes are composed of a 4‐tert‐butylphenylamine donor group (D), a cyanoacrylic‐acid acceptor group (A), and a phenylene‐thiophene‐phenylene (PSP) spacer group, forming a D‐π‐A system. A dye containing a bulky tert‐butylphenylene‐substituted carbazole (CB) donor group showed the highest performance, with an overall conversion efficiency of 6.70 %. The performance of the device was correlated to the structural features of the donor groups; that is, the presence of a tert‐butyl group can not only enhance the electron‐donating ability of the donor, but can also suppress intermolecular aggregation. A typical device made with the CB‐PSP dye afforded a maximum photon‐to‐current conversion efficiency (IPCE) of 80 % in the region 400–480 nm, a short‐circuit photocurrent density Jsc=14.63 mA cm?2, an open‐circuit photovoltage Voc=0.685 V, and a fill factor FF=0.67. When chenodeoxycholic acid (CDCA) was used as a co‐absorbent, the open‐circuit voltage of CB‐PSP was elevated significantly, yet the overall performance decreased by 16–18 %. This result indicated that the presence of 4‐tert‐butylphenyl substituents can effectively inhibit self‐aggregation, even without CDCA. 相似文献
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《化学:亚洲杂志》2018,13(18):2587-2600
The fusion of heteroaromatic rings into ladder‐type heteroarenes can stabilize frontier molecular orbitals and lead to improved physicochemical properties that are beneficial for applications in various optoelectronic devices. Thus, ladder‐type heteroarenes, which feature highly planar backbones and well‐delocalized π conjugation, have recently emerged as a promising type of organic semiconductor with excellent device performance in organic photovoltaics (OPVs) and organic field‐effect transistors (OFETs). In this Focus Review, we summarize the recent advances in ladder‐type heteroarene‐based organic semiconductors, such as hole‐ and electron‐transporting molecular semiconductors, and fully ladder‐type conjugated polymers towards their applications in OPVs and OFETs. The recent use of ladder‐type small‐molecule acceptor materials has strikingly boosted the power conversion efficiency of fullerene‐free solar cells, and selected examples of the latest developments in ladder‐type fused‐ring electron acceptor materials are also elaborated. 相似文献
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Synthesis and Elaboration of All‐cis‐1,2,4,5‐Tetrafluoro‐3‐Phenylcyclohexane: A Polar Cyclohexane Motif 下载免费PDF全文
Dr. Alastair J. Durie Dr. Tomoya Fujiwara Rodrigo Cormanich Prof. Michael Bühl Prof. Alexandra M. Z. Slawin Prof. David O'Hagan 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(21):6259-6263
A stereocontrolled synthesis of all‐cis‐1,2,4,5‐ tetrafluoro‐3‐phenylcyclohexane is developed as the first functionalised example of this polar cyclohexane motif. The dipolar nature of the ring, arising due to two 1,3‐diaxial C?F bonds, is revealed in the solid‐state (X‐ray) structure. The orthogonal conformation of the aryl and cyclohexyl rings in all‐cis‐1,2,4,5‐tetrafluoro‐3‐phenylcyclohexane, and in an ortho‐nitro derivative, result in intramolecular 1hJHF and 2hJCF NMR couplings relayed through hydrogen bonding. The aryl group of all‐cis‐1,2,4,5‐tetrafluoro‐3‐phenylcyclohexane is elaborated in different ways to demonstrate the versatility of this compound for delivering the motif to a range of molecular building blocks. 相似文献
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Sowmya Padejjar Vasantha Boja Poojary Revanasiddappa Bistuvalli Chandrashekarappa 《中国化学会会志》2019,66(6):638-650
In view of developing novel bioactive compounds, a series of 2‐(5‐[2‐methyl‐6‐arylpyridin‐3‐yl]‐1,3,4‐oxadiazol‐2‐ylthio)‐1‐arylethanones (6a–n) were designed and synthesized in good yield. Novel compounds were evaluated for their antibacterial and anti‐inflammatory activities. All synthesized compounds were screened for their antibacterial activity against Staphylococcus aureus, Bascillus subtilis, Eschericia coli, and Pseudomonas aeruginosa strains. Compounds 6a , 6b , 6c , 6h , and 6i displayed the highest antibacterial activity with minimal inhibitory concentration (MIC) values ranging from 6.25–12.5 μg/mL in comparison with the standard Ciprofloxacin. The results of anti‐inflammatory activity of carrageenan‐induced footpad edema assay indicated that tested compounds exhibited remarkable anti‐inflammatory activity with percentage of inhibition of 63.9–70.1% (potency 96.8–106.20% of indomethacin activity) after 3 hr. Particularly, 6c – e and 6j – l were found to be excellent inhibitors of inflammation, with potential higher than that of the standard, Indomethacin. 相似文献
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Dr. Liang‐Hsiang Chen Tarng‐Shiang Hu Dr. Peng‐Yi Huang Prof. Choongik Kim Ching‐Hao Yang Juin‐Jie Wang Dr. Jing‐Yi Yan Dr. Jia‐Chong Ho Dr. Cheng‐Chung Lee Prof. Ming‐Chou Chen 《Chemphyschem》2013,14(12):2772-2776
A solution‐processed anthradithiophene derivative, 5,11‐bis(4‐triethylsilylphenylethynyl)anthradithiophene (TESPE‐ADT), is studied for use as the semiconducting material in thin‐film transistors (TFTs). To enhance the electrical performance of the devices, two different kinds of solution processing (spin‐coating and drop‐casting) on various gate dielectrics as well as additional post‐treatment are employed on thin films of TESPE‐ADT, and p‐channel OTFT transport with hole mobilities as high as ~0.12 cm2 V?1 s?1 are achieved. The film morphologies and formed microstructures of the semiconductor films are characterized in terms of film processing conditions and are correlated with variations in device performance. 相似文献
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Metal‐Substituted Zeolitic Imidazolate Framework ZIF‐108: Gas‐Sorption and Membrane‐Separation Properties 下载免费PDF全文
Yujie Ban Prof. Dr. Yanshuo Li Yuan Peng Hua Jin Wenmei Jiao Dr. Xinlei Liu Prof. Dr. Weishen Yang 《Chemistry (Weinheim an der Bergstrasse, Germany)》2014,20(36):11402-11409
A series of dual‐metal zeolitic imidazolate framework (ZIF) crystals with SOD and RHO topologies was synthesised by metal substitution from ZIF‐108 (Zn(2‐nitroimidazolate)2, SOD topology) as the parent material. This was based on the concept that metal substitution of ZIF‐108 requires a much lower activation energy than homogenous nucleation owing to the metastability of ZIF‐108. In‐depth investigations of the formation processes of the daughter ZIFs indicated that the transformation of ZIF‐108 is a dissolution/heterogeneous nucleation process. Typical isostructural Co2+ substitution mainly occurs at the outer surface of ZIF‐108 and results in a core–shell structure. On the contrary, the Cu2+‐substituted ZIF has a RHO topology with a homogeneous distribution of Cu2+ ions in the structure. Substitution with Ni2+ resulted in a remarkable enhancement in adsorption selectivity toward CO2 over N2 by a factor of up to 227. With Co2+‐substituted nanoparticles as inorganic filler, a mixed matrix membrane based on polysulfone displayed greatly improved performance in the separation of H2/CH4, CO2/N2 and CO2/CH4. 相似文献
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Inside Cover: An Extra‐Large‐Pore Zeolite with 24×8×8‐Ring Channels Using a Structure‐Directing Agent Derived from Traditional Chinese Medicine (Angew. Chem. Int. Ed. 22/2018) 下载免费PDF全文
Chuanqi Zhang Elina Kapaca Prof. Dr. Jiyang Li Prof. Dr. Yunling Liu Xianfeng Yi Prof. Dr. Anmin Zheng Prof. Dr. Xiaodong Zou Prof. Dr. Jiuxing Jiang Prof. Dr. Jihong Yu 《Angewandte Chemie (International ed. in English)》2018,57(22):6356-6356