The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Qichun Zhang - One of the best experts on this subject based on the ideXlab platform.
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Thiadizoloquinoxaline-Based N‑Heteroacenes as Active Elements for High-Density Data-Storage Device
2018Co-Authors: Zilong Wang, Cheng Zhang, Wangqiao Chen, Qichun ZhangAbstract:A novel thiadiazoloquinoxaline (TQ)-based donor–acceptor (D–A)-type N-Heteroacene (Py-1-TQ) has been demonstrated for promising applications in organic multilevel resistive memory devices. Compared with its counterparts (Py-0-TQ and Py-2-TQ), which show flash-type binary memory behaviors, Py-1-TQ exhibits excellent nonvolatile write-once-read-many-times-type ternary memory effects with high ON2/ON1/OFF current ratios (105.8:103.4:1), which can be attributed to the different electron-withdrawing abilities between the pyrazine unit and TQ species that can induce stepwise D–A charge-transfer processes. These results suggest that TQ-based N-Heteroacenes can be potentially useful in ultrahigh-density data-storage devices through the rational D–A tuning
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a large pyrene fused n Heteroacene fifteen aromatic six membered rings annulated in one row
Chemical Communications, 2017Co-Authors: Zilong Wang, Guangfeng Liu, Huiying Yao, Ganguly Rakesh, Jia Zhu, Qichun ZhangAbstract:Here, we present our recent progress on the synthesis, crystal structure, physical properties and DFT calculations of a novel large pyrene-fused N-Heteroacene (15RINGS) with 15 aromatic six-membered rings linearly fused in one row. The long conjugated backbone (more than 35 A) of 15RINGS possesses a dual-bending feature (the bending angle is about 13.2°).
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Synthesis, Full Characterization, and Field Effect Transistor Behavior of a Stable Pyrene-Fused N‑Heteroacene with Twelve Linearly Annulated Six-Membered Rings
2017Co-Authors: Zongrui Wang, Zilong Wang, Guangfeng Liu, Huiying Yao, Jia Zhu, Qichun ZhangAbstract:Synthesis, Full Characterization, and Field Effect Transistor Behavior of a Stable Pyrene-Fused N‑Heteroacene with Twelve Linearly Annulated Six-Membered Ring
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synthesis characterization and non volatile memory device application of an n substituted Heteroacene
Chemistry-an Asian Journal, 2014Co-Authors: Chengyuan Wang, Jiangxin Wang, Junkuo Gao, Si Yu Tan, Weiwei Xiong, Pooi See Lee, Yanli Zhao, Qichun ZhangAbstract:N-substituted Heteroacenes have been widely used as electroactive layers in organic electronic devices, and only a few of them have been investigated in organic resistive memory devices. Here, a novel N-substituted Heteroacene 2-(4'-(diphenylamino)phenyl)-4,11-bis((triisopropylsilyl)ethynyl)-1H-imidazo[4,5-b]phenazine (DBIP) has been designed, synthesized, and characterized. Sandwich-structure memory devices based on DBIP have been fabricated and the devices show non-volatile and stable memory character with good endurance performance.
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synthesis characterization and nonvolatile ternary memory behavior of a larger Heteroacene with nine linearly fused rings and two different heteroatoms
Journal of the American Chemical Society, 2013Co-Authors: Feng Zhou, Chengyuan Wang, Junkuo Gao, Qichun ZhangAbstract:To achieve ultrahigh density memory devices with the capacity of 3n or larger, organic materials with multilevel stable states are highly desirable. Here, we reported a novel larger stable Heteroacene, 2,3,13,14-tetradecyloxy-5,11,16,22-tetraaza-6,10,17,21-tetrachloro-7,9,18,20-tetraoxa-8,19-dicyanoenneacene (CDPzN), which has two different types of heteroatoms (O and N) and nine linearly fused rings. The sandwich-structure memory devices based on CDPzN exhibited excellent ternary memory behaviors with high ON2/ON1/OFF current ratios of 106.3/104.3/1 and good stability for these three states.
Chengyuan Wang - One of the best experts on this subject based on the ideXlab platform.
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synthesis characterization and non volatile memory device application of an n substituted Heteroacene
Chemistry-an Asian Journal, 2014Co-Authors: Chengyuan Wang, Jiangxin Wang, Junkuo Gao, Si Yu Tan, Weiwei Xiong, Pooi See Lee, Yanli Zhao, Qichun ZhangAbstract:N-substituted Heteroacenes have been widely used as electroactive layers in organic electronic devices, and only a few of them have been investigated in organic resistive memory devices. Here, a novel N-substituted Heteroacene 2-(4'-(diphenylamino)phenyl)-4,11-bis((triisopropylsilyl)ethynyl)-1H-imidazo[4,5-b]phenazine (DBIP) has been designed, synthesized, and characterized. Sandwich-structure memory devices based on DBIP have been fabricated and the devices show non-volatile and stable memory character with good endurance performance.
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synthesis characterization and nonvolatile ternary memory behavior of a larger Heteroacene with nine linearly fused rings and two different heteroatoms
Journal of the American Chemical Society, 2013Co-Authors: Feng Zhou, Chengyuan Wang, Junkuo Gao, Qichun ZhangAbstract:To achieve ultrahigh density memory devices with the capacity of 3n or larger, organic materials with multilevel stable states are highly desirable. Here, we reported a novel larger stable Heteroacene, 2,3,13,14-tetradecyloxy-5,11,16,22-tetraaza-6,10,17,21-tetrachloro-7,9,18,20-tetraoxa-8,19-dicyanoenneacene (CDPzN), which has two different types of heteroatoms (O and N) and nine linearly fused rings. The sandwich-structure memory devices based on CDPzN exhibited excellent ternary memory behaviors with high ON2/ON1/OFF current ratios of 106.3/104.3/1 and good stability for these three states.
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a novel Heteroacene 2 2 3 4 5 tetrafluorophenyl 1h imidazo 4 5 b phenazine as a multi response sensor for f detection
Tetrahedron Letters, 2013Co-Authors: Chengyuan Wang, Qichun ZhangAbstract:Abstract A novel Heteroacene, 2-(2,3,4,5-tetrafluorophenyl)-1H-imidazo[4,5-b]phenazine has been successfully synthesized. The Heteroacene can selectively detect F− over Cl−, Br−, I−, NO3−, HSO4−, ClO4−, and BF4− in organic solvents through colorimetric and fluorescent responses. The interaction between the Heteroacene and F− was investigated through UV–Vis, fluorescence, and 1H NMR titration experiments, which suggested that the effects might occur via a combined process including hydrogen bond, deprotonation, and anion–π interactions between the sensor and F−.
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Synthesis, Characterization, and Nonvolatile Ternary Memory Behavior of a Larger Heteroacene with Nine Linearly Fused Rings and Two Different Heteroatoms
2013Co-Authors: Feng Zhou, Chengyuan Wang, Junkuo Gao, Qichun ZhangAbstract:To achieve ultrahigh density memory devices with the capacity of 3n or larger, organic materials with multilevel stable states are highly desirable. Here, we reported a novel larger stable Heteroacene, 2,3,13,14-tetradecyloxy-5,11,16,22-tetraaza-6,10,17,21-tetrachloro-7,9,18,20-tetraoxa-8,19-dicyanoenneacene (CDPzN), which has two different types of heteroatoms (O and N) and nine linearly fused rings. The sandwich-structure memory devices based on CDPzN exhibited excellent ternary memory behaviors with high ON2/ON1/OFF current ratios of 106.3/104.3/1 and good stability for these three states
Timothy Noel - One of the best experts on this subject based on the ideXlab platform.
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visible light photocatalytic difluoroalkylation induced 1 2 heteroarene migration of allylic alcohols in batch and flow
Journal of Organic Chemistry, 2018Co-Authors: Xiaojing Wei, Timothy NoelAbstract:A convenient method for the preparation of sp3-rich heterocycles is reported. The method comprises a photocatalytic difluoroalkylation-induced 1,2-heteroarene migration of allylic alcohols. Here we describe for the first time the benefits of using flow to facilitate such migration reactions, including shorter reaction times, higher selectivities, and opportunities to scale the chemistry.
Li Qiu - One of the best experts on this subject based on the ideXlab platform.
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reductive ring closure methodology toward Heteroacenes bearing a dihydropyrrolo 3 2 b pyrrole core scope and limitation
ChemInform, 2015Co-Authors: Li Qiu, Na Zhao, Xiao Wang, Xuhui Zhuang, Zhenggang Lan, Lirong Wen, Xiaobo WanAbstract:A newly developed reductive ring closure methodology to Heteroacenes bearing a dihydropyrrolo[3,2-b]pyrrole core was systematically studied for its scope and limitation. The methodology involves (i) the cyclization of an o-aminobenzoic acid ester derivative to give an eight-membered cyclic dilactam, and (ii) the conversion of the dilactams into the corresponding diimidoyl chloride, which undergoes (iii) reductive ring closure to install the dihydropyrrolo[3,2-b]pyrrole core. The first step of the methodology plays the key role due to its substrate limitation, which suffers from the competition of oligomerization and hydrolysis. All the dilactams could successfully convert to the corresponding diimidoyl chlorides, most of which succeeded to give the dihydropyrrolo[3,2-b]pyrrole core. The influence of the substituents and the elongation of conjugated length on the photophysical properties of the obtained Heteroacenes were then investigated systematically using UV-vis spectroscopy and cyclic voltammetry. It was found that chlorination and fluorination had quite a different effect on the photophysical properties of the Heteroacene, and the ring fusing pattern also had a drastic influence on the band gap of the Heteroacene. The successful preparation of a series of Heteroacenes bearing a dihydropyrrolo[3,2-b]pyrrole core would provide a wide variety of candidates for further fabrication of organic field-effect transistor devices.
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Antiaromatic Characteristic Analysis of 1,4-Diazapentalene Derivatives: A Theoretical Study
2015Co-Authors: Zheng Jie, Li Qiu, Zhuang Xuhui, Yu Xie, Wan Xiaobo, Lan ZhenggangAbstract:1,4-Diazapentalene Heteroacenes are potential n-type semiconductors that could be used as a new type of material for organic field-effect transistors (OFETs), but their synthesis is still challenging due to their antiaromaticity. The study on their structure-stability relationship should provide useful guidance to the design of stable diazapentalenes. We examined the stability of several types of Heteroacenes hearing the 1,4-diazapentalene core using NICS(1)(zz) calculations. The influence of the fusion pattern, the introduction of substituents, and the incorporation of other heterocycles on the antiaromaticity of the central 1,4-diazapentalene core was systematically studied. It was found that the linear fusion of aromatic rings to the antiaromatic core increases the stability of the Heteroacene. The fusion of electron-poor heterocyclic rings also enhances the stability effectively, Whereas the fusion of electron-rich heterocyclic rings destabilizes the system. In addition, the combination of the linear fusion pattern or introduction of electron-poor heterocyclic rings to the antiaromatic core reduces the reorganization energy for electron transport, suggesting a way to achieve better n-type semiconductors
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Antiaromatic Characteristic Analysis of 1,4-Diazapentalene Derivatives: A Theoretical Study
2015Co-Authors: Jie Zheng, Xiaobo Wan, Li Qiu, Xuhui Zhuang, Yu Xie, Zhenggang LanAbstract:1,4-Diazapentalene Heteroacenes are potential n-type semiconductors that could be used as a new type of material for organic field-effect transistors (OFETs), but their synthesis is still challenging due to their antiaromaticity. The study on their structure–stability relationship should provide useful guidance to the design of stable diazapentalenes. We examined the stability of several types of Heteroacenes bearing the 1,4-diazapentalene core using NICS(1)zz calculations. The influence of the fusion pattern, the introduction of substituents, and the incorporation of other heterocycles on the antiaromaticity of the central 1,4-diazapentalene core was systematically studied. It was found that the linear fusion of aromatic rings to the antiaromatic core increases the stability of the Heteroacene. The fusion of electron-poor heterocyclic rings also enhances the stability effectively, whereas the fusion of electron-rich heterocyclic rings destabilizes the system. In addition, the combination of the linear fusion pattern or introduction of electron-poor heterocyclic rings to the antiaromatic core reduces the reorganization energy for electron transport, suggesting a way to achieve better n-type semiconductors
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Reductive Ring Closure Methodology toward Heteroacenes Bearing a Dihydropyrrolo[3,2‑b]pyrrole Core: Scope and Limitation
2014Co-Authors: Li Qiu, Na Zhao, Xiao Wang, Xuhui Zhuang, Zhenggang Lan, Lirong Wen, Xiaobo WanAbstract:A newly developed reductive ring closure methodology to Heteroacenes bearing a dihydropyrrolo[3,2-b]pyrrole core was systematically studied for its scope and limitation. The methodology involves (i) the cyclization of an o-aminobenzoic acid ester derivative to give an eight-membered cyclic dilactam, and (ii) the conversion of the dilactams into the corresponding diimidoyl chloride, which undergoes (iii) reductive ring closure to install the dihydropyrrolo[3,2-b]pyrrole core. The first step of the methodology plays the key role due to its substrate limitation, which suffers from the competition of oligomerization and hydrolysis. All the dilactams could successfully convert to the corresponding diimidoyl chlorides, most of which succeeded to give the dihydropyrrolo[3,2-b]pyrrole core. The influence of the substituents and the elongation of conjugated length on the photophysical properties of the obtained Heteroacenes were then investigated systematically using UV–vis spectroscopy and cyclic voltammetry. It was found that chlorination and fluorination had quite a different effect on the photophysical properties of the Heteroacene, and the ring fusing pattern also had a drastic influence on the band gap of the Heteroacene. The successful preparation of a series of Heteroacenes bearing a dihydropyrrolo[3,2-b]pyrrole core would provide a wide variety of candidates for further fabrication of organic field-effect transistor devices
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An expedient synthesis of fused Heteroacenes bearing a pyrrolo[3,2-b]pyrrole core
Chemical Communications, 2012Co-Authors: Li Qiu, Chunmeng Yu, Xiaobo Wan, Renqiang Yang, Weichao Chen, Yunlong Guo, Na Zhao, Yunqi LiuAbstract:Two linear fused Heteroacenes bearing a pyrrolo[3,2-b]pyrrole core have been synthesized via a novel reductive ring closure methodology in three steps and in good overall yield. Preliminary OFET results showed that dinaphtho[2,3-b:2',3'-f]pyrrolo[3,2-b]pyrrole (DNPP) is a potential candidate for organic electronics.
Yunqi Liu - One of the best experts on this subject based on the ideXlab platform.
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An expedient synthesis of fused Heteroacenes bearing a pyrrolo[3,2-b]pyrrole core
Chemical Communications, 2012Co-Authors: Li Qiu, Chunmeng Yu, Xiaobo Wan, Renqiang Yang, Weichao Chen, Yunlong Guo, Na Zhao, Yunqi LiuAbstract:Two linear fused Heteroacenes bearing a pyrrolo[3,2-b]pyrrole core have been synthesized via a novel reductive ring closure methodology in three steps and in good overall yield. Preliminary OFET results showed that dinaphtho[2,3-b:2',3'-f]pyrrolo[3,2-b]pyrrole (DNPP) is a potential candidate for organic electronics.
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Anthra[2,3-b]benzo[d]thiophene: An air-stable asymmetric organic semiconductor with high mobility at room temperature
Chemistry of Materials, 2008Co-Authors: Chunyan Du, Wenfeng Qiu, Hengjun Zhang, Ting Qi, Yunqi Liu, Yunlong Guo, Xike Gao, Ying Liu, Kun Lu, Gui YuAbstract:An asymmetric Heteroacene compound anthra[2,3-b]benzo[d]thiophene has been facilely synthesized. FETs fabricated with the compound exhibit a mobility as high as 0.41 cm2 V−1 s−1 at room temperature. High mobility and good stability suggest that exploration of asymmetric organic semiconductors would be extremely promising for the application in organic electronics.