Synthesis, Characterization, and Nonvolatile Ternary Memory Behavior of a Larger Heteroacene with Nine Linearly Fused Rings and Two Different Heteroatoms
摘要:
To achieve ultrahigh density memory devices with the capacity of 3(n) 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 10(6.3)/10(4.3)/1 and good stability for these three states.
In Situ Synthesis of Hexakis(alkoxy)diquinoxalino[2,3-<i>a</i>:2‘,3‘-<i>c</i>]phenazines: Mesogenic Phase Transition of the Electron-Deficient Discotic Compounds
作者:Chi Wi Ong、Su-Chih Liao、Tsu Hsing Chang、Hsiu-Fu Hsu
DOI:10.1021/jo035840l
日期:2004.4.1
2,3,8,9,14,15-Hexakis(alkoxy)diquinoxalino[2,3-a:2‘,3‘-c]phenazines with alkyl side chains varying from 6 to 12 carbon atoms were readily synthesized by the condensation of hexaketocyclohexane with the respective 1,2-bisalkoxy-4,5-diaminobenzene. Polarization microscopy and DSC studies showed all these compounds to exhibit a very wide mesophase range of over 150 °C. An interesting Dhd to Drd transition
通过缩合反应很容易合成2,3,8,9,14,15-烷基侧链为6至12个碳原子的六(烷氧基)二喹喔啉[2,3- a:2',3'- c ]吩嗪六酮环己烷与各自的1,2-双烷氧基-4,5-二氨基苯。偏振显微镜和DSC研究表明,所有这些化合物的中间相范围都超过150°C。通过X射线衍射测量确定,辛基衍生物3b观察到有趣的D hd到D rd跃迁。己基衍生物显示出三个还原电位,这表明HATN核保持了其电子不足的特性,并被认为适合作为n掺杂的盘状液晶材料。六个烷氧基链的合并并没有覆盖HATN核心的电子缺乏。
Regioselective synthesis of the 4,5-dialkoxy-2-nitroanilines bearing two different alkoxy substituents
chemoselective synthesis of 4,5-dialkoxy-2-nitroanilines substituted with two alkoxys at C-4 and C-5. Here we show the optimization protocol of the transetherification reaction used to synthesize 20 newcompounds with good to excellent yields (50–92%). We describe a simple and efficient one-step procedure that can be applied to obtain a significant number of pharmacologicallyactivecompounds, including
Synthesis and Characterization of a Discotic Uranium-Containing Liquid Crystal
作者:Jonathan L. Sessler、Wyeth B. Callaway、Stephen P. Dudek、Richard W. Date、Duncan W. Bruce
DOI:10.1021/ic0492690
日期:2004.10.1
chains is described. These compounds are found to be liquid-crystalline and form columnar mesophases, as judged from polarizing optical microscopy studies, and represent the first uranium-containing discotic mesogens.
Liquid crystalline derivatives for electronic devices
申请人:UNIVERSITE LIBRE DE BRUXELLES
公开号:EP1365002A1
公开(公告)日:2003-11-26
The present invention is related to a device comprising a liquid crystalline poly-aza-trinaphthylene derivatives of the structure I:
wherein A is C-R or N (nitrogen), and B is R1
R is hydrogen (H) or deuterium (D)
halogen (F, Cl, Br or I)
nitro (NO2)
nitryl (CN)
R1 is ether (O-R2)
ester (O-CO- R2 or CO-O- R2)
alkyl (R2)
alkyne (C C- R2)
phenyl (mono, di or tri substituted by above-mentioned R2 groups)
with R2 being an alkyl, branched or not, an oligoether, or a combination of both, of 5 to 20 carbon atoms.
Effect of Phthalimide in 2,1,3-Benzooxadiazole Based Copolymer on the Performances of Solar Cells
作者:Thu Trang Do、Ye Eun Ha、Byung-Hyun Ahn、Gun Dae Lee、Joo Hyun Kim
DOI:10.1080/15421406.2014.933383
日期:2014.7.24
Two newly designed donor-acceptor (D-A) conjugated polymers were prepared from the Stille coupling reactions by incorporating phthalimide derivative as a co-acceptor unit into 2,1,3-benzooxadiazole (BO) and thiophene with different ratios of 5mol.% and 10mol.% of TBO-I 5, TBO-I 10, respectively. Polymers possess moderate molecular weights and excellent thermal properties with a 5% weight loss temperatures (T-d) around 300 degrees C. Compared to poly5,6-bis(decyloxy)-4-(thiophen-2-yl)benzo[c][1,2,5]oxadiazole} (TBO), adding phthalimide unit in TBO-I 5 and TBO-I 10 shifted UV-Vis absorption spectra and changed the HOMO and LUMO levels of polymers. Bulk hetero junction (BHJ) polymer solar cells (PSCs) based on polymers blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61BM) were fabricated to investigate photovoltaic properties. As a results, with increasing the composition of phthalimide, the J(sc) of the devices based on polymers were reduced in the order of TBO (4.74mA/cm(2)) > TBO-I 5 (3.94mA/cm(2)) > TBO-I 10 (1.90mA/cm(2)) due to the blue-shifted in absorption spectra and twisting in polymer main chain of TBO-I polymers. The decrease in J(sc) led to low photovoltaic performances and the device based on TBO showed higher performances than those of TBO-I 5 and TBO-I 10 with the PCE of 1.66%, the J(sc) of 4.74mA/cm(2), the V-oc of 0.82V and the FF of 42.4% under the illumination of AM 1.5G, 100 mW/cm(2).