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Synthesis and Crystal Structure of Mercury(II) Metal Crown Ether with N‐Heterocyclic Carbene Linkage
The mercury(II) metal crown ether ( 2a ) was obtained in high yield by reaction of the carbene precursor 1,2‐bis[N‐(1‐naphthylmethylene)imidazoliumethoxy]benzene dihexafluorophosphate ( 1 ) and Hg(OAc)2. Addition of NaI to the acetone solution of 2a resulted in precipitation of pale yellow solid 2b . The structures of 2a and 2b were determined by single‐crystal X‐ray diffractometry. Both molecules display a helical conformation with a torsional cycle. The mercury atom in complex 2a is tricoordinated by two intramolecular carbene carbon atoms and an acetate oxygen atom. The mercury atom in complex 2b is tetracoordinated by two intramolecular carbene carbon atoms and two cis‐iodine atoms. 相似文献
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Chunhua Luo Zhitao Shen Xiangjian Meng Li Han Shuo Sun Tie Lin Jinglan Sun Hui Peng Junhao Chu 《先进技术聚合物》2014,25(8):809-815
Three of conjugated polymers based on pyromellitic diimide (PMDI) as the acceptor unit and thienothiophene (TT) as the donor unit were successfully synthesized by Stille coupling. The effect of the side chain length and thiophene π‐bridge on the polymers' optical and electrochemical properties was investigated. Electrochemical characterization indicated that these polymers have deep highest occupied molecular orbital energy levels between ?5.7 and ?5.8 eV. Polymer solar cells were fabricated by using these PMDI‐based polymers as the donor and [6,6]‐phenyl‐C61‐butyric acid methyl ester as the acceptor. The polymer P1 whose PMDI unit was functionalized with 2‐ethylhexyl side chain shows the higher short‐circuit current (Jsc) and fill factor (FF) compared with that of P2 with a 2‐octyldodecyl side chain on the PMDI unit. The results also illustrate that the insertion of a thiophene π‐bridge between PMDI and TT (the polymer P3) leads to the broader absorption and better photovoltaic performance. The best performance was obtained from the cell based on the polymer P3 with a power conversion efficiency of 0.43% under the illumination of AM 1.5 G, 100 mW/cm2. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
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Xiangjian Xu 《Applied mathematics and computation》2010,217(5):1944-1948
In this paper, we present a fast algorithm for solving Symmetric penta-diagonal systems. We give the feasibility and Stability analysis of the algorithm. Moreover, parallel computations can be implemented in the algorithm. The numerical examples verify the efficiency of the algorithm. 相似文献
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Anhydrous NaBiO3 polycrystal powders have been prepared through a new process in which the alkoxides were used as precursors and the parent ROH as medium. The influences of precursors and medium for products were investigated. The reducibility of Bi(Ⅲ) in solvthermal process and the morphology of NaBiO3 powders were studied. 相似文献
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Wang Ni Miaomiao Li Xiangjian Wan Yi Zuo Bin Kan Huanran Feng Qian Zhang Yongsheng Chen 《中国科学:化学(英文版)》2015,(2):339-346
A new solution-processable small-molecule donor material,named DRBDT3,comprised of oligobenzo[1,2-b:4,5-b’]dithiophene as the backbone and 3-ethyl-rhodanine as the end-capped group has been designed and synthesized for application in organic photovoltaic cells.The oligobenzodithiophene derivative exhibits an absorption band from 300 to 640 nm.The film of DRBDT3 shows highly long-range ordering assembly and high mobility of 1.21×10 4 cm2 V 1 s 1.The new molecule shows a deep highest-occupied molecular orbital energy level.The device based on DRBDT3 as the donor and PC71BM as the acceptor exhibits a power conversion efficiency of 4.09%with a high open-circuit voltage of 0.99 V under AM.1.5G illumination(100m W cm2). 相似文献