13979-56-1Relevant academic research and scientific papers
Catechol-Coordinated Framework Film-based Micro-Supercapacitors with AC Line Filtering Performance
Yu, Tianliang,Wang, Youfu,Jiang, Kaiyue,Zhai, Guangqun,Ke, Changchun,Zhang, Jichao,Li, Jiantong,Tranca, Diana,Kymakis, Emmanuel,Zhuang, Xiaodong
, p. 6340 - 6347 (2021)
Coordination polymer frameworks (CPFs) have broad applications due to their excellent features, including stable structure, intrinsic porosity, and others. However, preparation of thin-film CPFs for energy storage and conversion remains a challenge because of poor compatibility between conductive substrates and CPFs and crucial conditions for thin-film preparation. In this work, a CPF film was prepared by the coordination of the anisotropic four-armed ligand and CuII at the liquid–liquid interface. Such film-based micro-supercapacitors (MSCs) are fabricated through high-energy scribing and electrolytes soaking. As-fabricated MSCs displayed high volumetric specific capacitance of 121.45 F cm?3. Besides, the volumetric energy density of MSCs reached 52.6 mWh cm?3, which exceeds the electrochemical performance of most reported CPF-based MSCs. Especially, the device exhibited alternating current (AC) line filtering performance (?84.2° at 120 Hz) and a short resistance capacitance (RC) constant of 0.08 ms. This work not only provides a new CPF for MSCs with AC line filtering performance but also paves the way for thin-film CPFs preparation with versatile applications.
Crystalline Anionic Germanate Covalent Organic Framework for High CO2 Selectivity and Fast Li Ion Conduction
Ashraf, Shumaila,Zuo, Yiming,Li, Shuai,Liu, Caixia,Wang, Hang,Feng, Xiao,Li, Pengfei,Wang, Bo
, p. 13479 - 13483 (2019)
The metalloid-centered covalent organic framework has attracted great interest from both its structure and application. Heavier elements have seldomly been incorporated in the covalent organic frameworks, even if they exhibit special structural features and properties. Herein, we reported the first crystalline germanate covalent organic framework with hexacoordinated germanate linked by an anthracene linker. The existence of counterion lithium ions in the framework provides a high CO2 uptake of 88.5 cm3 g?1 at 273 K and a high CO2/N2 selectivity of 101. A significantly improved lithium ion conductivity of 0.25 mS cm?1 at room temperature was observed due to the soft germanium center.
ANTHRACENYL-TETRALACTAM MACROCYCLES AND THEIR USE IN DETECTING A TARGET SACCHARIDE
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Paragraph 0303, (2015/06/03)
A water-soluble compound of the formula (I): (Formula (I)) wherein R9 and R10 are suitably hydrophilic substituents, which may be used to selectively bind to a target saccharide such as glucose and which exhibits a detectable spectro
Structural Effects Controlling the Rate of the Retro-Diels-Alder Reaction in Anthracene Cycloadducts
Chung, Yongseog,Duerr, Brook F.,McKelvey, Timothy A.,Nanjappan, P.,Czarnik, Anthony W.
, p. 1018 - 1032 (2007/10/02)
We have undertaken a fairly broad study of how the structure of an anthracene cycloadduct affects the rate of its cycloreversion reaction.Based on the rate constants for retro-Diels-Alder (rDA) reactions of a variety of anthracene-type adducts conducted in diphenyl ether, we draw the following conclusions.The rDA reaction of anthracene cycloadducts is influenced by diene substituents in the following ways: (1) electron-donating groups increase the reaction rate, and the accelerating effect is subject to geometric modulation for a conjugating substituent like dimethylamino; (2) electron-withdrawing groups may decrease or increase the reaction rate , although the effect is rarely large; and (3) steric acceleration is relatively small and demonstrates an unprecedented bell-shaped structure-reactivity profile.Peripheral substitution of the adduct with siloxy groups results in a significant acceleration, even though the groups are three bonds removed from the reaction site.The same reaction is influenced by dienophile substituents in the following ways: (1) electron-withdrawing groups increase the rate of the reaction; (2) strongly conjugating substituents make the reaction much faster than predicted by classical electron-withdrawing or -donating ability due to a change to polar mechanism; and (3) there is no observable steric effect.
