共查询到20条相似文献,搜索用时 15 毫秒
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Christian Balischewski Dr. Karsten Behrens Dr. Kerstin Zehbe Dr. Christina Günter Stefan Mies Dr. Eric Sperlich Alexandra Kelling Prof. Dr. Andreas Taubert 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(72):17504-17513
Thirteen N-butylpyridinium salts, including three monometallic [C4Py]2[MCl4], nine bimetallic [C4Py]2[M1−xaMxbCl4] and one trimetallic compound [C4Py]2[M1−y-zaMybMzcCl4] (M=Co, Cu, Mn; x=0.25, 0.50 or 0.75 and y=z=0.33), were synthesized and their structure and thermal and electrochemical properties were studied. All compounds are ionic liquids (ILs) with melting points between 69 and 93 °C. X-ray diffraction proves that all ILs are isostructural. The conductivity at room temperature is between 10−4 and 10−8 S cm−1. Some Cu-based ILs reach conductivities of 10−2 S cm−1, which is, however, probably due to IL dec. This correlates with the optical bandgap measurements indicating the formation of large bandgap semiconductors. At elevated temperatures approaching the melting points, the conductivities reach up to 1.47×10−1 S cm−1 at 70 °C. The electrochemical stability windows of the ILs are between 2.5 and 3.0 V. 相似文献
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离子液体具有不挥发性、非易燃性、离子电导率高、物化性能稳定、电化学窗口宽、结构多样性与可设计性等诸多优良特性,近年来已在电化学、生物、绿色化学等领域发挥着至关重要的作用。本文综述了离子液体在生物方面的一些应用:作为理想的载体将目标基因或者药物运送到靶细胞中达到治疗的目的;探究离子液体的毒性对生物体的影响从而达到杀灭癌细胞等特殊细胞或绿色降解的目的;利用其电催化活性好、灵敏度高等特性制成生物传感器用于电化学检测;将离子液体作为核酸分离的载体,使得核酸的分离的过程简化、效率提高。 相似文献
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Ting He Cheng-Bin Hong Peng-Chong Jiao Heng Xiang Yan Zhang Hua-Qiang Cai Shuang-Long Wang Guo-Hong Tao 《Molecules (Basel, Switzerland)》2021,26(1)
[AAE]X composed of amino acid ester cations is a sort of typically “bio-based” protic ionic liquids (PILs). They possess potential Brønsted acidity due to the active hydrogens on their cations. The Brønsted acidity of [AAE]X PILs in green solvents (water and ethanol) at room temperature was systematically studied. Various frameworks of amino acid ester cations and four anions were investigated in this work from the viewpoint of structure–property relationship. Four different ways were used to study the acidity. Acid dissociation constants (pKa) of [AAE]X determined by the OIM (overlapping indicator method) were from 7.10 to 7.73 in water and from 8.54 to 9.05 in ethanol. The pKa values determined by the PTM (potential titration method) were from 7.12 to 7.82 in water. Their Hammett acidity function (H0) values (0.05 mol·L−1) were about 4.6 in water. In addition, the pKa values obtained by the DFT (proton-transfer reactions) were from 7.11 to 7.83 in water and from 8.54 to 9.34 in ethanol, respectively. The data revealed that the cationic structures of [AAE]X had little effect and the anions had no effect on the acidity of [AAE]X. At the same time, the OIM, PTM, Hammett method and DFT method were reliable for determining the acidic strength of [AAE]X in this study. 相似文献
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Peter Nockemann Dr. Michael Pellens Kristof Van Hecke Dr. Luc Van Meervelt Prof. Dr. Johan Wouters Prof. Dr. Ben Thijs Dr. Evert Vanecht Tatjana N. Parac‐Vogt Prof. Dr. Hasan Mehdi Stijn Schaltin Jan Fransaer Prof. Dr. Stefan Zahn Barbara Kirchner Prof. Dr. Koen Binnemans Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(6):1849-1858
A series of nitrile‐functionalized ionic liquids were found to exhibit temperature‐dependent miscibility (thermomorphism) with the lower alcohols. Their coordinating abilities toward cobalt(II) ions were investigated through the dissolution process of cobalt(II) bis(trifluoromethylsulfonyl)imide and were found to depend on the donor abilities of the nitrile group. The crystal structures of the cobalt(II) solvates [Co(C1C1CNPyr)2(Tf2N)4] and [Co(C1C2CNPyr)6][Tf2N]8, which were isolated from ionic‐liquid solutions, gave an insight into the coordination chemistry of functionalized ionic liquids. Smooth layers of cobalt metal could be obtained by electrodeposition of the cobalt‐containing ionic liquids. 相似文献
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L. E. Barrosse‐Antle A. M. Bond R. G. Compton A. M. O'Mahony E. I. Rogers D. S. Silvester 《化学:亚洲杂志》2010,5(2):202-230
The recent literature is surveyed to explore the nature of voltammetry in room temperature ionic liquids. The extent of similarities with conventional electrochemical solvents is reported and some surprising differences are noted. 相似文献
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Lars H. Finger Prof. Dr. Jörg Sundermeyer 《Chemistry (Weinheim an der Bergstrasse, Germany)》2016,22(12):4218-4230
We present the synthesis and thorough characterization of ionic liquids and organic salts based on hydrochalcogenide HE? (E=S, Se, Te) anions. Our approach is based on halide‐, metal‐, and water‐free decarboxylation of methylcarbonate precursors under acidic conditions, resulting from the easily dissociating reagents H2E. The compounds were characterized by elemental analysis, multinuclear NMR spectroscopy, thermal and single‐crystal XRD analyses. The hydrosulfide salts were investigated with respect to their ability to dissolve elemental sulfur in varying stoichiometry. Thus‐prepared polysulfide ILs were also analyzed by UV/Vis spectroscopy and cyclic voltammetry. 相似文献
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Yu‐Zhuan Su Yong‐Chun Fu Jia‐Wei Yan Dr. Zhao‐Bin Chen Bing‐Wei Mao Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(28):5148-5151
Ring any bells? The differential capacitance curve of Au(100) in neat [BMI]BF4 (BMI=1‐butyl‐3‐methylimidazolium) ionic liquid has a bell‐shaped feature (see picture). The adsorption of BMI+ shows a disorder–order transition and depends on the structure of the surface. Ordered adsorption in a micelle‐like structure stabilizes the underlying Au surface.
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Maximilian Knies Dr. Matthias F. Groh Tobias Pietsch Mai Lê Anh Prof. Dr. Michael Ruck 《ChemistryOpen》2021,10(2):110-116
Bi2S3 was dissolved in the presence of either AuCl/PtCl2 or AgCl in the ionic liquids [BMIm]Cl ⋅ xAlCl3 (BMIm=1-n-butyl-3-methylimidazolium; x=4–4.3) through annealing the mixtures at 180 or 200 °C. Upon cooling to room temperature, orange, air-sensitive crystals of [BMIm](Bi4S4)[AlCl4]5 ( 1 ) or Ag(Bi7S8)[S(AlCl3)3]2[AlCl4]2 ( 2 ) precipitated, respectively. 1 did not form in the absence of AuCl/PtCl2, suggesting an essential role of the metal cations. X-ray diffraction on single-crystals of 1 revealed a monoclinic crystal structure that contains (Bi4S4)4+ heterocubanes and [AlCl4]− tetrahedra as well as [BMIm]+ cations. The intercalation of the ionic liquid was confirmed via solid state NMR spectroscopy, revealing unusual coupling behavior. The crystal structure of 2 consists of (Bi7S8)5+ spiro-dicubanes, [S(AlCl3)3]2− tetrahedra triples, isolated [AlCl4]− tetrahedra, and heavily disordered silver(I) cations. No cation ordering took place in 2 upon slow cooling to 100 K. 相似文献
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Jocelyn J. Tindale Kurtis D. Hartlen Abdolhamid Alizadeh Prof. Mark S. Workentin Prof. Paul J. Ragogna Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2010,16(30):9068-9075
The synthesis and characterization of several compounds representing a new class of multitask‐specific phosphonium ionic liquids that contain a maleimide functionality is reported. The maleimide moiety of the ionic liquid (IL) is shown to undergo Michael‐type additions with substrates containing either a thiol or amine moiety, thus, serving as a template to introduce wide structural diversity into the IL. Multitask‐specific ILs are accessible by reaction of the maleimide with Michael donors that are capable of serving some function. As a model example to illustrate this concept, a redox active ferrocenyl thiol was incorporated and examined by cyclic voltammetry. Because the maleimide moiety is highly reactive to additions, the task‐specific ionic liquids (TSILs) are prepared as the furan‐protected Diels–Alder maleimide. The maleimide moiety can then be liberated when required by simple heating. 相似文献
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Qinghua Zhang Dr. Shimin Liu Zuopeng Li Jian Li Zhengjian Chen Ruifeng Wang Liujin Lu Youquan Deng Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(3):765-778
A new series of ionic liquids composed of three cyclic sulfonium cations and four anions has been synthesized and characterized. Their physicochemical properties, including their spectroscopic characteristics, ion cluster behavior, surface properties, phase transitions, thermal stability, density, viscosity, refractive index, tribological properties, ion conductivity, and electrochemical window have been comprehensively studied. Eight of these salts are liquids at room temperature, at which some salts based on [NO3]? and [NTf2]? ions exhibit organic plastic crystal behaviors, and all the saccharin‐based salts display relatively high refractive indices (1.442–1.594). In addition, some ionic liquids with the [NTf2]? ion exhibit peculiar spectroscopic characteristics in FTIR and UV/Vis regions, whilst those salts based on the [DCA]? ion show lower viscosities (34.2–62.6 mPa s at 20 °C) and much higher conductivities (7.6–17.6 mS cm?1 at 20 °C) than most traditional 1,3‐dialkylimidazolium salts. 相似文献
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磁性离子液体是指能够吸附在磁铁上,在外加磁场作用下具有一定磁化强度的离子液体。本文综述了自2004年磁性离子液体概念提出至今在各领域的应用,其可以催化吡咯、3-甲基噻吩等单体合成导电高分子纳米微球,同时起到溶剂和模板的作用;还可以通过外加磁场调整产物的微观结构和形貌,从而得到不同的纳米结构;它也可以充当Lewis酸催化剂,催化傅克反应等一系列化学反应,并可以回收重复使用,而且回收有望通过磁场简单实现;与碳纳米管以共价键结合可以制备具有磁性的碳纳米管。除此之外,磁性离子液体在光控顺磁性超分子体系、吸收有机挥发物等领域的应用在近年也陆续有报道。 相似文献
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《Chemphyschem》2006,7(1):58-61
In addition to their stability, the advantages of air‐ and water‐stable ionic liquids over chloroaluminate ionic liquids, which were intensively investigated in the past, are that they are easy to dry, purify, and handle. Moreover, some of these ionic liquids have an extremely large electrochemical window of more than 5 V, and hence they give access to the electrodeposition of many metals and semiconductors, such as Ta, Ti, Si, and Ge. The results to date for the electrodeposition of metals and semiconductors in the most popular air‐ and water‐stable ionic liquids are presented. 相似文献
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Felix Schroeter Johannes Soellner Dr. Thomas Strassner 《Chemistry (Weinheim an der Bergstrasse, Germany)》2019,25(10):2527-2537
We present a new class of tunable aryl alkyl ionic liquids (TAAILs) containing different palladate counter ions. Solid-state structures for representative compounds have been obtained. Their properties are presented in comparison to those of newly synthesized and reported palladate ionic liquids with conventional counter ions. It was found that the aryl substitution pattern and the type of anion have a profound influence on the melting point. The speciation of the different anions in solution has been rationalized by DFT calculations. 相似文献
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Cu(I) and Ni(II) coordination polymers with 4,4′-bipyridine and 2,2′-bipyridine, respectively, that have been synthesized from an ionic liquid (1-ethyl-3-methylimidazolium tetrafluoroborate) gave different coordination environment and supramolecular networks than the corresponding synthesis from the other solvents. The resultant complexes were characterized by single crystal x-ray diffraction methods. 相似文献