共查询到20条相似文献,搜索用时 803 毫秒
1.
电极/离子液体界面电容 总被引:1,自引:0,他引:1
用电化学阻抗方法研究了铂片电极在BMIMPF6,BMIMBF4,BMIMClO4,BMIMTf2N,BMIMCl,BMIMBr,C3OHMIMBF4,C3OHMIMClO4和BMMIMPF6(BMIM:1-butyl-3-methylimidazolium;C3OHMIM:1-(3-hydroxypropyl)-3-methylimidazolium;BMMIM:1-butyl-2-methyl-3-methylimidazolium;Tf2N:bis(trifluoromethylsulfonyl)amide)等离子液体中的界面电容及结构.结果表明:当阴、阳离子半径相差不大且不存在特性吸附时,在零电荷电势附近,电极/离子液体界面的电容-电势曲线将出现电容单峰或者双峰.电极的零电荷电势对应于单峰的峰电势或者双峰之间的谷电势.当电极电势远离零电荷电势时,电极/离子液体界面成紧密层结构,可由紧密层理论来描述.如果存在离子的特性吸附,相应的电容峰可能不再出现,而表现为双层电容随电极电势对零电荷电势的偏离而单调增加.还研究了添加小的Li+离子对电极/离子液体界面电容的影响.通过向BMIMTf2N中加入LiTf2N,发现Li+离子可以改变电极/离子液体界面的双层结构,但无助于界面电容的提高,甚至可能引起电容的降低.最后探讨了不同条件下,尤其考虑阴阳离子特性吸附时,电极/离子液体的界面结构. 相似文献
2.
G. N. Nugumanova T. A. Barsukova S. V. Bukharov D. B. Krivolapov I. A. Litvinov V. V. Syakaev N. A. Mukmeneva A. R. Burilov 《Russian Journal of General Chemistry》2010,80(7):1341-1344
3-[2-(3,5-Di-tert-butyl-4-hydroxyphenylsulfanyl)acetoxy]2,2-bis[2-(3,5-di-tert-butyl-4-hydroxyphenylsulfanyl) acetoxymethyl]propyl 3,5-di-tert-butyl-4-hydroxyphenylsulfanylacetate was synthesized. Its structure was determined by means of 1H and 13C NMR spectroscopy and X-ray-diffraction analysis. This compound was found to possess high antioxidant activity in the conditions
of auto-oxidation of low-pressure polyethylene. 相似文献
3.
选取四种不同种类离子液体(ILs),1-丁基-3-甲基咪唑溴化物([Bmim]Br)、1-丁基-3-甲基咪唑四氟硼酸盐([Bmim]BF_4)、1-丁基-3-甲基咪唑硫酸氢盐([Bmim]HSO_4)、1-丁基-3-甲基咪唑磷酸二氢盐([Bmim]H_2PO_4)与30%H_2O_2溶液在温和条件下对两种高硫脱灰煤样(LS、QX)进行脱硫实验研究。用化学法测定脱硫前后煤样形态硫含量,并利用傅里叶变换红外光谱(FT-IR)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)及热重(TG)对脱硫前后的煤样进行表征。结果表明,离子液体的加入使H_2O_2氧化脱硫能力增强,煤中硫铁矿硫和有机硫化物硫被显著脱除;经ILs/H_2O_2体系作用后的煤样中小粒径的颗粒减少,颗粒间的缝隙增大,煤表面的凹坑明显,热重实验结果表明,ILs/H_2O_2体系作用后的煤样相对于原煤热失重增大,部分挥发性物质释放峰温提前。 相似文献
4.
Actis P Caulliez G Shul G Opallo M Mermoux M Marcus B Boukherroub R Szunerits S 《Langmuir : the ACS journal of surfaces and colloids》2008,24(12):6327-6333
The paper reports on the chemical functionalization of glassy carbon electrodes with 4-bromobenzene (4-BBDT) and 4-(4'-nitrophenylazo)benzene diazonium tetrafluoroborate (4-NAB) salts in ionic liquids. The reaction was carried out at room temperature in air without any external electrical bias in either hydrophobic (1-butyl-3-methylimidazolium hexafluorophosphate) or hydrophilic (1-butyl-3-methylimidazolium methyl sulfate) ionic liquids. The resulting surfaces were characterized using X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and electrochemical measurements. Electrochemical reduction of the terminal nitro groups allowed the determination of surface coverage and formation of an amine-terminated carbon surfaces. The results were compared to glassy carbon chemically modified in an aqueous solution in the presence of 1% sodium dodecyl sulfate (SDS) with the same diazonium salt. Furthermore, Raman spectroscopy coupled with electrochemical measurements allowed to distinguish between the reduction of -NO2 to -NH2 group and the -N=N- to -NH-NH- bond. 相似文献
5.
With the purpose of assessing the reactivity of chloride ions dissolved in ionic liquids (ILs), a relative scale for the solvation of chloride is given for a series of ILs based on the bis(trifluoromethane)sulfonimide ([Tf(2)N]) anion and different cations, 1-butyl-3-methylimidazolium ([bmim]), 1-butyl-2,3-dimethylimidazolium ([bdmim]), 1-butyl-1-methylpyrrolidinium ([bmpy]), 1-butylpyridinium ([bpy]), 1-pentyl-1,1,1-triethylammonium ([C(5)e(3)am]), and 1-(2-hydroxy)ethyl-3-methylimidazolium ([mimeOH]). Insights into the solvation of chloride are achieved by the thermodynamic study of the reaction of dissociation of a chloride-templated nickel(II) metallacage performed at various temperatures by UV-visible spectroscopy in each IL. The order of chloride solvation [C(5)e(3)am][Tf(2)N] < [bmpy][Tf(2)N] < [bmim][Tf(2)N] 相似文献
6.
Chang HC Jiang JC Chang CY Su JC Hung CH Liou YC Lin SH 《The journal of physical chemistry. B》2008,112(14):4351-4356
High-pressure infrared spectroscopy was applied to study the hydrogen-bonding structures of 1-butyl-3-methylimidazolium halides/D2O mixtures. No drastic changes were observed in the concentration dependence of the alkyl C-H band frequency at high concentration of 1-butyl-3-methylimidazolium chloride. Nevertheless, the alkyl C-H exhibits an increase in frequency upon dilution at low concentration. These observations may indicate a clustering of the alkyl groups at high concentration and the formation of a certain water structure around alkyl C-H groups in the water-rich region. The imidazolium C-H band at ca. 3051 cm(-1) displays a monotonic blue-shift in frequency as the sample was diluted at high concentration of 1-butyl-3-methylimidazolium chloride. That is, water can be added to change the structural organization of 1-butyl-3-methylimidazolium chloride in the ionic liquid-rich composition region by introducing water-imidazolium C-H interactions. Analyzing the pressure dependence of the imidazolium C-H stretches yielded anomalous nonmonotonic pressure-induced frequency shifts. This result may reflect the strengthening of C-H-O interactions between imidazolium C-H groups and the water clusters. Density functional theory calculations also revealed that the characteristic bonded C2-H vibration may be shifted via the modification of C2-H-Cl- associations. 相似文献
7.
G. S. Borodkin A. A. Kolodina E. A. Gusakov I. G. Borodkina P. B. Chepurnoi S. B. Zaichenko Yu. A. Sayapin V. I. Minkin 《Russian Journal of Organic Chemistry》2016,52(7):1007-1011
The reaction of 2-methylquinoline with 3,5-di-tert-butyl-1,2-benzoquinone afforded a mixture of 5,7-di-tert-butyl-3-hydroxy-2-(quinolin-2-yl)cyclohepta-2,4,6-trien-1-one and previously unknown 10-tert-butylindolo[1,2-a]quinoline-8,11-dione. The structure of the latter was determined by two-dimensional heteronuclear correlation NMR spectroscopy. 相似文献
8.
以N-丁基-吲哚-3-甲醛和2-乙酰吡啶作为原料,通过羟醛缩合反应设计合成一种查尔酮衍生物(E)-3-(1-丁基-1氢-吲哚基)-1-(2-吡啶基)丙烯基酮(L)。 通过核磁共振波谱仪、质谱和傅里叶变换红外光谱技术手段表征了目标分子的结构。 结果表明,探针L对Cu2+表现出专一的选择性和高的灵敏度,溶液颜色由淡黄色变为红色,能够直接通过肉眼识别,检测限低至27.8 nmol/L,探针L与Cu2+的配位比为1∶1,结合核磁滴定和理论计算研究了探针L对Cu2+的识别机制。 相似文献
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10.
N. M. Storozhok N. P. Medyanik A. P. Krysin S. A. Krekov V. E. Borisenko 《Russian Journal of Organic Chemistry》2013,49(7):1031-1034
Sterically hindered phenols, 3-tert-butyl-N-(3,5-di-tert-butyl-4-hydroxyphenyl)-5-ethyl-2-hydroxybenzamide and N-[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propyl]-2-hydroxybenzamide, were synthesized as potential antioxidants, and the formation of hydrogen bonds by their molecules was shown by UV and IR spectroscopy. 相似文献
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12.
ZHANG Meng TU Xianneng WANG Jingyang FANG Tuo WANG Yanli XU Xiaodong ZHANG Milin CHEN Yitung 《高等学校化学研究》2016,32(4):530-533
In this paper, CuO, CuO/Cu2O, Cu2O, Cu2O/Cu and Cu microcrystals were synthesized via a hydrothermal method by mixing Cu(NO3)2·3H2O and NaOH together in the presence of an ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate([BMIM]BF4) or 1-butyl-3-methylimidazolium chloride([BMIM]Cl). The structures and the morphologies of the obtained products were characterized by means of X-ray diffractometer(XRD), field-emission scanning electron microscopy/energy-dispersive spectroscopy(FESEM/EDS), transmission electron microscopy/selected area electron diffraction(TEM/SAED) and Raman spectroscopy. The result of XRD indicates that Cu2O and Cu microcrystals are cubic phase and the Raman spectra confirm the presence of carbon. The results of FESEM and TEM images show Cu2O microcrystals as rule cubes of 2 μm in length and Cu particles of 5 μm in diameter. According to the difference between crystal structures, bi-component and single component products were synthesized by adjusting the reaction conditions. A possible formation mechanism of Cu2O and Cu was proposed in[BMIM]BF4. 相似文献
13.
D. A. Kashirskii E. S. Sashina T. V. Artamonova L. V. Myznikov 《Russian Journal of General Chemistry》2018,88(5):935-942
Hydrogen bonds formed upon dissolution of cellulose and cellobiose in ionic liquids, 1-butyl-3- methylpyridinium and 1-butyl-3-methylimidazolium chlorides, have been analyzed and characterized by means of Fourier-transform infrared spectroscopy and quantum-chemical calculation. The obtained data have been used for assignment of absorption bands of individual OH groups and determination of hydrogen bonds energy in the solutions. 相似文献
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15.
L. M. Ramenskaya E. P. Grishina O. V. Kraeva 《Russian Journal of General Chemistry》2012,82(4):749-755
Methods of gravimetry, optical microscopy, FTIR spectroscopy, and conductometry were applied to the study of the adsorption of the following ionic liquids: 1-butyl-3-methylimidazolium chloride, bistrifluoromethylsulfonylimide, and trifluoroacetate on thin-layer films of polymers of different nature including polypropylene, polyethylene terephthalate, polytetrafluoroethylene, poly(vinyl chloride), and hydrated cellulose. It was established that the hydrated cellulose film can serve as polymer matrices for the ionconducting 1-butyl-3-methylimidazolium halide salts. The hydrated cellulose additive in the ionic liquids promotes their immobilization on the poly(vinyl chloride) film. 相似文献
16.
LI Lin YANG JiaXiang WANG CaiXia HU ZhangJun TIAN YuPeng LI Jing WANG ChuanKui LI Ming CHENG GuangHua TANG HuoHong HUANG WenHao TAO XuTang & JIANG MinHua Department of Chemistry Anhui University Hefei China State Key Laboratory of Crystal Materials Institute of Crystal Materials of Sh ong University Jinan Department of Physics Sh ong Normal University Jinan State Key Laboratory of Transient Optics Photonics Xi’an Institute... 《中国科学:化学》2010,(4)
Two novel quadrupolar organic compounds, 3-(4-((E)-2-(9-butyl-9H-carbazol-6-yl) vinyl)styryl)-9-propyl-9H-carbazole (BCSPC) and 3-(3-(3-((1E)-2-(4-((E)-2-(3-(3,5-bis(9-butyl-9H-carbazol-6-yl)phenyl)-9-butyl-9H-carbazol-6-yl)vinyl)phenyl) vinyl)-9-butyl-9H-carbazol-6-yl)-5-(9-butyl-9H-carbazol-6-yl)phenyl)-9-butyl-9H-carbazole (BCPBC), with different conjugated arms, have been designed and synthesized. Their one-and two-photon absorption (TPA) and excited fluorescence properties have been experimentally inve... 相似文献
17.
Siutkina A. I. Sharavyeva Yu. O. Chashchina S. V. Shipilovskikh S. A. Igidov N. M. 《Russian Chemical Bulletin》2022,71(3):496-501
New N′-substituted 2-(2-(diarylmethylene)hydrazinyl)-5,5-dimethyl-4-oxohex-2-enehydrazides were synthesized by the ring opening reaction of 3-diarylmethylenehydrazono-5-tert-butyl-3H-furan-2-ones under the action of aliphatic, aromatic, and heterocyclic acid hydrazides. The structures of the obtained compounds were confirmed by 1H and 13C NMR spectroscopy, IR spectroscopy, and elemental analysis. Their anti-inflammatory activity was studied.
相似文献18.
Alan R. Katritzky Stanislaw Rachwal Terrance P. Smith 《Journal of heterocyclic chemistry》1995,32(3):1007-1010
The reaction of a tautomeric mixture of 1-butyl-1,2-dihydro-6-hydroxy-4-methyl-2-oxopyridine-3-carbonitrile and its 2-hydroxy-6-oxo analog with phosphorus oxychloride gave 1-butyl-6-chloro-1,2-dihydro-4-methyl-2-oxopyridine-3-carbonitrile (68%) and 1-butyl-2-chloro-1,6-dihydro-4-methyl-6-pyridine-3-car-bonitrile (3%). Both chloropyridones were converted to their corresponding aminopyridones by reaction with liquid ammonia. Strong support for the molecular structure of 6-amino-1-butyl-1,2-dihydro-4-methyl-2-oxopyridine-3-carbonitrile was obtained on the basis of nmr techniques. 相似文献
19.
G. V. Gavrilova D. P. Krut'ko A. A. Gavrilov K. P. Butin 《Russian Chemical Bulletin》1997,46(9):1565-1568
The reaction of 2,6-di-tert-butyl-4-dichloromethyl-4-methylcyclohexa-2,5-dien-1-one with (Me3Si)2NNa yielded 2,4-di-tert-butyl-1-chloro-6-methyltricyclo[4.1.0.02,7]hept-4-en-3-one (substituted tropovalene). The structure of the title compound was established by1H and13C NMR spectroscopy and X-ray diffraction analysis.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 9, pp. 1642–1645, September, 1997. 相似文献
20.
Gaillard C Klimchuk O Ouadi A Billard I Hennig C 《Dalton transactions (Cambridge, England : 2003)》2012,41(18):5476-5479
The complexation between uranium(vi) and nitrate ions in a hydrophobic ionic liquid (IL), namely [BMI][NO(3)] (BMI = 1-butyl-3-methylimidazolium(+)), is investigated by EXAFS spectroscopy. It was performed by dissolution of uranyl nitrate UO(2)(NO(3))(2)·6H(2)O or UO(2)(Tf(2)N)(2) (Tf(2)N = bis(trifluoromethylsulfonyl)imide (CF(3)SO(2))(2)N(-)). The formation of the complex UO(2)(NO(3))(4)(2-) is evidenced. 相似文献