共查询到20条相似文献,搜索用时 46 毫秒
1.
In this paper we report for the first time on the reaction of C70 with alkyl azides and show that the [3+2]-cycloaddition occurs preferably at bond 7 followed by bond 5 to give two regioisomeric A/B-triazolines and one C/C-triazoline Thermal extrusion of N2 from these triazolines leads to open [5,6]-bridged iminofullerenes as A/A- and B/C-isomers as well as to the ring closed [6,6]-bridged analogues as A/B- and C/C-isomers. These results are in line with the corresponding thermal reaction of C70 with diazomethane. 相似文献
2.
Yury I. Lyakhovetsky Elena A. Shilova Boris L. Tumanskii Alexander V. Usatov Era A. Avetisyan Sergei R. Sterlin 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(2):263-287
Abstract Both [60]- and [70]fullerene react with either the Scherer radical (perfluorodiisopropylethylmethyl, C9F19), a mixture of branched perfluorononenes (C9F18, the product of hexafluoropropene trimerization), or β-fluorosulphatotetrafluoroethyldiheptafluoroisopropylmethyl radical (C9F18OSO2F) in the ionization chamber of a mass spectrometer to give the positive parent ions of trifluoromethylation products, the reaction being accompanied by hydrogen addition. The reaction occurs at least partly on the walls of the ionization chamber, by a radical mechanism employing CF3 radicals formed from the radical reactants both thermally and under electron impact; only the latter route occurs with the perfluorononenes. 相似文献
3.
Singaram Muthu Pichai Maruthamuthu 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(5):1061-1066
Abstract The chlorosulphonylisocyanate reacts smoothly with C60 in xylene under thermal conditions in a [2+2]-cycloaddition fashion to yield the bisadduct as one of the products in the inseparable reaction mixture. The reaction product is analysed by FAB-MS, 13C NMR, FT-IR and HPLC techniques. Results show the formation of imino-lactone as one of the favourable products. 相似文献
4.
《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(2):105-113
Abstract It is shown by HPLC diode‐array analysis that the C60 and C70 polymeric fullerene oxides ([C60]‐PFOs and [C70]‐PFOs) which are polymeric ozonides, are composed by nine different components. The ozonide derivatives of C60 and C70 have been proved to be practically analogous in chemical structure and composition. The most important component of both [C60]‐PFOs and [C70]‐PFOs accounts for about 3/4 of each sample. The overozonation of [C60]‐PFOs in methanol has been studied and shown to not produce any significant changes. 相似文献
5.
N. G. Spitsina S. V. Konovalikhin A. A. Lobach E. V. Golubev M. G. Kaplunov O. A. D'yachenko 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(6):561-576
Abstract New molecular complexes of [60]fullerene with 2-(4-thione-l,3-dithiolan-5-yliden)-4,5-dimethyl-l,3-diselenol [C60·2(DTDS)] have been synthesized, crystal structure, IR spectral and electrochemical properties have been studied. Partial charge transfer has been found. An unusual shortening of the endocyclic S-C(sp2) bond in the DTDS molecule has been found to be stipulated by conformational vibrations of the >CH2 group. A comparative analysis of the X-ray data for the [C60·2(DTDS)] crystals and the quantum chemical calculations (SCF MO, 6-31G? basis) for the DTDS molecules and its radical ions showed charge transfer not to be the cause for the shortening of the exocyclic C=S bonds. 相似文献
6.
Masanori Kawasumi Takayuki Ishida Takashi Nogami 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(3):357-367
Abstract Three-step synthesis from dialkyl ketone (R2C=O) with C60 gave C60(CR2)n [R = Me, Et, Pr, Bu, (CH2)5.; n = 1, 2]. The adducts were isolated by means of gel permeation chromatography, and the monoadducts were characterized by 1H and/or 13C NMR spectroscopies as a mixture of major [5, 6] and minor [6, 6] isomers. Their solubility and electrochemical properties were reported. 相似文献
7.
Koichi Komatsu Yasujiro Murata Guan-Wu Wang Toru Tanaka Noriyuki Kato Koichi Fujiwara 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(4):609-620
Abstract The solid-state mechanochemical reaction of fullerene C60 by the use of a high-speed vibration milling technique has been applied to the nucleophilic addition of an organozinc reagent to C60, [4+2] cycloaddition of C60 with condensed aromatic hydrocarbons, 1,3-dipolar addition of C60 with organic azides, and dimerization of C60. 相似文献
8.
S. V. Konovalikhin O. A. Dyachenko G. V. Shilov N. G. Spitsyna E. B. Yagubskii 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(3):563-575
Abstract A new molecular complex of [60]fullerene with composition 2(C60)·2(TMTSF)·(C6H6) was synthesized. The structure and composition of the complex were found by an x-ray study. Crystal data: 2(C60)2(C10H12Se4)(C6H6), M = 2415.4, monoclinic, a = 19.388(4), b = 13.410(2), c = 32.467(6) A, β = 92.71(2)°, V = 8432(3) [Adot]3, space group P21/n, Z = 4, dcalc = 1.903 g/cm3, R = 0.0606. The crystal structure was shown to be layered with the alternating layers of three types. Two of them have the same composition (C60, TMTSF) but different interorientation of molecules in a layer and different number of shortened contacts C…C and C…Se. The third layer consists of benzene molecules. The energy of intermolecular interactions C60…. TMTSF was estimated by ab initio calculations. The TMTSF molecule has a “boat” conformation. 相似文献
9.
《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(2):165-185
Abstract The effect of the reagent ratio, reaction time and power of the reagent on the product composition in chlorination of [60]fullerene was studied. Chlorofullerenes C60Cl6, C60Cl8, C60Cl10, C60Cl12, C60Cl14, and C60Cl26 were synthesized and characterized by chemical analysis, FTIR, 13C NMR, and MALDI TOF mass spectrometry. The experimental data supported the coexistence of several isomers of C60Cl n (n = 8, 10, 12, 14, 26); the mixtures were not separated so far. Semiempirical calculations (AM1, PM3) were used to analyze the addition patterns and resulted in the most favorable structures of C60Cl8–26. Chlorination of C70 under various conditions invariably yielded C70Cl10. 相似文献
10.
Chiral ionic liquids, [C2mim][LLA], [C4mim][LLA] and [C6mim][LLA] were firstly applied as both ligand and reaction media for atom transfer radical polymerization using activators generated by electron transfer (AGET ATRP) of acrylonitrile (AN) with ascorbic acid (VC) as reducing agent in the presence of air. A small but clear increase of polyacrylonitrile (PAN) isotacticity was observed for AGET ATRP of AN in [C6mim][LLA] than in [C6mim][BF4]. PAN isotacticity markedly increased with the content of [C6mim][LLA]. Compared with in [C2mim][LLA] and [C4mim][LLA], the rate of AGET ATRP of AN in [C6mim][LLA] was fastest and the polymerization was best controlled. Well-defined PAN with molecular weight at 76,590, relatively narrower distribution at 1.27 and higher isotacticity at 0.37 was successfully prepared in [C6mim][LLA]. 相似文献
11.
《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(1-2):221-227
Abstract 61‐(Dimethoxyphosphoryl)‐61‐(methoxycarbonyl)methano[60]fullerene was produced by using the joint electrochemical reduction of fullerene C60 and (dimethoxyphosphoryl)methoxycarbonyldibromomethane. A few steps of reduction were detected for phosphorylated methano[60]fullerenes. When two electrons per molecule are transferred, the methano fragment is rapidly eliminated (retro‐Bingel reaction). This process involves the step‐by‐step cleavage of two C–C bonds of exo‐carbon with the fullerene shell in combination with the stepwise transfer of other two electrons and a proton to form finally the carbanion of the methano fragment and fullerene dianion. 相似文献
12.
O. V. Boltalina A. Yu. Lukonin V. K. Pavlovich L. N. Sidorov R. Taylor A. K. Abdul-Sada 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(3):469-479
Abstract A reaction between [60]fullerene and terbium(IV) fluoride is shown to be a new example of the thermally induced disruption of the fullerene skeleton. “Hyperfluorination” occurs at the elevated temperature (350° C) thereby producing species C60 Fx (x > 60). The fluorination products were characterized by mass spectrometry and IR spectroscopy methods. 相似文献
13.
Lixin Xiao Masaki Ozawa Mituhiro Iwaya Jian Wang Hidekazu Shimotani Nita Dragoe 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(1-2):77-88
Abstract A series of regioisomeric bis-methanofullerenes (diethyl [60]fullerenobisacetate) were prepared by reaction of the sulfonium ylide with C60. Seven stable resultant regioisomers were completely isolated on a preparative HPLC and identified by FT-IR, UV-vis, TOF-MS, and 1H and 13C NMR measurements. The structures of these bisadducts were assigned based on 1) the relationship of the polarities of the regioisomers with the elution order from HPLC; 2) a comparison of their UV-vis spectra with those of corresponding Bingel-Hirsch bisadducts; and 3) the identification of their molecular symmetries by their 1H and 13C NMR spectra. The electrochemical properties of the resultant regioisomeric bismethanofullerene, derivatives were investigated through cyclic voltammetry (CV). The bisadducts exhibited more negative reduction potential than the pristine C60. Trans-2- and cis-3- bisadducts had the least negative potential E1 1/2 of all the other bisadducts. 相似文献
14.
《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(4):293-311
ABSTRACT The thermal behavior of graphite, C60 fullerene, fullerene black (carbon soot containing fullerenes), extracted fullerene black and diamond has been analyzed to 1000°C by TGA–DTA (thermogravimetric analysis and differential thermal analysis) under a nitrogen flow at a heating rate of 20°C/min. Very small weight losses have been recorded in the case of graphite and diamond. Furthermore no diamond graphitization has been observed. The sublimation of pure C60 and the fullerene fraction of fullerene black (both pristine and extracted) has been observed and discussed. The combustion reaction in air flow of graphite, C60 and C70 fullerenes, fullerene black (both unextracted and extracted), carbon nanotubes and diamond has been studied by TGA–DTA at a heating rate of 20°C/min. C70 fullerene and fullerene black have been found to be the most reactive carbon materials with O2. The role played by C70 in the degradation of fullerites has been discussed. Among the carbon materials examined, the best resistance to O2 attack has been shown by diamond and carbon nanotubes. The behavior of graphite is intermediate between diamond and fullerene blacks. The behavior of C60 fullerene appears closer to that of graphite although it appears to be more reactive with O2. Samples of graphite and carbon blacks N375 and N234 have been studied by TGA–DTA in air flow before and after a radiation treatment with neutrons or γ radiation. The effect of the radiation damage in the combustion reaction of these carbon materials has been discussed. 相似文献
15.
Jeong Won Ko Kun’ichi Miyazawa Yumi Tanaka 《Fullerenes, Nanotubes and Carbon Nanostructures》2020,28(10):794-798
AbstractComposites comprising platinum nanoparticles loaded on [C60]fullerene nanowhiskers were prepared by a liquid-liquid interfacial precipitation method. The synthesized platinum nanoparticle-[C60]fullerene nanowhisker composites were characterized by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. The catalytic activity of the platinum nanoparticle-[C60]fullerene nanowhisker composites was confirmed for the reduction of 4-nitrophenol by UV–vis spectroscopy. The reduction of 4-nitrophenol catalyzed by the platinum nanoparticle-[C60]fullerene nanowhisker composites followed the pseudo-first-order reaction rate law. 相似文献
16.
AbstractA novel cationic photoinitiator, cyclopentadiene-iron-naphthalene tetrafluoroborate ([Cp-Fe-Naph]BF4) salt, was synthesized, characterized and used for preparing photosensitive materials. The purification process and the reaction conditions were optimized. The highest yield can reach 82 per cent. Compared with the mono-arene iron complexes, [Cp-Fe-Naph]BF4 possesses a higher molar extinction coefficient (ε = 893 M?1 cm?1) at 373 nm in CH2C12 and is more efficient for the polymerization of epoxide when a high-pressure mercury lamp is used as an ultraviolet light source. The photosensitivity S can reach 78.1 mJ/cm2 when [Cp-Fe-Naph]BF4 is used to initiate the epoxide E44. When the photosensitizer benzoyl peroxide (BPO) is employed, [Cp-Fe-Naph]BF4 is rendered much more efficient as a photoinitiator. The best molar ratio of BPO to [Cp-Fe-Naph]BF4 is 1:1 to 1:2. In the photopolymerization of epoxide initiated by [Cp-Fe-Naph]BF4, the temperature is very important with respect to the polymerization rate. At 60°C, the polymerization can be completed in a short time. 相似文献
17.
《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(3):269-281
Abstract We present a new use of fullerene C60 as a template for the synthesis of cyclic resorcinarenes, The cyclocondensation of 2‐methyl‐resorcinol with benzaldehyde and hexanal in THF, catalyzed by AlCl3, in the presence of 1%, 5%, and 10% fullerene C60, produces calix[4], [5], and [6] resorcinarenes, with the pentamer and hexamer as the major products. The resorcinarenes were characterized by 1H, 13C NMR, FTIR, FAB+ mass spectrometry, and elemental analysis. 相似文献
18.
Yunlong Sui Jiuxin Qian Jing Zhang Xihuang Zhou Zhennan Gu Yi Wu 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(5):813-818
Abstract C60H18 was obtained by direct hydrogenation of C60 at 400 C and 80 atm C60 was hydrogenated to C60H36 as a main product in the presence of Pd/C catalyst at 180C and 30–70 atm. C60H36 is unstable in dichloromethane and some other organic solvents. 相似文献
19.
Xianwen Wei Zhiyong Suo Gui Yin Zheng Xu 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(5):781-793
Abstract Six new organic cations (Triphenylmethane dye, Hemicyanine dyes, calix[4]arene derivative) buckminsterfulleride salts were prepared by metathetical reaction. the products were characterized by UV-NIR, ESI-MS, ESR and FT-IR. the ESR spectra show a typical C60 anion radical signal and dependence on countercations and temperature, the linewidth has an abrupt increasing at about the THF melting point and the ESR signal diminishes gradually when the temperature below 170K. the possible explanation is that the THF crystallization results in exclusion of solute from the lattice and leads to C60 anion aggregation, which promotes line broadening and diamagnetic dimer of (C60)2 2? forming. 相似文献
20.
D. Heymann 《Fullerenes, Nanotubes and Carbon Nanostructures》2013,21(3):509-515
Abstract The solubilities of C60 and C70 at 25°C in seven normal alcohols obey the relationship InY = a + bX + cX2, where Y is solubility and X is the Hildebrand solubility parameter of the solvent. Extrapolation to the solubility parameter of water yields solubilities in water of 1.3′10?11 (C60) and 1.3′10?10(C70) ng/ml with an uncertainty of one order of magnitude. 相似文献