共查询到20条相似文献,搜索用时 93 毫秒
1.
Sergey I. Troyanov Alexey A. Goryunkov Daria V. Ignat’eva Stanislav M. Avdoshenko Vitalii Yu. Markov Kerstin Scheurel 《Journal of fluorine chemistry》2007,128(5):545-551
Three isomers of C60(CF3)16 and one isomer of C60(CF3)18 have been isolated by HPLC from a mixture prepared by trifluoromethylation of C60 with CF3I in a glass ampoule at 380-400 °C. The molecular structures of the four new compounds have been determined by means of X-ray single crystal diffraction and discussed in terms of mechanistic pathways of their formation and relative stability according to the DFT calculations. 相似文献
2.
6-氨基己酸及2-氨基乙磺酸C60加成物的合成及溶解性 总被引:3,自引:0,他引:3
水溶性Fullerenes (C60)衍生物的制备对于C60的生物学研究具有十分重要的意义. 氨基酸与C60的胺化反应可得到水溶性的氨基酸C60衍生物. 以C60与过量6-氨基己酸或2-氨基乙磺酸(摩尔比为1∶10)于80 ℃搅拌反应24 h, 分别得到加成度为5和4的氨基酸C60主产物, 产率按加入的C60计算分别为30%, 28%. 氨基酸碳链的长度及加成产物在反应体系中能否及时沉淀析出影响和控制着加成度的大小. C60[NH(CH2)5COOH]5H5 (3a), C60(NHCH2CH2SO3H)4H4 (6a)用柱层析进一步纯化, 其结构组成经元素分析, 1H NMR, 13C NMR, IR所证实. 6a的水溶性受溶液pH的影响较小, 3a在不同pH缓冲溶液中的溶解性用光谱法测定, 分别为: pH=10.25时为71.81 mg•mL-1, pH=7时为23.68 mg•mL-1, pH=3.36时为10.12 mg•mL-1. 在波长273 nm处, 3a的摩尔消光系数为ε=3.43×104 L•mol-1•cm-1. 相似文献
3.
C2(a 3πu) disappearance rate constants of 1.44, 0.96, 0.0296, 0.0130 and < 10?6(x10?10cm3s?1) are reported for reactions with C2H4, C2H2, O2, C2H6, and CH4, respectively at 298 K. C2(a 3πu) fragments are generated by multiphoton ArF excimer laser photodissociation at C2H2, and monitored by dye laser induced fluorescence. Arguments are presented which favor chemical reactions over the C2(a 3πu) → (X 1σ+g) quenching channel. C2 + C2H2 represents the one possible exception to the reactive channel. 相似文献
4.
5.
V.V. Bashilov 《Tetrahedron》2008,64(49):11291-11295
Single-crystal X-ray study of 6,9,12,15,18-pentamethyl-1,6,9,12,15,18-hexahydro(C60-Ih)[5,6]fullerene (C60Me5H) has been reported. In crystal packing, the stacking self-organization of molecules is realized. It is concluded that the formation of such polar columns is a general rule for crystals of C60R5H independent of the nature of the R group. An ESR spectrum of the stable fullerenyl radical of the cyclopentadienyl-type, C60Me5, was observed in a sample of the pentamethylated[60]fullerene. Rotation of methyl groups around C-C bonds is restricted on the ESR scale time and therefore protons within each methyl group are non-equivalent. 相似文献
6.
Toshihiko Osaki Toshiyuki Tanaka Yutaka Tai 《Reaction Kinetics and Catalysis Letters》2003,79(2):319-324
Temperature-programmed reaction (TPR) of C60 and C70 with H2 was carried out on nickel in order to investigate the thermal stability of the fullerenes in the catalytic hydrogenation.
The TPR profiles showed two methanation peaks and the corresponding weight decrease above 420°C, indicating the hydrogenolysis
to CH4.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
7.
Debendra K. Mohapatra Gokarneswar Sahoo Dhondi K. Ramesh J. Srinivasa Rao G. Narahari Sastry 《Tetrahedron letters》2009,50(40):5636-5639
The total syntheses of decarestrictines C1 and C2 have been described. The synthetic strategy involves a practical and flexible approach using esterification and ring-closing metathesis to unite the acid and alcohol fragments. The acid fragments are enantiomers of each other and have been prepared from l-(−)-malic acid via similar transformations; in Sharpless asymmetric epoxidation, (+)-DET has been used for decarestrictine C1 and (−)-DET for decarestrictine C2. The alcohol fragment is identical for both decarestrictines C1 and C2 and has been accessed from d-(+)-mannitol. Comparison of the 1H and 13C NMR data combined with the computational studies predicts the presence of two conformations without and with hydrogen bonding (conformational isomers I and II for decarestrictine C1), respectively. The 1H and 13C NMR data for decarestrictine C2 completely agreed with the analytical data reported by Kibayashi et al. 相似文献
8.
Sergey A. Belov Dmitrii P. Krut’ko Dmitrii A. Lemenovskii Judith A.K. Howard 《Journal of organometallic chemistry》2008,693(10):1912-1918
Novel half-sandwich [C9H5(SiMe3)2]ZrCl3 (3) and sandwich [C9H5(SiMe3)2](C5Me4R)ZrCl2 (R = CH3 (1), CH2CH2NMe2 (2)) complexes were prepared and characterized. The reduction of 2 by Mg in THF lead to (η5-C9H5(SiMe3)2)[η5:η2(C,N)-C5Me4CH2CH2N(Me)CH2]ZrH (7). The structure of 7 was proved by NMR spectroscopy data. Hydrolysis of 2 resulted in the binuclear complex ([C5Me4CH2CH2NMe2]ZrCl2)2O (6). The crystal structures of 1 and 6 were established by X-ray diffraction analysis. 相似文献
9.
V.A. Bhirud P.W. Kletnieks J.F. Haw M.M. Olmstead 《Journal of organometallic chemistry》2007,692(10):2107-2113
We report a new synthesis and characterization of Ir(C2H4)2(C5H7O2) [(acetylacetonato)-bis(η2-ethene)iridium(I)], prepared from (NH4)3IrCl6 · H2O in a yield of about 45%. The compound has been characterized by X-ray diffraction crystallography, infrared, Raman, and NMR spectroscopies and calculations at the level of density functional theory. Ir(C2H4)2(C5H7O2) is isostructural with Rh(C2H4)2(C5H7O2), but there is a substantial difference in the ethylene binding energies, with Ir-ethylene having a stronger interaction than Rh-ethylene; two ethylenes are bound to Ir with a binding energy of 94 kcal/mol and to Rh with a binding energy of 70 kcal/mol. 相似文献
10.
(C6F5)2Te reacts with elemental fluorine step by step to form the tellurium fluorides (C6F5)2TeF2, (C6F5)2TeF4 and (C6F11)2TeF4, which can be isolated in pure states. The intermediates (C6F11?2n)2TeF4 (n = 1,2) are detected spectroscopically. (C6F5)2TeF2 is also formed from the reaction of (C6F5)2Te with XeF2. The preparations, properties and 19F n.m.r. spectra of these new compounds are discussed, the mass and vibrational spectra are described. 相似文献
11.
12.
A new method for the preparation of bis(perfluoroorgano) zinc compounds is described: CF3I and C6F5I react with dialkylzinc in the presence of a Lewis base quantitatively to give (CF3)2Zn and (C6F5)2Zn complexes, while the analogous reactions with C2F5I and iC3F7I do not yield the pure compounds. 1H, 19F n.m.r, i.r. and Raman spectra are presented. 相似文献
13.
The core-shell structural (BaTiO(C2O4)2/NH2CONH2) samples of giant electrorheological (ER) activity have been synthesized by a sol-gel method and studied by TEM, X-ray diffraction and IR spectroscopy. From the analysis of the X-ray diffraction, it is found that the component of samples is (BaTiO(C2O4)2/NH2CONH2) with a different content of urea. The observations of the TEM morphology show that (BaTiO(C2O4)2/NH2CONH2) particles are spheral with a size of around 80 nm and a surface coating with 5-10 nm thickness consisting of urea. The samples show an increasing tend of ER effect as the addition of urea increasing. Moreover, by IR spectroscopy study, it is revealed that some peaks of CO band and C-O band vibrations of BaTiO(C2O4)2 are split into two peaks after urea added. The extent of the splits increase with the increase of urea content, which is resulted by the interaction between the chemical bonds of urea and oxalate of BaTiO(C2O4)2. It is evident that the giant ER activity of the sample has a close relationship with the interfacial polarization between the core and the shell of (BaTiO(C2O4)2/NH2CONH2). 相似文献
14.
The [(C6H6)RuCl(1,10-C12H8N2)]Cl complex has been prepared and studied by IR, UV-Vis, 1H NMR spectroscopy and X-ray crystallography. The complex was prepared in reaction of [(C6H6)RuCl2]2 with 1,10-phenatroline in acetone. The electronic spectrum of the compound has been calculated using the TDDFT method. 相似文献
15.
The reaction of [60]fullerene with primary aliphatic alcohols (ROH, R = Et, Me, Pr) mediated by cerium(IV) ammonium nitrate [(NH4)2Ce(NO3)3] affords the corresponding alkoxy-derivatives with a hydroxy group, C60(OR)x(OH) (x = 3, 4) in high yield. The reaction is characterized by a free radical mechanism confirmed by an EPR study of the alkoxy fullerenyl radical (g = 2.0023). 相似文献
16.
A novel C60 dimer connected by a germanium bridge and a single bond was synthesized by the mechanochemical solid-state reaction using a high-speed vibration milling technique. The structural characterization was made by the 1H and 13C NMR, APCI mass, and UV-vis spectroscopy, and the presence of the electronic interaction between the two C60 cages was demonstrated by the electrochemical method. 相似文献
17.
H. Werner H. Otto Tri Ngo-Khac Ch. Burschka 《Journal of organometallic chemistry》1984,262(1):123-136
The complexes C5H5CuPR3 (R = Me, Pri), C5H5AuPR3 (R = Me, Pri), C5Me5CuPR3 (R = Me, Pri, Ph) and C5Me5AuPR3 (R = Pri, Ph) are prepared from [ClCuPR3]n or ClAuPR3 and LiC5H5 (TlC5H5) or LiC5Me5, respectively. According to the 1H and 13C NMR spectra, the cyclopentadienyl and pentamethylcyclopentadienylgold compounds are fluxional in solution. The X-ray crystal structure of C5H5AuPPr3i has been determined at ?120°C. The gold atom is in a linear arrangement (PAuC(1) = 177.0(2)°) and primarily σ-bonded to the cyclopentadienyl ring which shows a weak “slip distortion” toward a η3-mode of coordination. The complexes C5R′5AuPR3 (R′ = H, Me) and C5Me5CuPPr3i react with 1-alkynes such as C2H2, HC2Ph and HC2CO2Me to form alkinylgold and copper compounds R″C2MPR3. They have been characterized by IR, UV and NMR (1H, 13C, 31P) spectroscopy. 相似文献
18.
D. V. Pushkin E. V. Peresypkina L. B. Serezhkina A. V. Savchenkov A. V. Virovets V. N. Serezhkin 《Russian Journal of Inorganic Chemistry》2012,57(2):175-180
Single crystals of (CN3H6)2[(UO2)2(C2O4)(SeO3)2] were synthesized and studied by IR spectroscopy and X-ray diffraction. The compound crystallizes in the triclinic system
with the unit cell parameters a = 7.1169(12) ?, b = 7.4874(10) ?, c = 8.9748(14) ?, α = 88.243(6)°, β = 74.546(6)°, γ = 81.445(6)°, space group P[`1]P\bar 1, Z = 1, R = 0.0304. The main structural units of the crystals are layers of the [(UO2)2(C2O4)(SeO3)2]2− composition; the layers belong to the crystal chemical group A
2
K
02
T
23 (A = UO22+
K
02 = C2O42−, T
3 = SeO3–) of uranyl complexes. Uranium-containing complex groups are linked by electrostatic interactions and a network of hydrogen
bonds with CN3H6+ guanidinium ions to form a three-dimensional framework. 相似文献
19.
The adsorption of C2H4 on W(100) has been studied by ultraviolet photoelectron spectroscopy with hν = 21.22 eV. The spectrum measured after in initial saturation exposure at 80 K exhibits structure which correlates well with energy levels recently calculated by Demuth and Eastman (DE) for sp3 rehybridized C2H4. Dehydrogenation of the adsorbate, either by subsequent heating to 295 K or direct adsorption at 295 K, yields a spectrum which correlates with DE's calculation for sp2 rehybridized C2H2. These results suggest that C2H4 and C2H2 may be distorted from their planar and linear structures respectively and that the CC bonds on these molecules are stretched by adsorption on W(100). Qualitative arguments suggest that the bonding site for both melecules is directly over a W atom and that the Dewar—Chatt model for πd bonding in organometallic compounds is applicable. 相似文献