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1.
Organic functionalization of carbon nanotubes 总被引:11,自引:0,他引:11
Georgakilas V Kordatos K Prato M Guldi DM Holzinger M Hirsch A 《Journal of the American Chemical Society》2002,124(5):760-761
A very general and versatile method for functionalizing different types of carbon nanotubes is described, using the 1,3-dipolar cycloaddition of azomethine ylides. Approximately one organic group per 100 carbon atoms of the nanotube is introduced, to yield remakably soluble bundles of nanotubes, as seen in transmission electron micrographs. The solubilization of the nanotubes generates a novel, interesting class of materials, which combines the properties of the nanotubes and the organic moiety, thus offering new opportunities for applications in materials science, including the preparation of nanocomposites. 相似文献
2.
K Kordatos T Da Ros S Bosi E Vázquez M Bergamin C Cusan F Pellarini V Tomberli B Baiti D Pantarotto V Georgakilas G Spalluto M Prato 《The Journal of organic chemistry》2001,66(14):4915-4920
We report the synthesis of three novel, versatile fullerene intermediates whose main feature is the presence of an amino end group. Simple condensation reactions of these intermediates under standard conditions produce new derivatives that are useful for applications in materials science and medicinal chemistry. 相似文献
3.
Kordatos Konstantinos Prato Maurizio Menna Enzo Scorrano Gianfranco Maggini Michele 《Journal of Sol-Gel Science and Technology》2001,22(3):237-244
We report on the synthesis of fullerene derivatives containing a trialkoxysilane moiety that exhibit enhanced solubility in solvents commonly used for sol-gel processing. These derivatives have been successfully embedded in glassy bulk samples and thin films that show very promising optical limiting properties. 相似文献
4.
Gournis D Georgakilas V Karakassides MA Bakas T Kordatos K Prato M Fanti M Zerbetto F 《Journal of the American Chemical Society》2004,126(27):8561-8568
Three fulleropyrrolidine derivatives, characterized by the presence of positive charges, were introduced in the interlayer space of montmorillonite. The composites were characterized by powder X-ray diffraction and differential thermal and thermogravimetric (DTA-TGA) analysis, in conjunction with FTIR, UV-Vis, Raman, and (57)Fe-M?ssbauer spectroscopies. Organophilic derivatives were intercalated into organically modified clays, while water-soluble fulleropyrrolidines were introduced into the clay galleries through ion exchange. The experiments, complemented by computer simulations, show that not all the clay-clay platelets are intercalated by the fullerene derivatives and that a sizable amount of charge transfer takes place between the host and the guests. 相似文献
5.
Eleni Chountoulesi Christine Mitzithra Konstantinos Kordatos Constantina Kollia Zaphirios Loizos 《合成通讯》2013,43(15):2042-2049
Refined mixed fullerenes were used as a reagent in known organic reactions instead of the pure fullerene C60 with aim to find an alternative, low-cost method for the synthesis of fullerene derivatives potentially exhibiting photoconductive properties. The isolation of C60 or C70 in clean form without admixtures requires the use of large quantities of toluene or other nonpolar solvents, polluting the environment and multiplying the production cost. 1,3-Dipolar cycloaddition of azomethine ylide to fullerite was chosen because this reaction is one of the most widely used for fullerene functionalization, producing material possibly presenting photoinducing behavior. The data showed that the use of the cheaper mixed fullerenes instead of pure C60 leads to the isolation of the same expected products with similar yields. The photoelectric properties of mixed fullerenes and their organic derivatives were also examined. A slightly semiconductive behavior was confirmed as well as a noticeable photoresponse. Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communications® to view the free supplemental file. 相似文献
6.
Konstantinos Kordatos Tatiana Da Ros Maurizio Prato Chuping Luo Dirk Guldi 《Monatshefte für Chemie / Chemical Monthly》2001,6(5):63-69
Fullerene derivatives exhibit absorption throughout the UV/Vis region up to 750 nm. This feature is important for easy excitation. Once excited, fullerenes may become both electron and energy acceptors. The distinction between these two pathways depends strongly on the partner involved (donor) and on the conditions employed (solvent, etc.). 相似文献
7.
Kordatos K Bosi S Da Ros T Zambon A Lucchini V Prato M 《The Journal of organic chemistry》2001,66(8):2802-2808
We report the isolation and characterization of bisadducts of fulleropyrrolidine derivatives. The compounds were characterized by means of a variety of spectroscopic techniques, including ES-MS, UV-vis, (1)H NMR, and (13)C NMR. The whole series of bisadducts was separated for the first time in the case of the bispyrrolidines, and the determination of their structure was obtained by NMR spectroscopy with the help of HMQC and HMBC techniques. 相似文献
8.
Conoci S Guldi DM Nardis S Paolesse R Kordatos K Prato M Ricciardi G Vicente MG Zilbermann I Valli L 《Chemistry (Weinheim an der Bergstrasse, Germany)》2004,10(24):6523-6530
Thin films consisting of a fulleropyrrolidine derivative 1 and a novel water-soluble porphyrin 2 were prepared by the Langmuir-Sh?fer (LS, horizontal lifting) method. In particular, a solution of 1 in chloroform and dimethyl sulfoxide was spread on the water surface, while porphyrin 2 (bearing peripheral anionic groups) was dissolved into the aqueous subphase. To the best of our knowledge, such a versatile method of film fabrication for fullerene/porphyrin mixed composite films has never been used before. Evidence of the effective interactions between the two moieties at the air-water interface was obtained from the analysis of the floating layers by means of surface pressure versus area per molecule Langmuir curves, Brewster angle microscopy and UV-visible reflection spectroscopy. The characterisation of the LS films by UV-visible spectroscopy reveals that the two constituents behave as discrete and weakly interacting pi systems. The use of polarised light suggests the existence of a preferential direction of the macrocyclic rings with an edge-on arrangement with respect to the substrate surface. Finally, photoaction spectra were recorded from films deposited by only one horizontal lifting onto indium-tin-oxide (ITO) electrodes and the observed photocurrent increased notably with increasing transfer surface pressure. 相似文献
9.
N. Grobert M. Terrones S. Trasobares K. Kordatos H. Terrones J. Olivares J.P. Zhang Ph. Redlich W.K. Hsu C.L. Reeves D.J. Wallis Y.Q. Zhu J.P. Hare A.J. Pidduck H.W. Kroto D.R.M. Walton 《Applied Physics A: Materials Science & Processing》2000,70(2):175-183
We describe the generation of aligned carbon nanotube bundles and films by pyrolysis of solid organic precursors (for example 2-amino-4,6-dichloro-s-triazine, s-triaminotriazine) at 950-1050 °C over laser-patterned thin metal (Fe, Co, Ni) films, deposited on silica substrates. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies reveal that surface roughness of the laser-etched catalytic substrates plays a key role in achieving control of nanotube growth. We believe that, during the etching process, the energised (ablated) metal clusters condense and recrystallise evenly, possibly as the metal oxide, within the edges or surface of the eroded regions. During pyrolysis these catalytic particles, embedded in the silica substrates, are responsible for carbon agglomeration and subsequent tube axial growth, suggesting that nanotube alignment strongly depends upon the etching conditions (for example laser power, pulse duration, and focal distance). The pyrolysed products (usually nanotubes or nanofibres) were characterised by SEM, high-resolution transmission electron microscopy (HRTEM), electron energy loss spectroscopy (EELS) and energy dispersive X-ray spectroscopy (EDX). Samples containing only small amounts of amorphous carbon and other carbonaceous particles are notably absent. We observe that the degree of graphitisation is dependent upon the catalyst and the organic precursor. Interestingly, a nitrogen content З% was detected within the nanofibres, which exhibit corrugated graphite-like morphologies. This pyrolytic method may be used to advantage in generating aligned heteroatomic nanostructures such as BxCyNz systems. 相似文献
10.
Tatiana Da Ros Konstantinos Kordatos Maurizio Prato Edward J. Land Sydney Leach René V. Bensasson 《Research on Chemical Intermediates》2002,28(7-9):871-877
For a group of seven isomeric N-mTEG[60]fulleropyrrolidine bis-adducts (mTEG = CH2CH2OCH2CH2OCH2CH2OCH3), the quantum yields of singlet oxygen (O2, 1Δg) production and the maximum triplet molar absorption coefficients were found to be separately correlated with the shortest distances and with the number of bonds connecting the two addends on the fullerene sphere. 相似文献