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Fullerene C60

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https://www.readbyqxmd.com/read/28325349/nanocrystalline-cellulose-fullerene-novel-conjugates
#1
A Herreros-López, M Carini, T Da Ros, T Carofiglio, C Marega, V La Parola, V Rapozzi, L E Xodo, Ali A Alshatwi, C Hadad, M Prato
The covalent grafting of two amino-fullerene C60 derivatives (C60-LC-NH2 and C60-SC-NH2, LC=long chain and SC=short chain) onto the surface of TEMPO oxidized nanocrystalline cellulose (NCC-COOH) has been reported for the first time. These hybrids (NCC-LC-C60 and NCC-SC-C60) form stable colloidal suspensions at concentrations up to 0.5mg/mL and act as effective photosensitizers for singlet oxygen production as demonstrated by the oxidation of L-methionine-methyl ester to the corresponding sulphoxide. Using the same approach, in a one-pot reaction both a fluorescent target molecule (FITC-LC-NH2) and the C60-LC-NH2 derivative have been successfully attached covalently onto the NCC-COOH surface...
May 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28319037/monitoring-the-transformation-of-aliphatic-and-fullerene-molecules-by-high-energy-electrons-using-surface-enhanced-raman-spectroscopy
#2
Nassir Mojarad, Jean-Nicolas Tisserant, Hannes Beyer, Hao Dong, Patrick A Reissner, Yuriy Fedoryshyn, Andreas Stemmer
We report on using 100 keV electrons to obtain amorphous carbon from aliphatic and fullerene molecules, and study this process by monitoring their Raman signal. In this regard, we use self-assembled monolayers of gold nanoparticles to provide high electromagnetic field enhancement, which allows the detection of the Raman signal from even nanometer-thick layers of analyte. Our results show different dynamics in the amorphization process of the two molecules, although both show suppression of their original vibrational resonances even at low exposure doses...
March 20, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28318261/expanded-rosarin-a-versatile-fullerene-c60-receptor
#3
Xian-Sheng Ke, Taeyeon Kim, James T Brewster, Vincent M Lynch, Dongho Kim, Jonathan L Sessler
An expanded rosarian (P3P6) with a bowl-like conformation has been prepared and characterized. It is prepared in a one pot procedure that involves condensing a bispyrrole pyridine precursor (P1P2) with benzaldehyde, followed by oxidation. Single crystal X-ray diffraction analysis reveals a bowl-like conformation in the solid state with an upper rim diameter defined by the meso-phenyl substituents of ca. 13.5 Å and a depth of roughly 6.3 Å. P3P6 forms both 1:1 and 2:1 complexes with C60 in the solid state...
March 20, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28315688/fullerenol-nanoparticles-prevents-doxorubicin-induced-acute-hepatotoxicity-in-rats
#4
Vesna Jacevic, Aleksandar Djordjevic, Branislava Srdjenovic, Vukosava Milic-Tores, Zoran Segrt, Viktorija Dragojevic-Simic, Kamil Kuca
Doxorubicin (DOX), commonly used antineoplastic agent, affects bone marrow, intestinal tract and heart, but it also has some hepatotoxic effects. Main mechanism of its toxicity is the production of free reactive oxygen species. Polyhidroxilated C60 fullerene derivatives, fullerenol nanoparticles (FNP), act as free radical scavengers in in vitro systems. The aim of the study was to investigate potential FNP protective role against DOX-induced hepatotoxicity in rats. Experiments were performed on adult male Wistar rats...
March 16, 2017: Experimental and Molecular Pathology
https://www.readbyqxmd.com/read/28301165/theoretical-study-of-addition-reactions-of-l4m-m-rh-ir-and-l2m-m-pd-pt-to-li-c60
#5
Ming-Chung Yang, Akhilesh K Sharma, W M C Sameera, Keiji Morokuma, Ming-Der Su
The addition reaction of M(Cl)(CO)(PPh3)2 (M = Rh, Ir) and M(PPh3)2 (M = Pd, Pt) fragments with X@C60 (X = 0, Li(+)) were characterized by density functional theory (DFT) and the artificial force-induced reaction (AFIR) method. The calculated free energy profiles suggested that the η(2)[6:6]-addition is the most favorable reaction, which is consistent with the experimental observations. In the presence of Li(+) ion, the reaction is highly exothermic, leading to η(2)[6:6] product of L4IrLi(+)@C60. In contrast, an endothermic reaction was observed in the absence of a Li(+) ion...
March 24, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28300342/a-stable-soluble-and-crystalline-supramolecular-system-with-a-triplet-ground-state
#6
Tsukasa Futagoishi, Tomoko Aharen, Tatsuhisa Kato, Azusa Kato, Toshiyuki Ihara, Tomofumi Tada, Michihisa Murata, Atsushi Wakamiya, Hiroshi Kageyama, Yoshihiko Kanemitsu, Yasujiro Murata
A supramolecular complex was constructed by encapsulation of a (3) O2 molecule inside an open-cage C60 derivative. Its single-crystal X-ray diffraction analysis revealed the presence of the (3) O2 at the center of the fullerene cage. The CV measurements suggested that unprecedented dehydrogenation was promoted by the encapsulated (3) O2 after two-electron reduction. The ESR measurements displayed the triplet character as well as the anisotropy of the (3) O2 . Additionally, the SQUID measurements also demonstrated the paramagnetic behavior above 3 K without an antiferromagnetic transition...
March 16, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28284703/high-resolution-monochromated-electron-energy-loss-spectroscopy-of-organic-photovoltaic-materials
#7
Jessica A Alexander, Frank J Scheltens, Lawrence F Drummy, Michael F Durstock, Fredrik S Hage, Quentin M Ramasse, David W McComb
Advances in electron monochromator technology are providing opportunities for high energy resolution (10 - 200meV) electron energy-loss spectroscopy (EELS) to be performed in the scanning transmission electron microscope (STEM). The energy-loss near-edge structure in core-loss spectroscopy is often limited by core-hole lifetimes rather than the energy spread of the incident illumination. However, in the valence-loss region, the reduced width of the zero loss peak makes it possible to resolve clearly and unambiguously spectral features at very low energy-losses (<3eV)...
March 2, 2017: Ultramicroscopy
https://www.readbyqxmd.com/read/28281332/tightly-bound-double-caged-60-fullerene-derivatives-with-enhanced-solubility-structural-features-and-application-in-solar-cells
#8
Victor A Brotsman, Vitaliy A Ioutsi, Alexey V Rybalchenko, Vitaliy Yu Markov, Nikita M Belov, Natalia S Lukonina, Sergey I Troyanov, Ilya N Ioffe, Vasiliy A Trukhanov, Galina K Galimova, Artur A Mannanov, Dmitry N Zubov, Erhard Kemnitz, Lev N Sidorov, Tatiana V Magdesieva, Dmitry Yu Paraschuk, Alexey A Goryunkov
A series of novel highly soluble double-caged [60]fullerene derivatives were prepared by means of lithium salt-assisted [2+3]-cycloaddition. The bispheric molecules feature rigid linking of the fullerene spheres via a four-membered cycle and a pyrrolizidine bridge with an ester function CO2R (R=n-decyl, n-octadecyl, benzyl, and n-butyl: compounds 1a-d, respectively), as demonstrated by NMR spectroscopy and X-ray diffraction. Cyclic voltammetry studies revealed three closely overlapping pairs of reversible peaks due to consecutive one-electron reductions of fullerene cages, as well as an irreversible oxidation peak attributed to abstraction of an electron from the nitrogen lone electron pair...
March 9, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28280822/molecular-dynamics-simulation-study-of-translocation-of-fullerene-c60-through-skin-bilayer-effect-of-concentration-on-barrier-properties
#9
Rakesh Gupta, Beena Rai
The molecular level permeation mechanism of fullerenes and its derivatives through human skin could open a vast area for designing novel nanoparticles for cosmetics and drug delivery applications. In this study, we report the permeation mechanism of pristine fullerene C60 for the first time through the skin lipid layer, as determined via prolonged unconstrained and constrained coarse-grained molecular dynamics simulations. The skin layer was modelled as an equimolar ratio of ceramides, cholesterol and free fatty acids...
March 10, 2017: Nanoscale
https://www.readbyqxmd.com/read/28273922/the-role-of-super-atom-molecular-orbitals-in-doped-fullerenes-in-a-femtosecond-intense-laser-field
#10
Hui Xiong, Benoit Mignolet, Li Fang, Timur Osipov, Thomas J A Wolf, Emily Sistrunk, Markus Gühr, Francoise Remacle, Nora Berrah
The interaction of gas phase endohedral fullerene Ho3N@C80 with intense (0.1-5 × 10(14) W/cm(2)), short (30 fs), 800 nm laser pulses was investigated. The power law dependence of Ho3N@C80(q+), q = 1-2, was found to be different from that of C60. Time-dependent density functional theory computations revealed different light-induced ionization mechanisms. Unlike in C60, in doped fullerenes, the breaking of the cage spherical symmetry makes super atomic molecular orbital (SAMO) states optically active...
December 2017: Scientific Reports
https://www.readbyqxmd.com/read/28263053/water-soluble-fullerene-derivatives-as-brain-medicine-surface-chemistry-determines-if-they-are-neuroprotective-and-antitumor
#11
Fu-Yu Hsieh, A V Zhilenkov, I I Voronov, E A Khakina, D V Mischenko, Pavel A Troshin, Shan-Hui Hsu
Delivering drugs to the central nervous system (CNS) is a major challenge in treating CNS-related diseases. Nanoparticles that can cross blood-brain barrier (BBB) are potential tools. In this study, water-soluble C60 fullerene derivatives with different types of linkages between the fullerene cage and the solubilizing addend were synthesized (compounds 1-3: C-C bonds, compounds 4-5: C-S bonds, compound 6: C-P bonds, and compounds 7-9: C-N bonds). Fullerene derivatives 1-6 were observed to induce neural stem cell (NSC) proliferation in vitro and rescue the function of injured CNS in zebrafish...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28262609/synthesis-of-fullerene-c60-monoadduct-based-water-compatible-imprinted-micelles-for-electrochemical-determination-of-chlorambucil
#12
Bhim Bali Prasad, Ragini Singh, Anil Kumar
A novel water-compatible C60-monoadduct based imprinted micelles was synthesized by the self-assembly of vinylic-C60-monoadduct with sodium dodecylsulfate micellar system, in the presence of chlorambucil as a model template (anticancer drug). After template retrieval with acetonitrile, these imprinted micelles were immobilized at the surface of ionic liquid decorated carbon ceramic electrode. Herein, C60-monoadduct (the head group of micelle) actually served as a nanomediator for electronic transmission across multiple interfaces...
February 24, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28248451/hierarchical-fullerene-assembly-seeded-coprecipitation-and-electric-field-directed-assembly
#13
Angela C Stelson, Sonny J Penterman, Chekesha M Liddell Watson
Hierarchical C60 colloidal films are assembled from nanoscale to macroscale. Fullerene molecular crystals are grown via seeded cosolvent precipitation with mixed solvent [tetrahydronaphthalene (THN)/trimethylpyridine (TMP)] and antisolvent 2-propanol. The fullerene solutions are aged under illumination, which due to the presence of TMP reduces the free monomer concentration through fullerene aggregation into nanoparticles. The nanoparticles seed the growth of monodisperse fullerene colloids on injection into the antisolvent...
March 1, 2017: Small
https://www.readbyqxmd.com/read/28248094/a-multidimensional-view-of-charge-transfer-excitons-at-organic-donor-acceptor-interfaces
#14
Ti Wang, Tika R Kafle, Bhupal Kattel, Wai-Lun Chan
How tightly bound charge transfer (CT) excitons dissociate at organic donor-acceptor interfaces has been a long-standing question in the organic photovoltaics community. Recently, it has been proposed that exciton delocalization reduces the exciton binding energy and promotes exciton dissociation. In order to understand this mechanism, it is critical to resolve the evolution of the exciton's binding energy and coherent size with femtosecond time resolution. However, because the coherent size is just a few nanometers, it presents a major experimental challenge to capture the CT process simultaneously in the energy, spatial, and temporal domains...
March 10, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28235359/cytotoxic-effects-of-dimorfolido-n-trichloroacetylphosphorylamide-and-dimorfolido-n-benzoylphosphorylamide-in-combination-with-c60-fullerene-on-leukemic-cells-and-docking-study-of-their-interaction-with-dna
#15
S Prylutska, I Grynyuk, A Grebinyk, V Hurmach, Iu Shatrava, T Sliva, V Amirkhanov, Yu Prylutskyy, O Matyshevska, M Slobodyanik, M Frohme, U Ritter
Dimorfolido-N-trichloroacetylphosphorylamide (HL1) and dimorfolido-N-benzoylphosphorylamide (HL2) as representatives of carbacylamidophosphates were synthesized and identified by the methods of IR, (1)H, and (31)P NMR spectroscopy. In vitro HL1 and HL2 at 1 mM concentration caused cell specific and time-dependent decrease of leukemic cell viability. Compounds caused the similar gradual decrease of Jurkat cells viability at 72 h (by 35%). HL1 had earlier and more profound toxic effect as compared to HL2 regardless on leukemic cell line...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28228041/thermodynamics-of-hydration-of-fullerols-c60-oh-n-and-hydrogen-bond-dynamics-in-their-hydration-shells
#16
Sonanki Keshri, B L Tembe
Molecular dynamics simulations of fullerene and fullerols [C60(OH)n, where n = 2-30] in aqueous solutions have been performed for the purpose of obtaining a detailed understanding of the structural and dynamic properties of these nanoparticles in water. The structures, dynamics and hydration free energies of the solute molecules in water have been analysed. Radial distribution functions, spatial density distribution functions and hydrogen bond analyses are employed to characterize the solvation shells of water around the central solute molecules...
February 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28228000/c60-fullerene-as-promising-therapeutic-agent-for-the-prevention-and-correction-of-skeletal-muscle-functioning-at-ischemic-injury
#17
D M Nozdrenko, D O Zavodovskyi, T Yu Matvienko, S Yu Zay, K I Bogutska, Yu I Prylutskyy, U Ritter, P Scharff
The therapeutic effect of pristine C60 fullerene aqueous colloid solution (C60FAS) on the functioning of the rat soleus muscle at ischemic injury depending on the time of the general pathogenesis of muscular system and method of administration C60FAS in vivo was investigated. It was found that intravenous administration of C60FAS is the optimal for correction of speed macroparameters of contraction for ischemic muscle damage. At the same time, intramuscular administration of C60FAS shows pronounced protective effect in movements associated with the generation of maximum force responses or prolonged contractions, which increase the muscle fatigue level...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28225028/stacking-multiple-connecting-functional-materials-in-tandem-organic-light-emitting-diodes
#18
Tao Zhang, Deng-Ke Wang, Nan Jiang, Zheng-Hong Lu
Tandem device is an important architecture in fabricating high performance organic light-emitting diodes and organic photovoltaic cells. The key element in making a high performance tandem device is the connecting materials stack, which plays an important role in electric field distribution, charge generation and charge injection. For a tandem organic light-emitting diode (OLED) with a simple Liq/Al/MoO3 stack, we discovered that there is a significant current lateral spreading causing light emission over an extremely large area outside the OLED pixel when the Al thickness exceeds 2 nm...
February 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28221040/magnetic-fullerene-dna-hyaluronic-acid-nanovehicles-with-magnetism-reduction-dual-responsive-triggered-release
#19
Ling Wang, Yitong Wang, Jingcheng Hao, Shuli Dong
We created the dual-responsive nanovehicle that can effectively combine and abundantly utilize magnetic and glutathione (GSH)-reductive triggers to control the drug delivery and achieve more intelligent and powerful targeting. In the nanovehicles, paramagnetic fullerene (C60@CTAF) was prepared via one-step modification of fullerene with magnetic surfactant CTAF by hydrophobic interaction for the first time. The perfect conjugation of C60 and CTAF increased the solubility or dispersity of fullerenes and qualified CTAF with more powerful assembly capability with DNA...
March 13, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28218822/single-molecular-junction-study-on-h2o-c60-h2o-is-electrostatically-isolated
#20
Satoshi Kaneko, Yoshifumi Hashikawa, Shintaro Fujii, Yasujiro Murata, Manabu Kiguchi
A water molecule exhibits characteristic properties on the basis of hydrogen-bondings. In the past decade, a single water molecule placed in the non-hydrogen-bonding environment has attracted growing attention. To reveal fundamental properties of a single water molecule, endohedral fullerene H2O@C60 becomes an ideal and suitable model. We examined the electronic properties of H2O@C60 by applying the single-molecule measurement. The conductance of a single molecular junction based on H2O@C60 was found to be comparable with that of empty C60...
February 20, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
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