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Fullerene C60

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https://www.readbyqxmd.com/read/28549332/synthesis-and-characterization-of-fullerene-modified-znalti-ldo-in-photo-degradation-of-bisphenol-a-under-simulated-visible-light-irradiation
#1
Liting Ju, Pingxiao Wu, Xiaolin Lai, Shanshan Yang, Beini Gong, Meiqing Chen, Nengwu Zhu
In this study, ZnAlTi layered double hydroxide (ZnAlTi-LDH) combined with fullerene (C60) was fabricated by the urea method, and calcined under vacuum atmosphere to obtain nanocomposites of C60-modified ZnAlTi layered double oxide (ZnAlTi-LDO). The morphology, structure and composition of the nanocomposites were analyzed by Scanning Electron Microscopy, High-resolution transmission electron microscopy, X-ray diffraction patterns, Fourier transform infrared and specific surface area. The UV-vis diffuse reflectance spectra indicated that the incorporation of C60 expanded the absorption of ZnAlTi-LDO to visible-light region...
May 23, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28548168/tuning-the-seebeck-effect-in-c60-based-hybrid-thermoelectric-devices-through-temperature-dependent-surface-polarization-and-thermally-modulated-interface-dipoles
#2
Yuchun Liu, Ling Xu, Chen Zhao, Ming Shao, Bin Hu
Fullerene (C60) is an important n-type organic semiconductor with high electron mobility and low thermal conductivity. In this work, we report the experimental results on the tunable Seebeck effect of C60 hybrid thin-film devices by adopting different oxide layers. After inserting n-type high-dielectric constant titanium oxide (TiOx) and zinc oxide (ZnO) layers, we observed a significantly enhanced n-type Seebeck effect in oxide/C60 hybrid devices with Seebeck coefficients of -5.8 mV K(-1) for TiOx/C60 and -2...
May 26, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28546887/energy-level-alignment-at-interfaces-between-manganese-phthalocyanine-and-c60
#3
Daniel Waas, Florian Rückerl, Martin Knupfer, Bernd Büchner
We have used photoelectron spectroscopy to determine the energy-level alignment at organic heterojunctions made of manganese phthalocyanine (MnPc) and the fullerene C60. We show that this energy-level alignment depends upon the preparation sequence, which is explained by different molecular orientations. Moreover, our results demonstrate that MnPc/C60 interfaces are hardly suited for application in organic photovoltaic devices, since the energy difference of the two lowest unoccupied molecular orbitals (LUMOs) is rather small...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28537281/comprehensive-theoretical-study-of-all-1812-c60-isomers
#4
Rebecca Sure, Andreas Hansen, Peter Schwerdtfeger, Stefan Grimme
We investigate all 1812 isomers of the fullerene C60 consistently with high-accuracy quantum chemistry methods. The isomers are optimized at the PBE-D3/def2-TZVP level of theory and their relative energies are obtained at the affordable and accurate hybrid-DFT level PW6B95-D3(ATM)/def2-QZVP. For the first time reliable values for the relative energy distribution among the 1812 isomers (maximum value of 549.1 kcal mol(-1), average value of 189.8 ± 46.8 kcal mol(-1), 1267 isomers in an energy window of 150-250 kcal mol(-1)) are given...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28527736/the-effects-of-non-invasive-radiofrequency-electric-field-hyperthermia-on-biotransport-and-biodistribution-of-fluorescent-60-fullerene-derivative-in-a-murine-orthotopic-model-of-breast-adenocarcinoma
#5
Norman A Lapin, Martyna Krzykawska-Serda, Sean Dilliard, Yuri Mackeyev, Maciej Serda, Lon J Wilson, Steven A Curley, Stuart J Corr
The aim of this study is to understand the combined and differential biokinetic effects of radiofrequency (RF) electric-field hyperthermia as an adjunctive therapy to [60]fullerene nanoparticle-based drug delivery systems in targeting the micro-vasculature and micro-environments of breast cancer tumors. Intravital microscopy (IVM) is an ideal tool to provide the spatial and temporal resolution needed for quantification in this investigation. The water-soluble and fluorescent [60]fullerene derivative (C60-serPF) was designed to be an amphiphilic nanostructure, which is able to cross several biological membranes and accumulate in tumor tissues by passing through abnormally leaky tumor blood vessels...
May 17, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28525394/modified-denatured-lysozyme-effectively-solubilizes-fullerene-c60-nanoparticles-in-water
#6
Marialuisa Siepi, Jane Politi, Principia Dardano, Angela Amoresano, Luca De Stefano, Daria Maria Monti, Eugenio Notomista
Fullerenes, allotropic forms of carbon, have very interesting pharmacological effects and engineering applications. However, a very low solubility both in organic solvents and water hinders their use. Fullerene C60, the most studied among fullerenes, can be dissolved in water only in the form of nanoparticles of variable dimensions and limited stability. Here the effect on the production of C60 nanoparticles by native and denatured hen egg white lysozyme, a highly basic protein, has been systematically studied...
May 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28515662/tempo-functionalized-c60-fullerene-deposited-on-gold-surface-for-catalytic-oxidation-of-selected-alcohols
#7
Piotr Piotrowski, Joanna Pawłowska, Jarosław Grzegorz Sadło, Renata Bilewicz, Andrzej Kaim
C60TEMPO10 catalytic system linked to a microspherical gold support through a covalent S-Au bond was developed. The C60TEMPO10@Au composite catalyst had a particle size of 0.5-0.8 μm and was covered with the fullerenes derivative of 2.3 nm diameter bearing ten nitroxyl groups; the organic film showed up to 50 nm thickness. The catalytic composite allowed for the oxidation under mild conditions of various primary and secondary alcohols to the corresponding aldehyde and ketone analogues with efficiencies as high as 79-98%, thus giving values typical for homogeneous catalysis, while retaining at the same time all the advantages of heterogeneous catalysis, e...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28514167/quantum-dot-peptide-fullerene-bioconjugates-for-visualization-of-in-vitro-and-in-vivo-cellular-membrane-potential
#8
Okhil Kumar Nag, Michael H Stewart, Jeffrey R Deschamps, Kimihiro Susumu, Eunkeu Oh, Vassiliy Tsytsarev, Qinggong Tang, Alexander L Efros, Roman Vaxenburg, Bryan J Black, Yungchia Chen, Thomas J O'Shaughnessy, Stella H North, Lauren D Field, Philip E Dawson, Joseph J Pancrazio, Igor L Medintz, Yu Chen, Reha S Erzurumlu, Alan L Huston, James B Delehanty
We report the development of a quantum dot (QD)-peptide-fullerene (C60) electron transfer (ET)-based nanobioconjugate for the visualization of membrane potential in living cells. The bioconjugate is comprised of (1) a central QD electron donor, (2) a membrane-inserting peptidyl linker, and (3) a C60 electron acceptor. The photoexcited QD donor engages in ET with the C60 acceptor resulting in quenching of QD photoluminescence (PL) that tracks positively with the number of C60 moieties arrayed around the QD. The nature of the QD-capping ligand also modulates the quenching efficiency; a neutral ligand coating facilitates greater QD quenching than a negatively charged carboxylated ligand...
May 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28511875/visible-light-switched-cytosol-release-of-sirna-by-amphiphilic-fullerene-derivative-to-enhance-rnai-efficacy-in-vitro-and-in-vivo
#9
Jing Wang, Lifei Xie, Tao Wang, Fengxin Wu, Jie Meng, Jian Liu, Haiyan Xu
Cationic macromolecules are attractive for use as small interfering RNA (siRNA) carriers due to their performance in non-immunological reactions, customization during synthesis, and low costs compared to viral carriers. However, their low transfection efficiency substantially hinders their application in both clinical practices and academic research, which is mostly attributable to the low capacity of siRNA/cationic macromolecule complexes to escape lysosomes. To address this challenge, we designed an amphiphilic fullerene derivative (C60-Dex-NH2) for efficient and controllable siRNA delivery...
May 13, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28510432/diels-alder-cycloaddition-of-cyclopentadiene-and-c60-at-the-extreme-high-pressure
#10
Tao Yang, Ryoichi Fukuda, Roberto Cammi, Masahiro Ehara
High-pressure Diels-Alder cycloaddition reaction of fullerenes is an important synthetic method for the thermally stable cycloadducts. The effects of high pressure on the potential energy surfaces of Diels-Alder cycloaddition of cyclopentadiene and C60 were studied with a recently developed approach, the polarizable continuum model for extreme pressure (XP-PCM). It is revealed that the high pressure reduces the activation energies and increases reaction energies drastically, making the DA reaction more favorable...
May 26, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28507390/high-quality-pvd-graphene-growth-by-fullerene-decomposition-on-cu-foils
#11
J Azpeitia, G Otero-Irurueta, I Palacio, J I Martinez, N Ruiz Del Árbol, G Santoro, A Gutiérrez, L Aballe, M Foerster, M Kalbac, V Vales, F J Mompeán, M García-Hernández, J A Martín-Gago, C Munuera, M F López
We present a new protocol to grow large-area, high-quality single-layer graphene on Cu foils at relatively low temperatures. We use C60 molecules evaporated in ultra high vacuum conditions as carbon source. This clean environment results in a strong reduction of oxygen-containing groups as depicted by X-ray photoelectron spectroscopy (XPS). Unzipping of C60 is thermally promoted by annealing the substrate at 800ºC during evaporation. The graphene layer extends over areas larger than the Cu crystallite size, although it is changing its orientation with respect to the surface in the wrinkles and grain boundaries, producing a modulated ring in the low energy electron diffraction (LEED) pattern...
August 2017: Carbon
https://www.readbyqxmd.com/read/28507160/emergent-magnetism-at-transition-metal-nanocarbon-interfaces
#12
Fatma Al Ma'Mari, Matthew Rogers, Shoug Alghamdi, Timothy Moorsom, Stephen Lee, Thomas Prokscha, Hubertus Luetkens, Manuel Valvidares, Gilberto Teobaldi, Machiel Flokstra, Rhea Stewart, Pierluigi Gargiani, Mannan Ali, Gavin Burnell, B J Hickey, Oscar Cespedes
Charge transfer at metallo-molecular interfaces may be used to design multifunctional hybrids with an emergent magnetization that may offer an eco-friendly and tunable alternative to conventional magnets and devices. Here, we investigate the origin of the magnetism arising at these interfaces by using different techniques to probe 3d and 5d metal films such as Sc, Mn, Cu, and Pt in contact with fullerenes and rf-sputtered carbon layers. These systems exhibit small anisotropy and coercivity together with a high Curie point...
May 15, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28505565/dft-and-td-dft-theoretical-studies-on-photo-induced-electron-transfer-process-on-cefamandole-c60-nano-complex
#13
Avat Arman Taherpour, Morteza Jamshidi, Omid Rezaei
The C60 fullerene displays a considerable electronegativity. It has a unique photophysical and electrochemical behavior that can be used as a suitable drug carrier. In the present study, the interaction of C60 fullerene as an electron recipient with the Cefamandole antibiotic was investigated in both ground and excited states using DFT and TD-DFT methods. The study of the interaction of C60 and Cefamandole via electron localization function (ELF) and reduced density gradient (RDG) revealed that the complex formation is of van der Waals type...
April 27, 2017: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/28504413/-60-fullerene-based-macrocycle-ligands
#14
Liangbing Gan, Yanbang Li
Macrocycle ligands have three or more donor sites. Selective replacement of skeleton carbon atoms by heteroatoms and vacancies in C60 could lead to various macrocycle ligands with a cage-shaped backbone. Theoretical calculations indicate that such C60-based macrocycle ligands are as stable as C60 thermodynamically according to their similar HOMO-LUMO gaps. The synthesis of these ligands is a challenging task. Nevertheless important progresses have been reported. This concept article focuses on the structures of possible C60-based macrocycle ligands and related synthetic results...
May 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28498660/a-self-assembled-ruthenium-ii-porphyrin-aluminium-iii-porphyrin-fullerene-triad-for-long-lived-photoinduced-charge-separation
#15
Agnese Amati, Paolo Cavigli, Axel Kahnt, Maria Teresa Indelli, Elisabetta Iengo
A very efficient metal-mediated strategy led, in a single step, to a quantitative construction of a new three-component multi-chromophoric system containing one fullerene monoadduct, one aluminium(III) monopyridylporphyrin, and one ruthenium(II) tetraphenylporphyrin. The Al(III) monopyridylporphyrin component plays the pivotal role in directing the correct self-assembly process, and behaves as the antenna unit for the photoinduced processes of interest. A detailed study of the photophysical behavior of the triad was carried out in different solvents (DCM, THF, Toluene) by stationary and time-resolved emission and absorption spectroscopy in the pico- and nanosecond time domains...
May 12, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28493717/-2-2-type-reaction-of-metal-metal-%C3%AF-bond-with-fullerene-forming-an-%C3%AE-1-c60-metal-complex-mechanistic-details-of-formation-reaction-and-prediction-of-a-new-%C3%AE-1-c60-metal-complex
#16
Hong Zheng, Xiang Zhao, Shigeyoshi Sakaki
C60[CpRu(CO)2]2 is only one transition-metal fullerene complex with pure η(1)-coordinated bonds, which was recently synthesized through the reaction between dinuclear Ru complex [CpRu(CO)2]2 and C60. Though new properties can be expected in the η(1)-coordinated metal-fullerene complex, its characteristic features are unclear, and the [2 + 2]-type formation reaction is very slow with a very small yield. A density functional theory study discloses that the η(1)-coordinated bond is formed by a large overlap between the Ru dσ orbital and C pσ one involved in the lowest unoccupied molecular orbital (LUMO) (π*) of C60 unlike the well-known η(2)-coordinated metal-fullerene complex which has a π-type coordinate bond with metal dπ orbital...
May 11, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28492309/competitive-inhibition-mechanism-of-acetylcholinesterase-without-catalytic-active-site-interaction-study-on-functionalized-c60-nanoparticles-via-in-vitro-and-in-silico-assays
#17
Yanyan Liu, Bing Yan, David A Winkler, Jianjie Fu, Aiqian Zhang
Acetylcholinesterase (AChE) activity regulation by chemical agents or, potentially, nanomaterials is important for both toxicology and pharmacology. Competitive inhibition via direct catalytic active sites (CAS) binding or noncompetitive inhibition through interference with substrate/product entering/exiting has been recognized previously as an AChE inhibition mechanism for bespoke nanomaterials. The competitive inhibition by peripheral anionic site (PAS) interaction without CAS binding remains unexplored. Here we proposed and verified the occurrence of a presumed competitive inhibition of AChE without CAS binding for hydrophobically functionalized C60 nanoparticles (NPs) by employing both experimental and computational methods...
May 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28488697/selective-c70-encapsulation-by-a-robust-octameric-nanospheroid-held-together-by-48-cooperative-hydrogen-bonds
#18
Grzegorz Markiewicz, Anna Jenczak, Michał Kołodziejski, Julian J Holstein, Jeremy K M Sanders, Artur R Stefankiewicz
Self-assembly of multiple building blocks via hydrogen bonds into well-defined nanoconstructs with selective binding function remains one of the foremost challenges in supramolecular chemistry. Here, we report the discovery of a enantiopure nanocapsule that is formed through the self-assembly of eight amino acid functionalised molecules in nonpolar solvents through 48 hydrogen bonds. The nanocapsule is remarkably robust, being stable at low and high temperatures, and in the presence of base, presumably due to the co-operative geometry of the hydrogen bonding motif...
May 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/28487818/modeling-adsorption-of-brominated-chlorinated-and-mixed-bromo-chloro-dibenzo-p-dioxins-on-c60-fullerene-using-nano-qspr
#19
Piotr Urbaszek, Agnieszka Gajewicz, Celina Sikorska, Maciej Haranczyk, Tomasz Puzyn
Many technological implementations in the field of nanotechnology have involved carbon nanomaterials, including fullerenes such as the buckminsterfullerene, C60. The unprecedented properties of such organic nanomaterials (in particular their large surface area) gained extensive attention for their potential use as organic pollutant sorbents. Sorption interactions can be very hazardous and useful at the same time. This work investigates the influence of halogenation by bromine and/or chlorine in dibenzo-p-dioxins on their sorption ability on the C60 fullerene surface...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28486809/crystallographic-structure-determination-of-both-5-6-and-6-6-isomers-of-lithium-ion-containing-dipheylmethano-60-fullerene
#20
Hiroshi Okada, Hiroki Kawakami, Shinobu Aoyagi, Yutaka Matsuo
Organic functionalization of lithium-ion-containing [60]fullerene, Li+@C60, was performed by using diphenyl(diazo)methane as a stable, readily available diazo compound to obtain lithium-ion-encapsulated [5,6]- and [6,6]-diphenylmethano[60]fullerenes, Li+@C61Ph2. The bis(trifluoromethanesulfonyl)imide (TFSI) salts of [5,6]- and [6,6]-Li+@C61Ph2 were successfully separated by using a cation exchange column with eluent containing LiTFSI. Improved separation protocol and high crystallinity of ionic components in less polar solvents enabled separate crystallization of each isomer...
May 10, 2017: Journal of Organic Chemistry
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