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Fullerene C60

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https://www.readbyqxmd.com/read/29031129/a-dual-type-responsive-electrochemical-immunosensor-for-quantitative-detection-of-pcsk9-based-on-n-c60-pdpt-n-gnrs-and-pt-poly-methylene-blue-nanocomposites
#1
Yan Li, Junlin He, Jun Chen, Yazhen Niu, Yilin Zhao, Yuchan Zhang, Chao Yu
In this study, a dual-type responsive electrochemical immunosensor was developed for the quantitative detection of proprotein convertase subtilisin/kexin type 9 (PCSK9), a potential biomarker of cardiovascular disease in serum. N-doped graphene nanoribbons (N-GNRs) with good conductivity were used as the sensing matrix modifying the glassy carbon electrode. Palladium platinum alloy (PdPt) nanoparticles with high catalytic performance toward the reduction of hydrogen peroxide (H2O2) were reduced onto amino-functionalized fullerene (n-C60-PdPt) and significantly amplified the electrochemical signal recorded by the amperometric i-t curve...
September 28, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29028170/mediating-reductive-charge-shift-reactions-in-electron-transport-chains
#2
Maximilian Wolf, Carmen Villegas, Olga Trukhina, Juan Luis Delgado, Tomas Torres, Nazario Martín, Timothy Clark, Dirk M Guldi
We report the synthesis of a full-fledged family of covalent electron donor-acceptor1-acceptor2 conjugates and their charge-transfer characterization by means of advanced photophysical assays. Both Zn(II)Porphyrins and Zn(II)Phthalocyanines were linked to different electron-transport chains of pairs of electron accepting C60 and C70 fullerenes. In this way, a fine-tuned redox gradient is established to power a unidirectional, long-range charge transport from the excited-state electron donor via a transient C60•- towards C70•-...
October 13, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29022343/synthesis-and-crystal-structure-of-li-fluoreno-60-fullerene-effect-of-encapsulated-lithium-ion-on-electrochemistry-of-spiroannelated-fullerene
#3
Hiroshi Ueno, Hiroshi Okada, Shinobu Aoyagi, Yutaka Matsuo
The reaction of [Li+@C60]TFSI- (TFSI = bis(trifluoromethanesulfonyl)imide) with 9-diazofluorene directly produced a [6,6]-adduct of lithium-ion-containing fluoreno[60]fullerene, [6,6]-[Li+@C60(fluoreno)]TFSI-. X-ray structure analysis revealed the spiro-fullerene structure of fluoreno[60]fullerene and unusual localization of the encapsulated Li+ at three different positions. Cyclic voltammetry of the compound showed a reversible one-electron reduction wave at -0.51 V (vs Fc/Fc+) and an irreversible reduction wave for the second electron...
October 12, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28968105/charge-transfer-dynamics-in-the-lowest-excited-state-of-a-pentacene-fullerene-complex-implications-for-organic-solar-cells
#4
Saju Joseph, Mahesh Kumar Ravva, Jean-Luc Bredas
We characterize the dynamic nature of the lowest excited state in a pentacene/C60 complex on the femtosecond time scale, via a combination of ab initio molecular dynamics and time-dependent density functional theory. We analyze the correlations between the molecular vibrations of the complex and the oscillations in the electron-transfer character of its lowest excited state, which point to vibration-induced coherences between the (pentacene-based) local-excitation (LE) state and the complex charge-transfer (CT) state...
October 9, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28956926/-60-fullerene-l-amino-acids-and-peptides-synthesis-under-phase-transfer-catalysis-using-a-phosphine-borane-linker-electrochemical-behavior
#5
Pauline Minois, Jérôme Bayardon, Rita Meunier-Prest, Sylvain Jugé
A new method to link amino acid and peptide derivatives to [60]fullerene is described. It uses hydrophosphination with a secondary phosphine borane. First, the stereoselective synthesis of secondary phosphine borane amino acid derivatives was achieved by alkylation of phenylphosphine borane with γ-iodo-α-amino ester reagents under phase-transfer catalysis (PTC). Second, a sec-phosphine borane amino ester was saponified and coupled with α,γ-diamino esters to afford the corresponding dipeptide derivatives in good yields...
October 12, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28952644/transition-metal-catalyzed-divergent-functionalization-of-60-fullerene-with-propargylic-esters
#6
Michio Yamada, Rika Ochi, Yuhei Yamamoto, Sae Okada, Yutaka Maeda
We have demonstrated that transition-metal-catalyzed divergent reactions between [60]fullerene (C60) and propargylic esters allow easy access to formal [2 + 2] and [4 + 2] cycloadducts in reasonable yields, and that the production ratios depend on the metal catalyst used. The molecular structures of the cycloadducts were characterized by means of spectroscopic analyses and theoretical calculations. A plausible reaction mechanism is proposed that shows that two competing routes are likely to be involved after the initial transition-metal-activated cyclization of the carbonyl group and the C-C triple bond in the 6-endo-dig mode...
September 27, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28948986/a-theoretical-study-of-complexes-between-fullerenes-and-concave-receptors-with-interest-in-photovoltaics
#7
E M Cabaleiro-Lago, J Rodríguez-Otero, J A Carrazana-García
The complexation of the pristine fullerenes C60 and C70 and the endohedral fullerenes Sc3N@C80 and Sc3N@C68 has been tested using a series of hosts of different nature, including the buckybowls corannulene and sumanene, a zinc porphyrin, a chloro boron subphthalocyanine, and a corannulene pentasubstituted with nitrile groups. A systematic theoretical study has been carried out in order to explore both the strength of the interaction and the feasibility for electron transfer of the dimers. Dispersion is the main stabilizing contribution in these dimers, so both molecules orientate so as to maximize the number of close contacts among atoms...
October 11, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28947315/carbon-nanomaterials-alter-plant-physiology-and-soil-bacterial-community-composition-in-a-rice-soil-bacterial-ecosystem
#8
Yi Hao, Chuanxin Ma, Zetian Zhang, Youhong Song, Weidong Cao, Jing Guo, Guopeng Zhou, Yukui Rui, Liming Liu, Baoshan Xing
The aim of this study was to compare the toxicity effects of carbon nanomaterials (CNMs), namely fullerene (C60), reduced graphene oxide (rGO) and multi-walled carbon nanotubes (MWCNTs), on a mini-ecosystem of rice grown in a loamy potted soil. We measured plant physiological and biochemical parameters and examined bacterial community composition in the CNMs-treated plant-soil system. After 30 days of exposure, all the three CNMs negatively affected the shoot height and root length of rice, significantly decreased root cortical cells diameter and resulted in shrinkage and deformation of cells, regardless of exposure doses (50 or 500 mg/kg)...
September 22, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28945436/platinum-ii-based-convex-trigonal-prismatic-cages-via-coordination-driven-self-assembly-and-c60-encapsulation
#9
Mingming Zhang, Hongchuang Xu, Ming Wang, Manik Lal Saha, Zhixuan Zhou, Xuzhou Yan, Heng Wang, Xiaopeng Li, Feihe Huang, Nengfang She, Peter J Stang
The development of three-dimensional (3D) supramolecular coordination complexes is of great interest from both fundamental and application points of view because these materials are useful in molecular catalysis, separation and purification, sensing, etc. Herein, we describe the synthesis of two Klärner's molecular-clip-based tetrapyridyl donors, which possess a C-shaped structure as shown by X-ray analysis, and subsequently use them to prepare four convex trigonal-prismatic cages via coordination-driven self-assembly with two 180° diplatinum(II) acceptors...
September 25, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28945341/biocompatible-60-70-fullerenols-potent-defense-against-oxidative-injury-induced-by-reduplicative-chemotherapy
#10
Yue Zhou, Jie Li, Haijun Ma, Mingming Zhen, Jun Guo, Liping Wang, Li Jiang, Chunying Shu, Chunru Wang
Chemotherapy as a conventional cancer treatment suffers from critical systemic side effects, which is generally considered as the consequence of reactive oxygen species (ROS). Fullerenes have been widely studied for their excellent performance in radicals scavenging. In the present study, we report a solid-liquid reaction to synthesize fullerenols and their application as ROS scavengers in chemotherapy protection. The solid-liquid reaction is carried out without catalyst and suitable for mass production. The novel [60]/[70] fullerenols show a high stability in water and the [70] fullerenols (C70-OH) exhibit the superior radical scavenging capability to [60] fullerenols (C60-OH) in the chemotherapy protection...
September 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28941714/intravenous-injection-of-unfunctionalized-carbon-based-nanomaterials-confirms-the-minimal-toxicity-observed-in-aqueous-and-dietary-exposures-in-juvenile-rainbow-trout-oncorhynchus-mykiss
#11
David Boyle, Paul A Sutton, Richard D Handy, Theodore B Henry
Numerous ecotoxicology studies of carbon-based nanomaterials (CNMs) have been conducted in fishes; however, different approaches have been used to make CNM dispersions and dose tanks for aqueous exposures, and to prepare food containing CNMs for dietary studies. This diversity of experimental methods has led to conflicting results and difficulties in comparing studies. The objective of the present study was to evaluate intravenous injection of unfunctionalized CNMs in rainbow trout (Oncorhynchus mykiss), as a means of delivering a known internal dose, on tissue biochemistry and histopathological lesions; then, subsequently, to compare the results with our previous work on aqueous and dietary exposures of rainbow trout to CNMs...
September 20, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28936516/neural-differentiation-on-aligned-fullerene-c60-nanowhiskers
#12
Fu-Yu Hsieh, Lok Kumar Shrestha, Katsuhiko Ariga, Shan-Hui Hsu
Highly-aligned fullerene nanowhiskers (C60 NWs) are prepared by a modified liquid-liquid interfacial precipitation method. Neural stem cells on the aligned C60 NWs are oriented and have a high capacity to differentiate into mature neurons. The aligned C60 NWs can serve as a functional scaffold for neural tissue engineering.
October 5, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28924237/structural-transformation-of-biochar-black-carbon-by-c60-superstructure-environmental-implications
#13
Minori Uchimiya, Joseph J Pignatello, Jason C White, Szu-Tung Hu, Paulo J Ferreira
Pyrogenic carbon is widespread in soil due to wildfires, soot deposition, and intentional amendment of pyrolyzed waste biomass (biochar). Interactions between engineered carbon nanoparticles and natural pyrogenic carbon (char) are unknown. This study first employed transmission electron microscopy (TEM) and X-ray diffraction (XRD) to interpret the superstructure composing aqueous fullerene C60 nanoparticles prepared by prolonged stirring of commercial fullerite in water (nC60-stir). The nC60-stir was a superstructure composed of face-centered cubic (fcc) close-packing of near-spherical C60 superatoms...
September 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28906122/tip-triggered-thermal-cascade-manipulation-of-magic-number-gold-fullerene-clusters-in-the-scanning-tunnelling-microscope
#14
Dogan Kaya, Deliang Bao, Richard E Palmer, Shixuan Du, Quanmin Guo
We demonstrate cascade manipulation between magic number gold-fullerene hybrid clusters by channelling thermal energy into a specific reaction pathway with a trigger from the tip of a scanning tunnelling microscope (STM). The (C60)m-Aun clusters, formed via self-assembly on the Au(111) surface, consist of n Au atoms and m C60 molecules; the three smallest stable clusters are (C60)7-Au19, (C60)10-Au35, and (C60)12-Au49. The manipulation cascade was initiated by driving the STM tip into the cluster followed by tip retraction...
October 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28902447/synthesis-of-monodisperse-silica-microspheres-and-modification-with-diazoresin-for-mixed-mode-ultra-high-performance-liquid-chromatography-separations
#15
Hailin Cong, Bing Yu, Chao Tian, Shuai Zhang, Hua Yuan
Monodisperse silica particles with average diameters of 1.9-2.9 μm were synthesized by a modified Stöber method, in which tetraethyl orthosilicate was continuously supplied to the reaction mixture containing KCl electrolyte, water, ethanol and ammonia. The obtained silica particles were modified by self-assembly with positively charged photosensitive diazoresin on the surface. After treatment with ultraviolet light, the ionic bonding between silica and diazoresin was converted into covalent bonding through a unique photochemistry reaction of diazoresin...
September 13, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28901579/formation-and-photodynamic-behavior-of-transition-metal-dichalcogenide-nanosheet-fullerene-inorganic-organic-nanohybrids-on-semiconducting-electrodes
#16
Jinseok Baek, Tomokazu Umeyama, Wookjin Choi, Yusuke Tsutsui, Hiroki Yamada, Shu Seki, Hiroshi Imahori
Composite films consisting of C60 and well-exfoliated nanosheets of transition metal dichalcogenides (TMDs), i.e., MoS2 or WS2, with a bulk heterojunction structure were facilely fabricated onto a semiconducting SnO2 electrode via a two-step methodology; self-assembly into their composite aggregates by injecting poor solvent into good solvent with the dispersion and subsequent electrophoretic deposition. Photoexcitation of the composites on SnO2 exhibited enhanced transient conductivities in comparison with single components of TMDs or C60, demonstrating that the bulk heterojunction nanostructure of TMD and C60 promoted the charge separation (CS)...
September 13, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28900603/a-nanocomplex-of-c60-fullerene-with-cisplatin-design-characterization-and-toxicity
#17
Svitlana Prylutska, Svitlana Politenkova, Kateryna Afanasieva, Volodymyr Korolovych, Kateryna Bogutska, Andriy Sivolob, Larysa Skivka, Maxim Evstigneev, Viktor Kostjukov, Yuriy Prylutskyy, Uwe Ritter
The self-organization of C60 fullerene and cisplatin in aqueous solution was investigated using the computer simulation, dynamic light scattering and atomic force microscopy techniques. The results evidence the complexation between the two compounds. The genotoxicity of С60 fullerene, Cis and their complex was evaluated in vitro with the comet assay using human resting lymphocytes and lymphocytes after blast transformation. The cytotoxicity of the mentioned compounds was estimated by Annexin V/PI double staining followed by flow cytometry...
2017: Beilstein Journal of Nanotechnology
https://www.readbyqxmd.com/read/28891990/efficient-inverted-organic-solar-cells-based-on-a-fullerene-derivative-modified-transparent-cathode
#18
Yifan Wang, Hailin Cong, Bing Yu, Zhiguo Zhang, Xiaowei Zhan
Indium tin oxide (ITO) is a transparent conductive material which is extensively used in organic solar cells (OSCs) as electrodes. In inverted OSCs, ITO is usually employed as a cathode, which should be modified by cathode buffer layers (CBLs) to achieve better contact with the active layers. In this paper, an amine group functionalized fullerene derivative (DMAPA-C60) is used as a CBL to modify the transparent cathode ITO in inverted OSCs based on PTB7 as a donor and PC71BM as an acceptor. Compared with traditional ZnO CBL, DMAPA-C60 exhibited comparable transmittance...
September 11, 2017: Materials
https://www.readbyqxmd.com/read/28891199/metal-based-diversity-for-crystalline-metal-fullerene-frameworks
#19
Andreas Kraft, Chantal Roger, David Schmidt, Johannes Stangl, Klaus Müller-Buschbaum, Florian Beuerle
Four different three-dimensional metal-fullerene frameworks were synthesized through polymerization of two C60 -derived dodecaacids with varying alkyl spacers in the presence of Ca(2+) , Cu(2+) or Cd(2+) ions. Structural analysis of the frameworks was performed by single-crystal X-ray diffraction and porosity of the materials was investigated by sorption measurements.
September 10, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28885832/flattened-calixarene-like-cyclic-bodipy-array-a-new-photosynthetic-antenna-model
#20
Xian-Sheng Ke, Taeyeon Kim, Vincent M Lynch, Dongho Kim, Jonathan L Sessler
A cyclic BODIPY array, characterized by a rigid flattened calixarene-like conformation, acts as a photosynthetic antenna mimic. The system in question, triBODIPY, is a better antenna than the corresponding BF2-free ligand. On the basis of absorption spectral studies and supporting calculations, it is concluded that exciton coupling between the BODIPY subunits occurs readily. TriBODIPY supports a complex with Li(+)@C60 that bring an antenna-like light absorber into close proximity to an electronic acceptor without the need for linking spacers...
September 21, 2017: Journal of the American Chemical Society
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