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Mengjun Chen, Baoyong Liu, Xiaolin Wang, Yanxu Fu, Jingcheng Hao, Hongguang Li
The formation of lamellar liquid crystals (LLCs) has been demonstrated in a few salt-free catanionic surfactant systems and their properties have been well documented. However, examples of their combination with other materials are relatively rare. Herein, a salt-free zero-charged catanionic surfactant with low chain melting temperature was prepared by mixing equimolar tetradecyltrimethylammonium oxide (TTAOH) and oleic acid (OA) in water, and its concentration-dependent aggregate transition was investigated...
August 16, 2017: Soft Matter
Yayun Peng, Dongzhi Yang, Weifei Lu, Xiongwei Hu, Hao Hong, Ting Cai
Various carbonaceous nanomaterials, including fullerene, carbon nanotube, graphene, and carbon dots, have attracted increasing attention during past decades for their potential applications in biological imaging and therapy. In this study, we have developed a fullerene-based tumor-targeted positron emission tomography (PET) imaging probe. Water-soluble functionalized C60 conjugates were radio-labeled with (64)Cu and modified with cyclo (Arg-Gly-Asp) peptides (cRGD) for targeting of integrin αvβ3 in glioblastoma...
August 8, 2017: Acta Biomaterialia
Yaxiong Wei, Miaomiao Zhou, Qiaohui Zhou, Xiaoguo Zhou, Shilin Liu, Song Zhang, Bing Zhang
Three new triplet photosensitizers consisting of a bodipy derivative and C60 moieties were synthesized for triplet-triplet annihilation upconversion of perylene. With the extension of the π-conjugated structure of the bodipy derivative, the three photosensitizers exhibited different absorption wavelengths, e.g. 517 nm for B-2, 532 nm for B-4, and 557 nm for B-6. The steady-state and transient absorption, steady-state fluorescence, and upconverted fluorescence emission were investigated to reveal step-by-step the dynamic processes of the above systems...
August 9, 2017: Physical Chemistry Chemical Physics: PCCP
Deng-Chen Yang, Meng Li, Chuan-Feng Chen
A new molecular tweezer with two corannulene subunits linked by a tetrahydro[5]helicene imide was conveniently synthesized, which showed highly sensitive and selective complexation of C70 over C60via concave-convex π-π interactions, and the KC70/KC60 value even was found to be 230/1.
August 17, 2017: Chemical Communications: Chem Comm
Baharan Karamzadeh, Thomas Eaton, David Muñoz Torres, Izabela Cebula, Marcel Mayor, Manfred Buck
Studying the stepwise assembly of a four component hybrid structure on Au(111)/mica, the pores of a hydrogen bonded bimolecular network of 3,4,9,10-perylenetetracarboxylic diimide (PTCDI) and 1,3,5-triazine-2,4,6-triamine (melamine) were partitioned by three and four-armed molecules based on oligo([biphenyl]-4-ylethynyl)benzene, followed by the templated adsorption of either C60 fullerene or adamantane thiol molecules. The characterisation by ambient scanning tunneling microscopy (STM) reveals that the pore modifiers exhibit dynamics which pronouncedly depend on the molecular structure...
August 7, 2017: Faraday Discussions
Edison Castro, Khalid Azmani, Andrea Hernandez Garcia, Amineh Aghabali, Shuming Liu, Alejandro Metta-Magana, Marilyn Olmstead, Antonio Rodriguez-Fortea, Josep Poblet, Luis Echegoyen
A totally unanticipated regio- and stereo-isomerically pure C₂h-symmetric trans-1-(bis-pyrrolidine)-tetra-malonate hexa-adduct of C₆₀ was obtained via a topologically controlled method, followed by a 1,3-dipolar cycloaddition reaction. The structures of the products were elucidated by ¹H- and ¹³C-NMR and by X-ray crystallography. The unexpected regio- and stereo-selectivity observed, supported by theoretical calculations, was found to be a consequence of malonate-pyrrolidine interactions.
August 4, 2017: Chemistry: a European Journal
Lung-Chien Chen, Jia-Ren Wu, Zhong-Liang Tseng, Cheng-Chiang Chen, Sheng Hsiung Chang, Jun-Kai Huang, King-Lien Lee, Hsin-Ming Cheng
This study determines the effects of annealing treatment on the structure and the optical and electronic behaviors of the mixed (FAPbI₃)1-x(MAPbBr₃)x perovskite system. The experimental results reveal that (FAPbI₃)1-x(MAPbBr₃)x (x ~ 0.2) is an effective light-absorbing material for use in inverted planar perovskite solar cells owing to its large absorbance and tunable band gap. Therefore, good band-matching between the (FAPbI₃)1-x(MAPbBr₃)x and C60 in photovoltaic devices can be controlled by annealing at various temperatures...
September 3, 2016: Materials
Bing Yu, Tao Xu, Hailin Cong, Qiaohong Peng, Muhammad Usman
By using the two-step activated swelling method, monodisperse porous poly(styrene-divinylbenzene) (P(S-DVB)) microparticles were successfully synthesized. The influence of porogens, swelling temperatures and crosslinking agents on the porosity of porous microparticles was carefully investigated. Porous P(S-DVB) microparticles were used as a packing material for high performance liquid chromatography (HPLC). Several benzene analogues were effectively separated in a stainless-steel column as short as 75 mm due to the high specific surface area of the porous microparticles...
April 22, 2017: Materials
Qinggang Tan, Yanyan Chu, Min Bie, Zihao Wang, Xiaoyan Xu
Biopolymer/inorganic material nanocomposites have attracted increasing interest as nanocarriers for delivering drugs owing to the combined advantages of both biopolymer and inorganic materials. Here, amphiphilic block copolymer/fullerene nanocomposites were prepared as nanocarriers for hydrophobic drug by incorporation of C60 in the core of methoxy polyethylene glycol-poly(d,l-lactic acid) (MPEG-PDLLA) micelles. The structure and morphology of MPEG-PDLLA/C60 nanocomposites were characterized using transmission electron microscopy, dynamic light scattering, high-resolution transmission electron microscopy, and thermal gravimetric analysis...
February 16, 2017: Materials
Ryoma Hayakawa, Toyohiro Chikyow, Yutaka Wakayama
Quantum molecular devices have a potential for the construction of new data processing architectures that cannot be achieved using current complementary metal-oxide-semiconductor (CMOS) technology. The relevant basic quantum transport properties have been examined by specific methods such as scanning probe and break-junction techniques. However, these methodologies are not compatible with current CMOS applications, and the development of practical molecular devices remains a persistent challenge. Here, we demonstrate a new vertical resonant tunneling transistor for large-scale integration...
August 1, 2017: Nanoscale
W C Lin, A Kovalsky, Y C Wang, L L Wang, S Goldberg, W L Kao, C Y Wu, H Y Chang, J J Shyue, C Burda
Perovskite solar cells have drawn much attention and achieved efficiencies over 22%, but relatively little is known about the long-term stability under photovoltaic operation. So far, stability studies have reported about the importance of degradation of each layer, but little to no consideration has been given to the whole device architecture. We investigated the stability of perovskite solar cells in order to fundamentally understand the mechanism behind efficiency improvement/degradation during device operation...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
Andrew J Musser, Prakash P Neelakandan, Johannes M Richter, Hirotaka Mori, Richard H Friend, Jonathan R Nitschke
We have prepared a series of M(II)4L6 tetrahedral cages containing one or the other of two distinct BODIPY moieties, as well as mixed cages that contain both BODIPY chromophores. The photophysical properties of these cages and their fullerene-encapsulated adducts were studied in depth. Upon cage formation, the charge-transfer character exhibited by the bis(aminophenyl)-BODIPY subcomponents disappeared. Strong excitonic interactions were instead observed between at least two BODIPY chromophores along the edges of the cages, arising from the electronic delocalization through the metal centers...
August 15, 2017: Journal of the American Chemical Society
Maximilian Wolf, Astrid Herrmann, Andreas Hirsch, Dirk M Guldi
Porphyrin arrays consisting of three peripheral Zinc porphyrins (ZnPs) and a central free base porphyrin (H2P)-all rigidly linked to each other-serve as light-harvesting antennas as well as electron donors and are flexibly coupled to an electron-accepting C60 to realize the unidirectional flow of (i) excited-state energy from the ZnPs at the periphery to the H2P, (ii) electrons to C60, and (iii) holes to H2P and, subsequently, to ZnP. Dynamics following photoexcitation are elucidated by time-resolved transient absorption measurements on the femto-, pico-, nano-, and microsecond time scales and are examined by multiwavelength as well as target analyses...
August 15, 2017: Journal of the American Chemical Society
Jean-Nicolas Tisserant, Tino Wagner, Patrick A Reissner, Hannes Beyer, Yuriy Fedoryshyn, Andreas Stemmer
Carbon materials promise a revolution in optoelectronics, medical applications, and sensing provided that their morphology can be controlled down to the nanometer scale. Nanoporous materials are particularly appealing as they offer a drastically enlarged interfacial area compared to the corresponding planar materials. Entire fields such as organic solar cells, catalysis, or sensing may profit from an enlarged interface and facilitated molecular interaction between a carbon material and the environment. Nanoporous fullerene thin films obtained by the deposition of suspended nanoclusters of fullerene were already reported but suffered from the limitation of the size of these particles to over 100 nm...
August 16, 2017: ACS Applied Materials & Interfaces
L V Tat'yanenko, E A Khakina, A V Zhilenkov, P A Troshin, O V Dobrokhotova, I Yu Pikhteleva, A I Kotel'nikov
We studied the effects of new water-soluble polysubstituted fullerene C60 (PFD) derivatives on activity of Ca(2+)-Mg(2+) ATPase of the sarcoplasmic reticulum and cGMP phosphodiesterase. All examined fullerene derivatives inhibited activity of both enzymes. For instance, PFD-I, PFD-II, PFD-III, PFD-V, PFD-IX, PFD-X, and PFD-XI in a concentration of 5×10(-5) M completely inhibited hydrolytic and transport functions of Ca(2+)-ATPase. These compounds in a concentration of 5×10(-6) suppressed active transport of calcium ions by 51±5, 77±8, 52±5, 52±5, 100±10, 80±8, and 100±10%, respectively, and inhibited ATP hydrolysis by 31±3, 78±8, 18±2, 29±3, 78±8, 63±7, and 73±9%, respectively, uncoupling the hydrolytic and transport functions of the enzyme...
July 25, 2017: Bulletin of Experimental Biology and Medicine
Felix J Rizzuto, Daniel M Wood, Tanya K Ronson, Jonathan R Nitschke
A porphyrin-edged metal-organic tetrahedron forms host-guest complexes containing 1-4 equiv of fullerene C60, depending on the solvent employed. The molecules of C60 were bound anticooperatively within well-defined pockets; an X-ray crystal structure of three fullerenes inside the tetrahedron was obtained. Electrochemical measurements revealed that the electron-accepting properties of the fullerenes inside the capsules were altered depending on the mode of encapsulation. The binding of multiple fullerenes was observed to increase the electron affinity of the overall cluster, providing a noncovalent method of tuning fullerene electronics...
August 16, 2017: Journal of the American Chemical Society
Kouta Sugikawa, Kentaro Kozawa, Masafumi Ueda, Atsushi Ikeda
Stepwise growth of fullerene nanoparticles (nCx; x=60 or 70) was performed through guest exchange of a γ-cyclodextrin (γ-CD) complex. Fullerenes bicapped by γ-CD were mixed with presynthesized nCx in the presence of polyethylene glycol (PEG) in water. Fullerenes expelled from the γ-CD hosts by PEG were piled on the original nCx, resulting in the growth of nCx. This process could be repeated and the size of nCx increased according to the number of growth steps. The growth of fullerene nanoparticles was confirmed by UV/Vis absorption spectroscopy, dynamic light scattering measurements, and transmission electron microscopy observations...
July 25, 2017: Chemistry: a European Journal
Supriya K Chaudhuri, Rajat K Chaudhuri, Prasanta K Mukherjee, Sudip Chattopadhyay
A relativistic study of spectroscopic properties of the endohedral fullerenes Ng@C60(q) (where Ng = He, Ne and q=0,±1,±2 are the charges) associated with the C60 molecule has been done using the equation of motion coupled cluster (EOM-CC) methodology. Specific properties estimated are the transition energies, dipole oscillator strengths, and transition probabilities for the low-lying excitations 1s(2)((1)S0) → 1snp ((1)P1) (n = 2, 3, 4) for He@C60(q) and 1s(2)2s(2)2p(6) ((1)S0) → 1s(2)2s(2)2p(5)ns∕nd ((1)P1) (n = 3, 4) for Ne@C60(q), which have been compared with those for the isolated atom to depict the confinement effect of the host molecule on the encapsulated atom...
July 21, 2017: Journal of Chemical Physics
Zong-Jun Li, Sisi Wang, Shu-Hui Li, Tao Sun, Wei-Wei Yang, Kazutaka Shoyama, Takafumi Nakagawa, Il Jeon, Xiaoniu Yang, Yutaka Matsuo, Xiang Gao
C60 o-quinodimethane bisadducts [C60(QM)2] are promising electron acceptors for bulk heterojuction (BHJ) organic solar cells (OSCs). However, previous production of C60(QM)2 often resulted in excessive regioisomers, which were difficult to purify and might consequently obscure the structure-performance study of the organofullerene acceptors. Herein, the electrosynthesis of C60(QM)2 is reported. The reaction exhibits a strong regiocontrol with generation of fewer regioisomers. Pure regioisomers of cis-2, trans-3, and e C60(QM)2 are obtained, and the structures are solved with single-crystal X-ray diffraction...
July 31, 2017: Journal of Organic Chemistry
Mohammad Teimouri, Muhammad Junaid, Abbas Khan, Houjin Zhang
Helicobacter pylori (H. pylori) is a human pathogen associated with acute gastritis and peptic ulcer. The MurA enzyme is an important drug target for the identification of ligands with improved efficacy and acceptable pharmaco-kinetic properties. We developed a homology model of H. Pylori MurA followed by refinement and molecular dynamics (MD) simulations. A total of 16 C60-derivatives were docked and its docking score were compared. Some of the known inhibitors were also similarly characterized and compared...
2017: Bioinformation
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