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Chemistry, An Asian Journal

Yasuko Osakada, Tuyoshi Fukaminato, Yuma Ichinose, Mamoru Fujitsuka, Yoshie Harada, Tetsuro Majima
Fluorescence photoswitching using nanomaterials has recently emerged as a promising approach for the imaging of biological targets. However, despite intensive research efforts during the last decade, practical microscopy of biological targets using photoswitchable nanoparticles in real time remains challenging. To address this problem, we have developed live macrophage cell imaging and single particle imaging methods, using photoswitchable fluorescent diarylethene-doped polymer nanoparticles (P-dots) under Xe lamp irradiation...
August 15, 2017: Chemistry, An Asian Journal
Da-Hui Qu, Qi Zhang, Tian-Yi Xu, Cai-Xin Zhao, Wei-Hang Jin, Qian Wang
The design of tunable dynamic self-assembly of nanoparticles with switchable assembled dimensions and morphologies is a challenging goal whose realization is vital for the evolution of smart nanomaterials. Herein we show the chitosan polymer as an effective supramolecular "glue" for aldehyde-modified Au nanoparticles to reversibly modulate the states of self-assembled nanocomposites. By simultaneous integration of dynamic covalent Schiff base interactions and noncovalent hydrogen bonds, the chitosan/Au nanocomposites could reversibly transform their assembled morphologies from one-dimensional nanowires to three-dimensional nanosponges in response to the variation of pH value...
August 15, 2017: Chemistry, An Asian Journal
Hong Wang, Yi Hu, Shivaraj Yellappa, Michael B Thomas, R G Waruna Jinadasa, Alex Matus, Max Shulman, Francis D'souza
A novel class of β-functionalized push-pull zinc opp-dibenzoporphyrins were designed, synthesized and utilized as sensitizers for dye-sensitized solar cells. Spectral, electrochemical and computational studies were systematically performed to evaluate their spectral coverage, redox behavior and electronic structures. These porphyrins displayed much broader spectral coverage and more facile oxidation upon extension of π-conjugation. Free-energy calculations and femtosecond transient absorption studies (charge injection rate in the range of 1011 s-1) suggest efficient charge injection from the excited singlet state of porphyrin to the conduction band of the TiO2...
August 11, 2017: Chemistry, An Asian Journal
Kaijian Zhu, Wenjun Luo, Guoxiang Zhu, Jun Wang, Yongfa Zhu, Zhigang Zou, Wei Huang
Fe-based (oxy)hydroxides are especially attractive electrocatalysts for oxygen evolution reaction (OER) due to their earth-abundance, low cost and non-toxicity. However, poor OER kinetics on the surface restricts the performance of FeOOH electrocatalyst. In this work, we obtain a highly efficient and stable Ni(OH)2/β-like FeOOH electrocatalyst by facile electro-activation treatment. The activated Ni(OH)2/β-like FeOOH sample indicates an overpotential of 300 mV @ 10 mA cm-2 for OER and no obvious current decay after 50 h test, which can be comparable to the most efficient Ni-based and Co-based electrocatalysts on the planar substrates...
August 9, 2017: Chemistry, An Asian Journal
Qingdao Zeng, Hongliang Dai, Shuai Wang, Ichiro Hisaki, Shoichi Nakagawa, Nobuaki Ikenaka, Ke Deng, Xunwen Xiao
In this contribution, we have investigated the on-surface self-assembled behaviors of four C3-symmetric π-conjugated planar molecules (Tp, T12, T18, and Ex). These molecules have been proven to be excellent building blocks for constructing non-covalent organic frameworks in bulk phase. Their hydrogen-bonded two-dimensional (2D) on-surface self-assemblies are observed under STM investigation at solid/liquid interface, which are of much difference with those in bulk crystal. Upon the combination of STM technique and density functional theory (DFT) calculation, we reveal the formation mechanism of different assemblies, especially, the critical role of the hydrogen bonding in the assemblies...
August 8, 2017: Chemistry, An Asian Journal
Kelli M Rutledge, Trevor Hamlin, Donna Baldisseri, Matthias Bickelhaupt, Mark Wayne Peczuh
The shapes adopted by large-ring, macrocyclic compounds play a role in their reactivity and their ability to be bound by biomolecules. We investigate the synthesis, conformational analysis, and properties of a specific family [13]-macrodilactones as models of natural product macrocycles. The features of our macrodilactones enable us to study the relationship between stereogenic centers and planar chirality through the modular synthesis of new members of this family of macrocycles. Here we report on insights gained from a new [13]-macrodilactone that is substituted at a position adjacent to the alkene in the molecule...
August 7, 2017: Chemistry, An Asian Journal
Leonid Romashov, Valentine P Ananikov
Acetylene-functionalized platform chemicals were synthesized for the first time based on biomass-derived 5-hydrohymethylfurfural (HMF). Demanded mono- and bis-ethynylfurans were obtained in high yields (89-99%). Plausible application of these products in the synthesis of smart organic conjugated materials and pharmaceuticals was addressed in a series of transformations. Conjugated polyacetylenic polymers with morphology control have been prepared with the incorporation of the HMF core.
August 7, 2017: Chemistry, An Asian Journal
Ankita Saini, K R Justin Thomas, Abhay Sachdev, Packrisamy Gopinath
A series of 1,8-naphthalimide-based fluorophores containing different chromophores with varying conjugation and electron richness at imidic nitrogen are synthesized and characterized. These amine-functionalized naphthalimides are bipolar in nature and exhibit interesting optical and morphological variations attributable to the nature of N-substituents. Despite the dyes are structurally different due to the substituent variation in the imidic nitrogen, their electronic characteristics are similar originating from the 4-aminonaphthalimide segment...
August 7, 2017: Chemistry, An Asian Journal
Lilu Zhang, Eric Meggers
Chirality is an essential feature of asymmetric catalysts. This review summarizes asymmetric catalysts that derive their chirality exclusively from stereogenic metal centers. Reported chiral-at-metal catalysts can be divided into two classes, namely, inert metal complexes, in which the metal fulfills a purely structural role, so catalysis is mediated entirely through the ligand sphere, and reactive metal complexes. The latter are particularly appealing because structural simplicity (only achiral ligands) is combined with the prospect of particularly effective asymmetric induction (direct contact of the substrate with the chiral metal center)...
August 7, 2017: Chemistry, An Asian Journal
Zakaria Boughlala, Celia Fonseca Guerra, F Matthias Bickelhaupt
We have carried out an extensive exploration of gas-phase Alkali Metal Cation Affinities (AMCA) of archetypal anionic bases across the periodic system using relativistic density functional theory at ZORA-BP86/QZ4P//ZORA-BP86/TZ2P. AMCA values of all bases were computed for the lithium, sodium, potassium, rubidium and cesium cations and compared with the corresponding proton affinities (PA). One purpose of this work is to provide an intrinsically consistent set of values of the 298 K AMCAs of all anionic (XHn-1-) constituted by maingroup-element hydrides of groups 14-17 along the periods 2-6...
August 5, 2017: Chemistry, An Asian Journal
Shizuma Tanaka, Kenta Wakabayashi, Kazuki Fukushima, Shinsuke Yukami, Ryuki Maezawa, Yuhei Takeda, Kohei Tatsumi, Yuichi Ohya, Akinori Kuzuya
A new class of hydrogels utilizing DNA (DNA quadruplex gel) has been constructed by directly and symmetrically coupling deoxynucleotide phosphoramidite monomers to the ends of polyethylene glycols (PEGs) in liquid phase, and using the resulting DNA-PEG-DNA triblock copolymers as macromonomers. Elongation of merely four deoxyguanosine residues on PEG, which produces typically ~10 grams of desired DNA-PEG conjugates in one synthesis, realized intelligent and biodegradable hydrogels utilizing DNA quadruplex formation, responsive to various input signals such as Na+, K+, and complementary DNA strand...
August 4, 2017: Chemistry, An Asian Journal
Giridhar Pulletikurthi, Bernd Weidenfeller, Andriy Borodin, Jan C Namyslo, Frank Endres
Electrostatic interactions are characteristic for ionic liquids, they play a pivotal role in determining the formation of species when solutes are dissolved in them. The formation of new species/complexes has been investigated for certain ILs. However, such investigations have not yet been focused on eutectic liquids, which get emerging interest as a promising class of ILs. These liquids (or Liquid Coordination Complexes, LCCs) are rather new and are composed of cationic and anionic chloro complexes of metals...
August 4, 2017: Chemistry, An Asian Journal
Juan Tang, Yanfei Zhang, Hao-Yan Yin, Guoheng Xu, Jun-Long Zhang
Designing two-photon probes for precise labelling lipid droplet (LD) and monitoring LD dynamics in adipocytes is of great significance to understand LD homeostasis. We herein report that a luminescent metal complex LD-TPZn can specifically image LDs in adipose cells and tissue using one- or two-photon fluorescence microscopy. Importantly, LD-TPZn exhibited higher specificity to LD than commercial Nile Red and Bodipy 493/503, probably due to different cellular uptake pathways, clathrin-mediated endocytosis and non-selectively passive diffusion, respectively...
August 4, 2017: Chemistry, An Asian Journal
JeongSoo Hong, Nobuhiro Matsushita, Takashi Shirai, Kazuya Nakata, Chiaki Terashima, Akira Fujishima, Ken-Ichi Katsumata
In this study, we fabricated the solution-processed ZnO films having various structures, and investigated the influence of surface morphology and conductivity on photocatalytic performance including improvement of conductivity, hydrogen production, and photo-degradation of rhodamine B. Surface morphology was controlled by solution conditions, and as-fabricated films had rod, dense, and flower-like structure. We revealed the improvement of conductivity by photocatalytic activity of ZnO, influence of surface morphology on photo-degradation of rhodamine B, and relationship with conductivity and hydrogen production...
August 3, 2017: Chemistry, An Asian Journal
Kohei Fuchibe, Hisanori Imaoka, Junji Ichikawa
Fluoroarenes bearing no electron-withdrawing groups (non-activated fluoroarenes) readily underwent nucleophilic aromatic substitution with α-cyanocarbanions under microwave irradiation. The sequence (i) formylalkylation involving the cyanoalkylation of fluoroarenes, (ii) difluorovinylidenation, and (iii) Friedel-Crafts-type cyclization, afforded extended fluoroarenes by one benzene ring per cycle. Furthermore, the performance of multiple cycles successfully provided higher-order pinpoint-fluorinated polycyclic aromatic hydrocarbons (F-PAHs)...
August 2, 2017: Chemistry, An Asian Journal
Yasunori Minami, Migumi Sakai, Takumi Sakamaki, Tamejiro Hiyama
We found an intramolecular exo-hydroarylation of 2-aryloxy-1,4-disilylbut-1-en-3-ynes via ortho-C-H bond activation under palladium(0) and acid catalysis to give 2,3-bis(silylmethylidene)-2,3-dihydrobenzofurans. The two silyl groups probably promote the reaction and play a key role in stabilizing the diene moiety in the product. The products are readily led to functionalized condensed cycles by the Diels-Alder reaction.
August 2, 2017: Chemistry, An Asian Journal
Abdul Majeed Seayad, Tuan Thanh Dang
Efficient Cu-NHC catalyzed syntheses of pyrroles via two and three-component coupling methods are described, for the first time. Various 1,2-, 1,2,3-, 1,2,3,5- and fully substituted pyrroles were readily accessible through suitable choice of ketone, primary amine and diol in a three-component reaction. The N-unsubstituted pyrrole formation is also feasible through a two-component reaction involving a β-amino alcohol and a ketone.
August 1, 2017: Chemistry, An Asian Journal
Fangchun Han, Xiuling Jiao, Dairong Chen, Cheng Li
This work demonstrates a facile in situ synthesis of cobalt-manganese mixed sulfide (CoMn-S) nanocages on reduced graphene oxide (RGO) sheets by using a crystalline Co-Mn precursor as the sacrificial template. The CoMn-S/RGO hybrid was applied as the anode for Li-ion storage and exhibited superior specific capacity, excellent cycling performance, and great rate capability. In particular, lithium storage testing revealed that the hybrid delivered high discharge-charge capacities of 670 mA h g(-1) at 1...
August 1, 2017: Chemistry, An Asian Journal
Liqiang Wang, Xingxing Jiang, Min Zhang, Minghui Yang, You-Nian Liu
We report a new approach of in situ assembling gold nanoclusters (AuCNs) into hydrogel networks by exploiting the triple roles of protein as a gelator, a reducing agent as well as a template. The strategy simply involves the mixing of BSA and AuCl4- under alkaline condition. The obtained AuCNs-protein nanocomposite hydrogels with injectable and moldable features can be made into semi-transparent films or N-doped C/Au composites. Our work demonstrates the feasibility of fabricating AuCNs in situ embedded hybrid hydrogels, which can work as multifunctional precursors for constructing diverse nanocomposite materials...
July 31, 2017: Chemistry, An Asian Journal
Sunil P Lonkar, Vishnu V Pillai, Saeed Alhassan
A 3D highly interconnected macroporous network of reduced GO having finely dispersed few-layered 2D MoS2 nanosheets was constructed through direct use of acidic graphite oxide (GO) for the first time. This facile and technological scalable process can afford an efficient electrocatalysts, anode materials, HDS catalysts at lower cost and can circumvent the poor thermal stability and recyclability of the material. The strategy provided here can be the basis to design and develop practical processes to address the ultimate goal of large-scale manufacturing of hybrids composed of 2D materials for various energy and catalysis applications...
July 30, 2017: Chemistry, An Asian Journal
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