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Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]

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https://www.readbyqxmd.com/read/30426677/progress-on-the-photocatalytic-reduction-removal-of-chromium-contamination
#1
REVIEW
Zengying Zhao, He An, Jing Lin, Mingchao Feng, Vignesh Murugadoss, Tao Ding, Hu Liu, Qian Shao, Xianmin Mai, Ning Wang, Hongbo Gu, Subramania Angaiah, Zhanhu Guo
Rapid industrialization leads to increased wastewater discharge encompassing hexavalent chromium (Cr(VI)), which leads to serious environmental problems of toxicity and potential carcinogenicity. Removal of these species is normally carried out by ion-exchange, precipitation, membrane filtration, sorption, photocatalytic reduction, etc. This review mainly focuses on the photocatalytic and photoelectrocatalytic (PEC) reduction of Cr (VI), because of their advantages over other methods such as reduced risk of secondary pollution by non-reduced Cr (VI), no sludge formation, no need for a large amount of chemical reagents, clean and easy installation...
November 14, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30411498/the-o-directed-free-radical-hydrostannation-of-propargyloxy-dialkyl-acetylenes-with-ph-3-snh-cat-et-3-b-a-refutal-of-the-stannylvinyl-cation-mechanism
#2
REVIEW
Karl J Hale, Soraya Manaviazar, Hamish A Watson
In this Personal Account, we will give an overview of the room temperature O-directed free radical hydrostannation reaction of propargylically-oxygenated dialkyl acetylenes with Ph3 SnH and catalytic Et3 B/O2 in PhMe. We will show how this excellent reaction evolved, and how it has since been used to stereoselectively construct the complex trisubstituted olefin regions of three synthetically challenging natural product targets: (+)-pumiliotoxin B, (-)-(3R)-inthomycin C, and (+)-acutiphycin. Throughout this Account, we will pay special attention to highlighting important facets of the I-SnPh3 exchange processes that have so far been used in the various different steric settings that we have addressed, and we will document the range of cross coupling protocols that have critically underpinned the first successful applications of this method in complex natural product total synthesis...
November 8, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30387546/template-synthesized-vertical-needle-array-as-injection-platform-for-microalgae
#3
REVIEW
Hitomi Mukaibo
Increasing numbers of studies in the past few decades have demonstrated vertically-oriented nanoneedles arrays (NNAs) as innovative tools to interrogate and manipulate biological cells, where the needles are inserted into the cells as functional probes for high-throughput detection and biomolecule delivery. However, majority of these studies use mammalian cells: leaving NNA application to plant cells still in its infancy and largely unexplored. This paper highlights our contributions in exploring the utility of NNAs to microalgae - a diverse group of aquatic, photosynthetic organisms studied intensively as bio-factories for producing high-value-added products such as fuels and pharmaceuticals...
November 2, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30387544/surface-and-interface-chemistry-in-colloidal-quantum-dots-for-solar-applications-studied-by-x-ray-photoelectron-spectroscopy
#4
REVIEW
Pip C J Clark, Wendy R Flavell
Control of the surface and interface chemistry of colloidal quantum dots (CQDs) is critical to achieving a product with good air stability and high performing optoelectronic devices. Through various surface passivation treatments, vast improvements have been made in fields such as CQD photovoltaics; however devices have not currently reached commercial standards. We show how X-ray photoelectron spectroscopy (XPS) can provide a better understanding of exactly how surface treatments act on CQD surfaces, and the effect of surface composition on air stability and device performance...
November 2, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30378755/co-2-conversion-with-alcohols-and-amines-into-carbonates-ureas-and-carbamates-over-ceo-2-catalyst-in-the-presence-and-absence-of-2-cyanopyridine
#5
REVIEW
Keiichi Tomishige, Masazumi Tamura, Yoshinao Nakagawa
Recent progress on the CeO2 catalyzed synthesis of organic carbonates, ureas, and carbamates from CO2 +alcohols, CO2 +amines, and CO2 +alcohols+amines, respectively, is reviewed. The reactions of CO2 with alcohols and amines are reversible ones and the degree of the equilibrium limitation of the synthesis reactions is strongly dependent on the properties of alcohols and amines as the substrates. When the equilibrium limitation of the reaction is serious, the equilibrium conversion of the substrate and the yield of the target product is very low, therefore, the shift of the equilibrium reaction to the product side by the removal of H2 O is essential in order to get the target product in high yield...
October 31, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30378269/chemical-control-system-of-epigenetics
#6
REVIEW
Thangavel Vaijayanthi, Ganesh N Pandian, Hiroshi Sugiyama
Epigenetics represents the inheritable changes to the chemical control system governing the gene expression with no ensuing changes to the underlying DNA sequence. Environment-mediated modification of the natural epigenetic interactions can perturb the cellular homeostasis and drive cells to a diseased state by switching therapeutically essential genes ON and OFF. Contemporary bioinformatics tools have revealed the structural chemical modifications of the epigenetic enzymes associated with several complex diseases, including cancers, immune disorders, and neurodegenerative disorders at the fundamental level...
October 31, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30378253/electromagnetic-relationship-between-microwaves-and-flow-reactor-systems
#7
REVIEW
Jun-Ichi Sugiyama
One of the important points in handling microwaves is that the order of magnitude is decimeter order. Laboratory equipment is not too big for wavelength, so intensity nonuniformity may occur. Another important point is that microwave propagation changes with material parameter changes. To heat material in the planned shape, the consideration with electromagnetism about the equipment and the system will be necessary. Herein, the phenomena which should be considered when a flow reactor is irradiated with a microwave is described...
October 31, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30378257/polyanionic-compounds-for-potassium-ion-batteries
#8
REVIEW
Tomooki Hosaka, Tomoaki Shimamura, Kei Kubota, Shinichi Komaba
Lithium-ion batteries have the highest energy density among practical secondary batteries and are widely used for electronic devices, electric vehicles, and even stationary energy-storage systems. Along with the expansion of demand and applications, the concern about resources of lithium and cobalt is growing. Therefore, secondary batteries composed of abundant elements are required to complement lithium-ion batteries. In recent years, the development of potassium-ion batteries has attracted much attention, especially for large-scale energy storage...
October 30, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30375178/estimation-of-outlet-temperature-of-a-flow-reactor-heated-by-microwave-irradiation
#9
REVIEW
Kazuhiro Takeda, Nana Yanagi, Keisuke Nonaka, Nobuyuki Mase
Flow reactors heated by microwave irradiation attract attention. The reactors are suitable for difficult synthesis processes due to rapid heating and cooling, and easy pressurization. In order to predict the quality of the product, it is appropriate to estimate the outlet conditions of the reactor. In this paper, the outlet temperature of the flow direction is estimated by using the flow condition and dynamic thermal energy balance of the reactor.
October 30, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30375173/molecular-design-tactics-for-highly-efficient-thermally-activated-delayed-fluorescence-emitters-for-organic-light-emitting-diodes
#10
REVIEW
Rajendra Kumar Konidena, Jun Yeob Lee
Recently, pure organic thermally activated delayed fluorescence (TADF) emitters have attracted considerable interest from the scientific community in the field of organic light emitting diodes (OLEDs) as they can theoretically realize 100‚ÄČ% of the internal quantum efficiency by exploiting both the singlet and triplet excitons via the reverse intersystem crossing enabled by small singlet-triplet energy splitting. Currently, the external quantum efficiency of the TADF emitters is reaching the level of phosphorescent emitters...
October 30, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30375158/spatial-decomposition-analysis-of-electrical-conductivity
#11
REVIEW
Nobuyuki Matubayasi
Spatial decomposition is conducted for the electrical conductivity. The contribution per ion pair at a certain distance is identified in terms of a two-body velocity time correlation function and is integrated over the whole distance of the ion pair to provide the cross-correlation term of the conductivity. The spatial-decomposition formula is an exact expression at any concentrations of ions and incorporates physically appealing pictures in the space domain into the theory of time correlation functions. Illustrative analyses are presented for 1m NaCl aqueous solution and the [C4 mim][NTf2 ] ionic liquid...
October 30, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30375156/recent-advances-in-isoindigo-inspired-organic-semiconductors
#12
REVIEW
Nicholas M Randell, Timothy L Kelly
Over the past decade, isoindigo has become a widely used electron-deficient subunit in donor-acceptor organic semiconductors, and these isoindigo-based materials have been widely used in both organic photovoltaic (OPV) devices and organic field effect transistors (OFETs). Shortly after the development of isoindigo-based semiconductors, researchers began to modify the isoindigo structure in order to change the optoelectronic properties of the resulting materials. This led to the development of many new isoindigo-inspired compounds; since 2012, the Kelly Research Group has synthesized a number of these isoindigo analogues and produced a variety of new donor-acceptor semiconductors...
October 30, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30375154/operando-xafs-imaging-of-distribution-of-pt-cathode-catalysts-in-pefc-mea
#13
REVIEW
Hirosuke Matsui, Naoyuki Maejima, Nozomu Ishiguro, Yuanyuan Tan, Tomoya Uruga, Oki Sekizawa, Tomohiro Sakata, Mizuki Tada
Three-dimensional imaging using X-ray as a probe is state-of-the-art for the characterization of heterogeneous materials. In addition to simple imaging of sample morphology, imaging of elemental distribution and chemical states provides advanced maps of key structural parameters of functional materials. The combination of X-ray absorption fine structure (XAFS) spectroscopy and three-dimensional imaging such as computed tomography (CT) can visualize the three-dimensional distribution of target elements, their valence states, and local structures in a non-destructive manner...
October 30, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30375153/copper-catalyzed-c-h-activation
#14
REVIEW
M Lakshmi Kantam, Chandrakanth Gadipelly, Gunjan Deshmukh, K Rajender Reddy, Suresh Bhargava
Activation of C-H bonds and their application in cross coupling chemistry has received a wider interest in recent years. The conventional strategy in cross coupling reaction involves the pre-functionalization step of coupling reactants such as organic halides, pseudo-halides and organometallic reagents. The C-H activation facilitates a simple and straight forward approach devoid of pre-functionalization step. This approach also addresses the environmental and economical issues involved in several chemical reactions...
October 30, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30375148/peptide-nanomaterials-designed-from-natural-supramolecular-systems
#15
REVIEW
Hiroshi Inaba, Kazunori Matsuura
Natural supramolecular assemblies exhibit unique structural and functional properties that have been optimized over the course of evolution. Inspired by these natural systems, various bio-nanomaterials have been developed using peptides, proteins, and nucleic acids as components. Peptides are attractive building blocks because they enable the important domains of natural protein assemblies to be isolated and optimized while retaining the original structures and functions. Furthermore, the peptide subunits can be conjugated with exogenous molecules such as peptides, proteins, nucleic acids, and metal nanoparticles to generate advanced functions...
October 30, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30358095/crystalline-conjugated-polymers-for-organic-solar-cells-from-donor-acceptor-to-single-component
#16
REVIEW
Dongdong Xia, Cheng Li, Weiwei Li
Organic solar cells have made rapid progress in the last two decades due to the innovation of conjugated materials and photovoltaic devices. Microphase separation that connects with materials and devices plays a crucial role in the charge generation process. In this account, we summary our recent works of developing new crystalline conjugated polymers to control the microphase separation in thin films in order to realize high performance in solar cells, including crystalline diketopyrrolopyrrole-based donor polymers, perylene bisimide-based electron acceptors, and "double-cable" conjugated polymers that contain covalently-linked crystalline donor and acceptor in one material for single-component organic solar cells...
October 24, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30358067/high-performance-organic-electroluminescence-design-from-organic-light-emitting-materials-to-devices
#17
REVIEW
Peng Tao, Yanqin Miao, Hua Wang, Bingshe Xu, Qiang Zhao
Organic electroluminescence is considered as the most competitive alternative for the future solid-state displays and lighting techniques owing to many advantages such as self-luminescence, high efficiency, high contrast, high color rendering index, ultra-thin thickness, transparency, flat and flexibility, etc. The development of high-performance organic electroluminescence has become the continuing focus of research. In this personal account, a brief overview of representative achievements in our study on the design of highly efficient novel organic light-emitting materials (including fluorescent materials, phosphorescent iridium(III) complexes and conjugated polymers bearing phosphorescent iridium(III) complex) and high-performance device structures together with working principles are given...
October 24, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30338915/key-factors-for-simultaneous-improvements-of-performance-and-durability-of-core-shell-pt-3-ni-carbon-electrocatalysts-toward-superior-polymer-electrolyte-fuel-cell
#18
REVIEW
Xiao Zhao, Shinobu Takao, Takuma Kaneko, Yasuhiro Iwasawa
It remains a big challenge to remarkably improve both oxygen reduction reaction (ORR) activity and long-term durability of Pt-M bimetal electrocatalysts simultaneously in the harsh cathode environment toward widespread commercialization of polymer electrolyte fuel cells (PEFC). In this account we found double-promotional effects of carbon micro coil (CMC) support on ORR performance and durability of octahedral Pt3 Ni nanoparticles (Oh Pt3 Ni/CMC). The Oh Pt3 Ni/CMC displayed remarkable improvements of mass activity (MA; 13...
October 19, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30338896/six-years-2012-2018-of-researches-on-catalytic-ezh2-inhibitors-the-boom-of-the-2-pyridone-compounds
#19
REVIEW
Rossella Fioravanti, Giulia Stazi, Clemens Zwergel, Sergio Valente, Antonello Mai
Enhancer of zeste homolog 2 (EZH2), the catalytic subunit of the Polycomb repressive complex 2 (PRC2), catalyzes the methylation of lysine 27 of histone H3 (H3K27) up to its trimethylated form (H3K27me), inducing by this way block of transcription and gene silencing. High levels of H3K27me3 have been found in both hematological malignancies and solid cancers, due to EZH2 overexpression and/or EZH2 mutation. From 2012, a number of highly potent and selective catalytic inhibitors of EZH2 have been reported, almost all bearing a 2-pyridone group in their structure...
October 19, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
https://www.readbyqxmd.com/read/30335224/what-news-in-the-surface-chemistry-of-bulk-and-supported-vanadia-based-scr-catalysts-improvements-in-their-resistance-to-poisoning-and-thermal-sintering
#20
REVIEW
Pascal Granger, Hermann W Siaka, Shubhangi B Umbarkar
This paper reports a short review on the impact of poisoning effects and thermal aging on the reactivity of surface vanadate species on benchmark V2 O5 -WO3 /TiO2 Selective-Catalytic-Reduction catalysts. A renewed interest of this SCR technology is related to its diversification notably as after-treatment systems to treat the exhaust from Diesel engines with higher running temperature especially when SCR catalysts are coated on Diesel Particulates Filters. Particular attention is also paid to poisoning effects in conjunction with the progressive replacement of fossil fuels by bio-fuels containing alkaline contaminants which drastically deactivate the catalyst through neutralization of strong acid sites...
October 18, 2018: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
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