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Chemistry, An Asian Journal

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https://www.readbyqxmd.com/read/29144606/mesoporous-nickel-and-cobalt-based-oxides-nanorods-catalytic-effects-on-improving-libh4-dehydrogenation-properties
#1
Lei Zang, Qiuyu Zhang, Li Li, Yike Huang, Xiaoya Chang, Lifang Jiao, Huatang Yuan, Yijing Wang
Lithium borohydride (LiBH4) with a theoretical hydrogen storage capacity of 18.5 wt% has attracted intense interest as a high-density hydrogen storage material. However, high dehydrogenation temperatures and limited kinetics restrict its practical applications. In this study, the mesoporous nickel- and cobalt-based oxides nanorods (NiCo2O4, Co3O4 and NiO) were controlled synthesized by hydrothermal method and mixed with LiBH4 by ball milling. It is found that the dehydrogenation properties of LiBH4 are remarkably enhanced by doping the as-synthesized metal oxides nanorods...
November 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29143473/recent-advancements-of-rylene-imide-dyes-synthesis-and-application-as-organic-semiconducting-materials
#2
Jiajing Feng, Wei Jiang, Zhaohui Wang
Rylene imide dyes have been among the most promising organic semiconducting materials for several years due to their remarkable optoelectronic properties and high chemical/thermal persistency. In the past decades, various spendid rylene imide dyes have been developed for optoelectronic devices, such as organic solar cells (OSCs) and organic field-effect transistors (OFETs). Recently, tremendous progress of perylene diimides (PDIs) and the analogues used in OSCs has been witnessed attributed to their ease of functionalization...
November 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29140603/protic-nnn-and-ncn-pincer-type-ruthenium-complexes-featuring-trifluoromethyl-pyrazole-arms-synthesis-and-application-to-catalytic-hydrogen-evolution-from-formic-acid
#3
Yoshiko Nakahara, Tatsuro Toda, Asuka Matsunami, Yoshihito Kayaki, Shigeki Kuwata
The NNN and NCN pincer-type ruthenium(II) complexes featuring two protic pyrazol-3-yl arms with a trifluoromethyl (CF3) group at the 5-position were synthesized and structurally characterized to evaluate the impact of the substitution on the properties and catalysis. The Brønsted acidity increased by the highly electron-withdrawing CF3 pendants was demonstrated by the protonation-deprotonation experiments. By contrast, the infrared spectra of the carbonyl derivatives as well as the cyclic voltammogram indicated that the electron density of the ruthenium atom is little influenced by the CF3 group...
November 15, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29139212/shape-controlled-surface-coating-to-pd-mesoporous-silica-core-shell-nanocatalysts-with-high-catalytic-activity-and-stability
#4
Jie Ying, Christoph Janiak, Yu-Xuan Xiao, Hao Wei, Xiao-Yu Yang, Bao-Lian Su
Cubic Pd nanocrystals with shape-controlled mesoporous silica shells have been theoretically designed and successfully synthesized for investigating the effect of a porous nanoshell on catalytic performance of the core. Cubic Pd@cubic mesoporous silica keeps activity of all facets and shows highest catalytic activity and enhanced reusability in the hydrogenation of nitrobenzene.
November 14, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29139206/periodically-arranged-arrays-of-dendritic-pt-nanospheres-using-cage-type-mesoporous-silica-as-a-hard-template
#5
Kenya Kani, Victor Malgras, Bo Jiang, Md Shahriar A Hossain, Saad M Alshehri, Tansir Ahamad, Rahul R Salunkhe, Zhenguo Huang, Yusuke Yamauchi
Dendritic Pt nanospheres of 20 nm diameter are synthesized by using highly concentrated surfactant assembly within the large-sized cage-type mesopores of mesoporous silica (LP-FDU-12). After diluting the surfactant solution with ethanol, the lower viscosity lead to an improved penetration inside the mesopores. After Pt deposition followed by template removal, the arrangement of the Pt nanospheres is a replication from that of the mesopores in the original LP-FDU-12 template. Although it is well known that ordered LLCs can form on flat substrates, confined space inside the mesopores hinders surfactant self-organization...
November 14, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29120080/visible-light-photoactive-highly-efficient-triplet-sensitizers-based-on-iodinated-aza-bodipys-synthesis-photophysics-and-redox-properties
#6
Łukasz Łapok, Arkadiusz Gut, Dawid Drelinkiewicz, Tomasz Pędziński, Bronisław Marciniak, Maria Nowakowska
A series of novel iodinated NO2-substituted aza-BODIPYs have been synthesized and characterized. Highly desirable photophysical and photochemical properties were induced in NO2-substituted aza-BODIPYs by iodination of the pyrrole rings. In particular, high values of singlet oxygen quantum yields (ΦΔ) ranging from 0.79 to 0.85 were measured. The photooxygenation process proceeds via Type II mechanism under the experimental conditions applied. The compounds studied exhibited an absorption band within the so-called "therapeutic window", with λmax located between 645 nm to 672 nm...
November 9, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29105311/metal-catalyzed-c-h-bond-functionalization-of-5-membered-carbocyclic-rings-a-powerful-access-to-azulenes-acenaphthylenes-and-fulvenes-derivatives
#7
Xinzhe Shi, Arpan Sasmal, Jean-Francois Soulé, Henri Doucet
Azulenes, acenaphthylenes and fulvenes derivatives exhibit important physical properties useful in material chemistry and also biological properties. Since a two decades, the metal-catalyzed functionalization of such compounds, via the C-H bond activation of their 5-membered carbocyclic ring, proved to be a very convenient method for the synthesis of a wide variety of azulene, acenaphthylene and fulvene derivatives. For such reactions, there is no need to prefunctionalize the 5-membered carbocyclic rings. In this review, the progress in the synthesis of azulene, acenaphthylene and fulvene derivatives via the metal-catalyzed C-H bond activation of their 5-membered carbocyclic ring are summarized...
November 3, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29098772/crystal-and-nmr-structures-of-a-peptidomimetic-%C3%AE-turn-which-provides-facile-synthesis-of-13-membered-cyclic-tetrapeptides
#8
Alan James Cameron, Christopher J Squire, Patrick J B Edwards, Elena Harjes, Vijayalekshmi Sarojini
Herein we report the unique conformations adopted by linear and cyclic tetrapeptides (CTPs) containing 2-aminobenzoic acid (2-Abz) in solution and as single crystals. The crystal structure of the linear tetrapeptide H2N-D-Leu-D-Phe-2-Abz-D-Ala-COOH (1) reveals a novel planar peptidomimetic β-turn stabilized by three hydrogen bonds and is in agreement with its NMR structure in solution. While CTPs are often synthetically inaccessible or cyclize in poor yield, both 1 and its N-Me-D-Phe analogue (2) adopt pseudo-cyclic frameworks enabling near quantitative conversion to the corresponding CTPs 3 and 4...
November 2, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29094805/synthesis-of-naphthyridine-dimers-with-conformational-restriction-and-binding-to-dna-and-rna
#9
Kazuhiko Nakatani, Nozomi Natsuhara, Yuki Mori, Sanjukta Mukherjee, Bimolendu Das, Asako Murata
One of the important determinants in the efficiency of a molecular interaction is the necessity for conformational changes in host and/or guest molecules upon binding. In small-molecule interactions with nucleic acids, conformational changes on both molecules are often involved, especially in intercalating binding. Mismatch binding ligands (MBLs) we described here consist of two heterocycles that predominantly exist in one conformation, so it is of interest to determine if such molecules can bind to any DNA and RNA structures...
November 2, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29090516/3d-porous-carbon-frameworks-stabilized-ultra-uniform-nano-%C3%AE-fe2o3-an-exquisite-catalyst-system
#10
Qionglin Liang, Yongjian Ai, Mengqi He, Qianrui Lv, Lei Liu, Hongbin Sun, Mingyu Ding
We present a novel strategy for the scalable fabrication of γ-Fe2O3@3DPCF, a three dimensional porous carbon frameworks anchored ultra uniform and ultra stable nano γ-Fe2O3. The γ-Fe2O3@3DPCF nanocomposites were facilely prepared with the following route: a condensation of iron (III) acetylacetonate with acetoacetone at room temperature formed the polymer precursor (PPr), which was carbonized subsequently at 800 oC. The homogeneous aldol condensation offered an ultra uniform distribution of the iron, so that the γ-Fe2O3 nanoparticles (NPs) were uniformly distributed in the 3D carbon architecture with the average size of approximate 20 nm...
November 1, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29087031/quantitative-analysis-of-self-assembly-process-of-a-pd12l24-coordination-sphere
#11
Shumpei Kai, Taro Shigeta, Tatsuo Kojima, Shuichi Hiraoka
The self-assembly process of a Pd12L24 sphere was revealed by a quantitative approach (quantitative analysis of self-assembly process: QASAP) quantifying all the substrates, the products, and the observable intermediates, indicating that the Pd12L24 sphere is produced through several pathways. Firstly, PdnL2n (n = 6, 8, and 9), which are perfectly closed structures smaller than the Pd12L24 sphere, and a mixture of intermediates not observed by NMR (Int) were produced. Next, the sphere was assembled from intra-/intermolecular reaction of a certain class of Int (path A) and from the coordination of free pyridyl groups in Int to the Pd(II) center of PdnL2n (n = 6, 8, and 9) (path B)...
October 31, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29086497/benziodoxole-triflate-as-a-versatile-reagent-for-iodo-iii-cyclization-of-alkynes
#12
Bin Wu, Junliang Wu, Naohiko Yoshikai
We report herein on the utility of benziodoxole triflate, derived from α,α-bis(trifluoromethyl)-2-iodobenzyl alcohol, as a versatile reagent for iodo(III)cyclization via electrophilic activation of alkyne. The reagent promotes cyclization of alkynes tethered to a variety of nucleophilic moieties, affording benziodoxole-appended (hetero)arenes such as benzofurans, benzothiophenes, isocoumarins, indoles, and polyaromatics under mild conditions. This unprecedented class of (hetero)aryl-IIII compounds proved easy to purify, stable, and amenable to various synthetic transformations...
October 30, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29083098/click-chemistry-derived-pyridazines-electron-deficient-building-blocks-with-defined-conformation-and-packing-structure
#13
Irén Birkenfelder, Johannes Gurke, Lutz Grubert, Stefan Hecht, Bernd M Schmidt
A series of 3,6-bis(4-triazolyl)pyridazines equipped with terminal phenyl substituents with varying degree of fluorination were synthesized by the facile copper-catalyzed azide-alkyne cycloaddition and their structures were thoroughly investigated in the gas phase, in solution, and in the solid state by employing DFT calculations, NMR spectroscopy, and single-crystal X-ray diffraction, respectively. On the molecular level, their structure is governed by the strong preference of the triazole-pyridazine linkages for the anti-conformation...
October 30, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29071808/controllable-activation-of-pd-g3-palladacycle-precatalyst-in-the-presence-of-thiosugars-rapid-access-to-1-aminobiphenyl-thioglycoside-atropoisomers-at-room-temperature
#14
Samir Messaoudi, Riyadh Ahmed Atto Al-Shuaeeb, Mouad Alami, Camille Dejean
A controllable method for the functionalization of XantPhos Pd-G3 precatalyst with thiosugars and thiols has been established. Under mild and operationally simple reaction conditions through just mixing of precatalyst and thiosugars (α- or β-mono-, di- and poly-thiosugar derivatives) in water at 25 °C for 20 min, a series of 1-aminobiphenyl thioglycosides that are difficult to synthesize by classical methods, has been synthesized in very high yields.
October 26, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29068149/one-step-preparation-of-carbon-based-solid-acid-catalyst-from-water-hyacinth-leaves-for-esterification-of-oleic-acid-and-dehydration-of-xylose
#15
Jutitorn Laohapornchaiphan, Christopher B Smith, Siwaporn Meejoo Smith
Carbon-based solid acid catalysts were successfully obtained via one-step hydrothermal carbonization (HTC) of water hyacinth (WH) in the presence of p-toluenesulfonic acid (PTSA). Increasing the HTC temperature from 180 to 240 °C resulted in carbonaceous materials with increased sulfur content and less adsorbed water. The material obtained at 220 °C (WH-PTSA-220) contains the highest amount of acid sites and promotes the highest initial rate of two transformations, that is, methanolysis of oleic acid and dehydration of xylose to furfural...
October 25, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29063717/chemical-fixation-of-co2-and-other-heterogeneous-catalytic-studies-employing-a-layered-cu-porphyrin-prepared-through-single-crystal-to-single-crystal-exchange-of-a-zn-analogue
#16
Srinivasan Natarajan, Gargi Dutta, Ajay Kumar Jana
A solvothermal reaction of Zn(NO3)2.6H2O, tetra-(4-pyridyl)porphyrin (H2TPyP) and 4,4'-Oxybis(benzoic acid) (H2OBA) resulted in a new two-dimensional Zn-porphyrin MOF compound, [Zn2(C40H24N8)0.5(C14H8O5)(DMA)](DMA)(H2O)6, 1. The Zn(II) ions present in 1 could be ion-exchanged employing Cu(NO3)2.3H2O solution at room temperature resulting in [Cu2(C40H24N8)0.5(C14H8O5)(DMA)](DMA)(H2O)3, (Cu∊1) compound. The extra-framework solvent molecules have been shown to be reversibly removed/exchanged without the collapse of the framework...
October 24, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29063729/the-dual-mechanism-ict-fret-based-fluorescent-probe-for-the-selective-detection-of-hydrogen-peroxide
#17
Xiao Liang, Xiaoyi Xu, Dan Qiao, Zheng Yin, Luqing Shang
We designed and synthesized the dual mechanism ICT-FRET fluorescent probe for the selective detection of H2O2 in living cells. This probe used a coumarin-naphthalimide hybrid as the FRET platform and a boronate moiety as the recognition group. Upon addition of H2O2, the probe exhibited a redshifted (73 nm) fluorescence emission, and the ratio of fluorescence intensities at 558 and 485 nm (F558 / F485) shifted notably (up to 100-fold). Moreover, there was a good linearity (R2 = 0.9911) between the ratio and the concentration of H2O2 in the range of 0 to 60 µM, with a limit of detection of 0...
October 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29058778/conversion-of-triple-bonds-to-single-bonds-in-a-domino-carbopalladation-with-norbornene
#18
Huanfeng Jiang, Chuanle Zhu, Pengquan Chen, Rui Zhu, Guangbin Jiang, Zhiming Lin, Wanqing Wu
A domino carbopalladation reaction of haloalkynes is presented. Remarkably, the four-time carbopalladation process converts the carbon-carbon triple bonds of haloalkynes stepwise into carbon-carbon double bonds, and finally to carbon-carbon single bonds. This reaction features that the carbon-carbon double bonds of stable vinyl palladium intermediates are transformed to carbon-carbon single bonds with the generation of unstable alkyl palladium intermediates. The subsequently formed π-allylpalladium species are independently trapped by N-tosylhydrazones, boronic acids, and B2pin2 in a highly diastereoselective manner, delivering the corresponding polycyclic and twisted products with a bicyclo[3...
October 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29057626/iriii-based-octahedral-metalloligands-derived-primitive-cubic-frameworks-for-enhanced-co2-n2-separation
#19
Sheng-Li Huang, Naifang Liu, Yun Ling, He-Kuan Luo
We developed a metalloligand strategy to construct porous frameworks, viz. the combined use of IrIII-based octahedral metalloligands and linear unit [Ni(cyclam)] easily afforded two isostructural complexes 1 and 2 with primitive cubic frameworks. Both two complexes show good CO2/N2 separation property.
October 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/29052371/recyclable-and-intrinsically-anti-cyanobacterial-polyanionic-membranes
#20
Zhe Sun, Xin Liu, Jiangna Guo, Dan Xu, Songdong Shen, Feng Yan
Cyanobacteria blooms possess serious threats to water resources. Herein, we report the synthesis of polyanionic membranes (PA-M) by in situ photo-crosslinking of a sulfate-based anionic monomer followed by cation-exchange with metal cations, Fe(3+) (PA-Fe), Cu(2+) (PA-Cu), or Zn(2+) (PA-Zn). The effect of cations on the anti-cyanobacterial activities against both Microcystis aeruginosa (M. aeruginosa) and Anabaena flos-aquae (A. flos-aquae) was investigated. All the prepared metal-containing membranes (PA-Fe, PA-Cu, PA-Zn) exhibit high anti-cyanobacterial activities and long-term anti-cyanobacterial stability, demonstrating that the synthesized PA-M membranes can be used as an effective and safe inhibitor to control cyanobacterial blooms...
October 20, 2017: Chemistry, An Asian Journal
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