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Chemistry, An Asian Journal

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https://www.readbyqxmd.com/read/28337859/self-healable-suparmolecular-hydrogel-formed-by-nor-seco-cucurbit-10-uril-as-a-supramolecular-crosslinker
#1
Kyeng Min Park, Joon Ho Roh, Gihyun Sung, James Murray, Kimoon Kim
A supramolecular hydrogel was formed by a simple mixing of solutions of nor-seco-cucurbit[10]uril (NS-CB[10]) and adamantylamine terminated-4 armed polyethyleneglyol (AdA-4-arm-PEG). In the formation of the hydrogel, NS-CB[10] acted as a noncovalent crosslinker to form a ternary complex with two AdA moieties. The dynamic and selective nature of the host-guest interaction between NS-CB[10] and AdA enabled the supramolecular hydrogel to rapidly recover its physical properties after it was damaged. In addition, the recovered hydrogel showed sustained physical properties with negligible differences from those of the pristine material, even after multiple self-healing cycles...
March 24, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28334514/simple-and-versatile-preparation-of-luminescent-amphiphilic-platinum-ii-containing-polystyrene-complexes-with-transformable-nanostructures-assisted-by-pt%C3%A2-%C3%A2-%C3%A2-pt-and-%C3%AF-%C3%AF-interactions
#2
Heung-Kiu Cheng, Clive Yik-Sham Chung, Kaka Zhang, Vivian Wing-Wah Yam
Platinum(II)-containing polystyrene (PS) complexes have been synthesized by dehydrohalogenation of α-alkyne-PS and chloroplatinum(II) precursors with different functionalities on the terpyridine ligands. Through modulation of the hydrophilicity/hydrophobicity of the terpyridine ligands and hence the overall amphiphilicity of the complexes, the complexes can undergo self-assembly into various superstructures with remarkable luminescence properties in different solution mixtures, as revealed by electron microscopy, UV/Vis absorption and emission spectroscopy...
March 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28332343/bifunctional-cage-type-cubic-mesoporous-silica-sba-1-nanoparticles-for-selective-adsorption-of-dyes
#3
Chien-Hua Lin, Juti Rani Deka, Cheng-En Wu, Cheng-Hsun Tsai, Diganta Saikia, Yung-Chin Yang, Hsien-Ming Kao
Bifunctional SBA-1 mesoporous silica nanoparticles (MSNs) with carboxylic acid and amino groups (denoted as CNS-10-10) are successfully synthesized, characterized and employed as adsorbents for dye removal. The adsorbent CNS-10-10 shows high affinity towards cationic and anionic dyes in a wide pH range, and exhibits selective dye removal of a two dye mixture system of cationic methylene blue and anionic eosin Y. By changing the medium pH, the selectivity of adsorption behavior can be easily modulated. For comparison purposes, the counterparts, i...
March 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28332317/photoelectrochemical-hydrogen-peroxide-production-from-water-on-a-wo3-bivo4-photoanode-and-from-o2-on-an-au-cathode-without-external-bias
#4
Kojiro Fuku, Yuta Miyase, Yugo Miseki, Takashi Funaki, Takahiro Gunji, Kazuhiro Sayama
The photoelectrochemical production and degradation properties of hydrogen peroxide (H2O2) were investigated on a WO3/BiVO4 photoanode in an aqueous electrolyte of hydrogen carbonate (HCO3-). Highly-concentration of HCO3- species rather than CO32- species inhibited the oxidative degradation of H2O2 on the WO3/BiVO4 photoanode, resulting in achieving effectively oxidative H2O2 generation and accumulation from water (H2O). Moreover, the Au cathode facilitated two-electron reduction of O2, resulting in reductive H2O2 production with high current efficiency...
March 23, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28329418/covalent-crosslinking-of-graphene-quantum-dots-by-mcmurry-deoxygenation-coupling
#5
Shaowei Chen, Limei Chen, Peiguangf Hu, Jia En Lu
Graphene quantum dots were covalently crosslinked forming ensembles of a few hundred nanometers in size by McMurry deoxygenation coupling reactions of peripheral carbonyl functional moieties catalyzed by TiCl4 and Zn powders in refluxing THF, as manifested in TEM, AFM, FTIR, Raman and XPS measurements. Photoluminescence measurements showed that after chemical coupling, the excitation and emisison peaks blue-shifted somewhat and the emission intensity increased markedly, likely due to the removal of oxygenated species where quinone-like species were known to be effective electron-acceptors and emission quenchers...
March 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28328174/a-strategy-to-design-hyperpolarized-%C3%A2-%C3%A2-c-magnetic-resonance-probes-using-1-%C3%A2-%C3%A2-c-%C3%AE-amino-acid-as-a-scaffold-structure
#6
Tatsuya Nishihara, Yutaka Kameyama, Hiroshi Nonaka, Yoichi Takakusagi, Fuminori Hyodo, Kazuhiro Ichikawa, Shinsuke Sando
Hyperpolarization is an emerging method that dramatically enhances NMR signal intensity. As a result of the increased sensitivity, hyperpolarized (HP) NMR molecular probes can be used to perform time-resolved spectroscopy and imaging in vitro and in vivo. It is however challenging to design such probes de novo. We herein report the [1-¹³C]α-amino acid as a scaffold structure to design HP ¹³C NMR molecular probe. The [1-¹³C]α-amino acid can be converted to various HP ¹³C chemical probes that show sufficient chemical shift change by altering the chemical state of α-nitrogen upon the interaction with the target...
March 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28328163/chemoselective-hydrazine-mediated-transfer-hydrogenation-of-nitroarenes-by-co3-o4-nanoparticles-immobilized-on-an-al-si-mixed-oxide-support
#7
P Linga Reddy, Mohit Tripathi, R Arundhathi, Diwan S Rawat
Cobalt oxide nanoparticles (size 2 to 3.5 nm) were successfully impregnated on an alumina-silica (mixed oxide) support through an experimentally viable and easily reproducible protocol. The prepared material was well characterized by XRD, HR-TEM, BET surface area, EDX and XPS analyses. Porous alumina-silica having a high surface area served as a protective heterogeneous support on which the well-dispersed Co3 O4 nanoparticles served as an active catalytic species for the hydrazine-mediated transfer hydrogenation of nitroarenes...
March 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28328111/light-controlled-release-and-uptake-of-zinc-ions-in-solution-by-a-photochromic-terthiazole-based-ligand
#8
Juliette Guérin, Anne Léaustic, Jérôme Berthet, Rémi Métivier, Régis Guillot, Stéphanie Delbaere, Keitaro Nakatani, Pei Yu
We have synthesized and fully characterized a photochromic zinc complex with a terphenylthiazole-based ligand with a salen-like cavity. The solution stability of the complex was found to be greatly dependent on the state of the photochromic ligand and an interesting photo-triggered release and uptake of zinc ions was found as well as monitored by its fluorescence. The contrasting stability difference of the zinc complex between its two isomeric states was rationalized by DFT calculations.
March 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28326679/synthesis-of-pyridine-zinc-based-porous-organic-polymer-for-cocatalyst-free-cycloaddition-of-epoxides
#9
He Li, Chunzhi Li, Jian Chen, Lina Liu, Qihua Yang
Synthesis of solid catalysts for co-catalyst free CO2 cycloaddition reaction has attracted much research attention. Herein we report a hierarchical porous organic polymer, Py-Zn@MA which could catalyze cycloaddition reaction with epoxides and CO2 without using any additives or co-catalyst to afford turnover frequency (TOF) as high as 250 and 97 h-1 at 130 oC using pure and diluted CO2 (a simulating flue gas), respectively. These results are superior to most ever reported heterogeneous co-catalyst free systems...
March 22, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28322511/controllable-self-assembly-of-amphiphilic-zwtterionic-pbi-towards-tunable-surface-wettability-of-the-nanostructures
#10
Meizhen Yin, Yong Ye, Baozhong Lü, Wenyu Cheng, Zhen Wu, Jie Wei
Amphiphilic molecules have obtained wide attentions for a few decades due to they possess both hydrophobic and hydrophilic properties, and can form diverse nanostructures in selective solvents. Herein, we report an asymmetric amphiphilic zwitterionic perylene bisimide (AZP) with an octyl chain and a zwitterionic group on the opposite imide positions of perylene tetracarboxylic dianhydride. The controllable nanostructures of AZP with tunable hydrophilic/hydrophobic surface have been investigated through solvent-dependent amphiphilic self-assembly as confirmed by SEM, TEM, and contact angle...
March 21, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28319359/de-novo-synthesis-of-mono-and-oligosaccharides-via-dihydropyran-intermediates
#11
Wangze Song, Shuojin Wang, Weiping Tang
The importance of carbohydrates is evident by its essential role in all living systems. Their syntheses have attracted chemists' attention for over a century. Most chemical syntheses in this area focused on the preparation of carbohydrates from naturally occurring monosaccharides. De novo chemical synthesis of carbohydrates from feedstock starting materials has emerged as a complementary method for the preparation of diverse mono- and oligosaccharides. In this review, we will briefly discuss the history of de novo carbohydrate synthesis and focus on methods that address the formation of glycosidic bonds for potential de novo synthesis of oligosaccharides...
March 20, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28317319/surface-triggered-tandem-coupling-reactions-of-cyclic-azasilanes
#12
Youlin Pan, Annalese Maddox, Taewoo Min, Ferdinand Gonzaga, Jonathan Goff, Barry Arkles
Cyclic azasilanes have been synthesized for the purpose of developing coupling agents appropriate for a variety of nanotechnologies including surface modification of nanoparticles, nanocrystals, mesoporous materials and substrates. N-methyl-aza-2,2,4-trimethylsilacyclopentane is representative of this class of compounds. Preliminary data for the treatment of inorganic surfaces, including nanoparticles and oxidized silicon wafers, with cyclic azasilanes suggest high density monolayer deposition by a ring-opening reaction...
March 20, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28317269/hyper-assembly-of-self-assembled-glycoclusters-mediated-by-specific-carbohydrate-carbohydrate-interactions
#13
Gengwei Yan, Takumi Yamaguchi, Tatsuya Suzuki, Saeko Yanaka, Sota Sato, Makoto Fujita, Koichi Kato
Hybridization of a self-assembled, spherical complex with oligosaccharides containing Lewis X, a functional trisaccharide displayed on various cell surfaces, yielded well-defined glycoclusters. The self-assembled glycoclusters exhibited homophilic hyper-assembly in aqueous solution in a Ca2+-dependent manner through specific carbohydrate-carbohydrate interactions, offering a structural scaffold for functional biomimetic systems.
March 20, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28303660/brazilin-inhibits-prostatic-acidic-phosphatase-fibrillogenesis-and-reduces-its-cytotoxicity
#14
Ming Li, Xiaoyan Dong, Yang Liu, Yan Sun
The 39-amino acid peptide fragment derived from prostatic acidic phosphatase (PAP), PAP248-286, is secreted in large amount into human semen and form amyloid fibrils. The fibrils can capture HIV virions and increase the attachment of virions to target cells, so they are called semen-derived enhancer of virus infection (SEVI). Therefore, it is of significance to inhibit the formation of PAP248-286 amyloid fibrils. Herein, we have demonstrated that brazilin could effectively inhibit PAP248-286 aggregation. The inhibition effect increased with increasing brazilin concentration...
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28301082/ch3nh3pbbr3-perovskite-nanocrystals-as-efficient-light-harvesting-antenna-for-fluorescence-resonance-energy-transfer
#15
Vijayakumar C Nair, Chinnadurai Muthu, Anuja Vijayan
Hybrid perovskites have created enormous research interest as a low-cost material for high-performance photovoltaic devices, light-emitting diodes, photodetectors, memories and sensors. Perovskite materials in nanocrystal form, show intense luminescence due to quantum confinement effect, were found to be particularly suitable for most of these applications. However, the potential use of perovskite nanocrystals as a light harvesting antenna for possible applications in artificial photosynthesis systems is not yet explored...
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28300345/benzimidazole-pyridoimidazole-cored-organic-sensitizers-for-high-performance-dye-sensitized-solar-cells
#16
Sumit Chaurasia, Chun Ting Li, Mulu Berhe Desta, Jen Shyang Ni, Jiann T Lin
A new series of benzimidazole (BIm) based dyes (SC32 and SC33) and pyridoimidazole (PIm) based dyes (SC35 and SC36) were synthesized as the sensitizers for dye-sensitized solar cells. The N-substituent and C-substituent at the BIm and PIm cores was found to be the dominating factor in deciding the electronic properties of the dyes and their DSSCs performance. The efficiency of BIm-based dyes (SC35 and SC36) was found higher than the BIm-based dyes (SC32 and SC33) due to better light harvesting. The C-substituent in SC36, 4-hexylloxybenzene, is beneficial to dark current suppression, and hence SC36 achieves the best efficiency of 7...
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28299911/sequence-dependent-self-assembly-of-chiral-polyimides
#17
Chuanqing Kang, Jijun Yan, Zheng Bian, Rizhe Jin, Xiaoye Ma, Zhijun Du, Haibo Yao, Lianxun Gao
Sequence-defined chiral polyimides comprising identical asymmetric diamine monomers arranged in different directions along the main chain were designed and prepared. These new sequence-defined polymers exhibit sequence-dependent self-assembly behaviors and responses to ibuprofen enantiomers, as revealed by their chiroptical spectra and gelation properties. For the first time, the self-assembly of polymers and their interactions with guest molecules have been successfully controlled by means of the directional arrangement of the monomers in their polymer backbones...
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28299910/amorphous-hole-transporting-material-based-on-2-2-bissubstituted-1-1-biphenyl-scaffold-for-application-in-perovskite-solar-cells
#18
Artiom Magomedov, Nobuya Sakai, Egidijus Kamarauskas, Marius Franckevičius, Gabrielė Jokubauskaitė, Vygintas Jankauskas, Henry J Snaith, Vytautas Getautis
Perovskite solar cells are considered as promising technology for solar energy conversion with the power conversion efficiencies, currently exceeding 20%. In the majority of the record devices Spiro-OMeTAD is used for the positive charge extraction and transport layer. Although, a number of alternative hole transporting materials with different aromatic or heteroaromatic fragments have already been synthesized, a cheap and well performing hole transporting material is still in huge demand. In this work we present two-step synthesis of a novel carbazole-based hole transporting material...
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28299898/three-component-asymmetric-mannich-reaction-catalyzed-by-a-lewis-acid-with-rhodium-centered-chirality
#19
Lihe Feng, Xuemei Dai, Eric Meggers, Lei Gong
A highly efficient direct asymmetric three-component Mannich reaction out of an N-acylpyrazole, an aldehyde, and a primary or secondary amine was enabled by a rhodium-based Lewis acid catalyst with metal-centered chirality. Excellent enantioselectivities were achieved for a variety of substrates at a typical catalyst loading of merely 0.5 mol% (21 examples, up to 98% ee).
March 16, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28294561/pyridinium-substituted-tetraphenylethylene-entailing-alkyne-moiety-enhancement-of-photosensitizing-efficiency-and-antimicrobial-activity
#20
Xue You, Huili Ma, Yuancheng Wang, Guanxin Zhang, Qian Peng, Libing Liu, Shu Wang, Deqing Zhang
Apart from sensing and imaging, luminogens with aggregation-induced emission are also interesting for photosensitizing. In this paper, we report the photosensitizing behavior and bacteria-killing performance of a new pyridinium substituted tetraphenylethylene with an alkyne group (TPE-A-Py+). Interestingly, TPE-A-Py+ exhibits higher photosensitizing efficiency than TPE-Py+ (without alkyne group) with I- as the counter anion. This is well explained by the fact that the energy gap between the excited singlet state (S1) and triplet state (T1) is lower for TPE-A-Py+ in comparison with that of TPE-Py+ on the basis of theoretical calculations...
March 14, 2017: Chemistry, An Asian Journal
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