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Chemistry, An Asian Journal

Paresh Chandra Ray, Avijit Pramanik, Suhash Reddy Chavva, Bhanu Priya Viraka Nellore, Kelli May, Tejus Matthew, Stacy Jones, Aruna Vangara
Even in 21st century, prostate cancer remains the second leading cause of cancer death for men. Since normal prostate gland contains the most Zn(II) and there are huge differences in Zn(II) content between the healthy and malignant prostate cancer cells, mobile zinc can be used as a biomarker for prostate cancer prediction. Current article reports the design of novel and highly efficient surface enhanced Raman spectroscopy (SERS) probe using p-(imidazole)azo) benzenethiol attached gold nanoparticle as a Raman reporter, which has the capability to identify prostate cancer cells based on Zn(II) sensing...
January 19, 2017: Chemistry, An Asian Journal
Nejib Dwadnia, Julien Roger, Nadine Pirio, Hélène Cattey, Ridha Ben Salem, Jean-Cyrille Hierso
A method that allows hindered ortho-substituted aryl iodides to be efficiently coupled to phenylboronic acid using a gold-catalyzed C-C bond formation is presented. The use of a molecularly-defined dinuclear gold chloride catalytic precursor that is stabilized by a new tetradentate (N,N')-diamino-(P,P')-diphosphino ferrocene hybrid ligand in a Suzuki-type reaction is described for the first time. Electron-rich isopropyl groups on phosphorus were found essential for a superior activity, while the performances of a set of analogous gold dinuclear complexes that were fully characterized by multinuclear NMR spectroscopy and XRD analysis, were investigated...
January 18, 2017: Chemistry, An Asian Journal
Zheng-Ze Pan, Liubing Dong, Wei Lv, Dequn Zheng, Zhengjie Li, Chong Luo, Cheng Zheng, Quan-Hong Yang, Feiyu Kang
Controlling the microstructure of biomass-derived carbon is of essential importance for directing its use. Herein, a hollow spherical carbon (HSC) was prepared from corncob lignin through spray drying and the subsequent heat treatment. The HSC, which is characterized by the hierarchically porous structure, delivers high rate capability when it is directly used as the electrode material for supercapacitors. This strategy that uses lignin as the precursor avoids the intrinsic difficulty in tuning the micro-structure of the biomass-derived carbons and is suitable for mass production for practical use...
January 18, 2017: Chemistry, An Asian Journal
Da-Hui Qu, Wen-Zhi Wang, Chuan Gao, Qi Zhang, Xu-Hao Ye
A well-defined supramolecular helical nanofibers has been constructed by a rationally designed achiral monomer in aqueous solution based on the 1:2 host-guest combination between cucurbit[8]uril and a 4,4'-bipyridin-1-ium chloride (BPY+) salt derivative. The formed nanostructures could be adjusted by varying the concentration of monomer from helical nanofibers to pH-responsive hydrogel.
January 18, 2017: Chemistry, An Asian Journal
Kripal S Lakhi, Dae-Hwan Park, Stalin Joseph, Siddulu N Talapaneni, Ugo Ravon, Khalid Al-Bahily, Ajayan Vinu
Mesoporous carbon nitrides (MCN) with rod shaped morphology and tunable nitrogen contents have been synthesized via calcination free method using ethanol-washed mesoporous SBA-15 as templates at different carbonization temperatures. Carbon tetrachloride (CTC) and ethylenediamine (EDA) were used as the sources of carbon and nitrogen respectively. The resulting MCN materials were characterized with low and high angle power XRD, N2 adsorption, HR-SEM, HR-TEM, CHN elemental analysis, XPS and. XANES techniques. It is observed that the carbonization temperature plays a critical role in controlling not only the crystallinity but also the nitrogen content and the textural parameters of the samples including specific surface area and specific pore volume...
January 16, 2017: Chemistry, An Asian Journal
Zhigang Xie, Lei Wang, Sisi Zhao, Xiaohua Zheng, Li Chen
Controllable synthesis of coordination polymers (CPs) Isomers and reveal the corresponding relationship of structures and properties remains an enormous challenge. Three new supramolecular isomers have been synthesized by tuning the poly(ethylene glycol) (PEG) content in the feed. Those supramolecular isomers have the same framework formula of [Cu2I2(tppe)] and different architectures from the classical 2D stacking framework, to 3D entangled system with the co-existence of interpenetration and polycatenation, and 3D topological framework...
January 16, 2017: Chemistry, An Asian Journal
Sanjeevi Jayakumar, He Li, Yaopeng Zhao, Jian Chen, Qihua Yang
Cocatalyst-free ionic liquids (ILs)-based porous polymers (Px-Vy-OHzR) functionalized with intermolecular hydroxyl group were prepared via radical copolymerization of 1-butyl-3-vinylimidazolium bromide, (4-vinylphenyl)methanol (VBzOH), and divinylbenzene (DVB) under solvothermal conditions. As the ratio of 4-vinylphenylmethanol in initial mixture increases, the content of hydroxyl groups in the polymer increases from 3.35 mmol/g to 5.35 mmol/g and the Brunauer-Emmett-Teller (BET) surface area of polymer decreases sharply from 365 m2g-1 to 2...
January 12, 2017: Chemistry, An Asian Journal
Tao Tu, Haibo Zhu, Yajing Shen, Qinyue Deng, Changyu Huang
A practical and straightforward bimetallic Pd-Cu catalytic system has been successfully developed for synthesis of sulfonamides in one-pot manner from easily handle and readily available boronic acids, sulfur dioxide surrogate DABSO and O-benzoyl hydroxylamines in high yields. Without additional ligands, the newly developed catalytic system reveals a broad substrate scope for both partners and tolerates a wide array of functional groups even at low catalyst loadings. Furthermore, based on the control experiments, a plausible mechanism has been proposed, in which sodium sulfinate has been isolated and identified as the crucial intermediate for this straightforward bimetallic catalytic transformation...
January 12, 2017: Chemistry, An Asian Journal
Shih-Sheng Sun, Mekonnen Abebayehu Desta, Chia-Wei Liao
A unique strategy for effectively suppressing charge recombination and enhancing light harvesting in dye-sensitized solar cells (DSSCs) is demonstrated by designing a new dipolar organic dye functionalized with a diacetylene unit, which is capable of undergoing photoinduced cross-linking reaction to generate a hydrophobic polydiacetylene layer. The polydiacetylene layer serves as not only an electrolyte-blocking layer to effectively block the approaching of the oxidized redox mediator and supress the dark current but also light-harvesting role by efficient energy transfer to the dipolar dyes...
January 12, 2017: Chemistry, An Asian Journal
Yingle Liu, Ke Zhang, Weidong Jiang, Yi Yang, Yan Jiang, Xiaoqiang Liu, Ying Xie, Jincai Wu, Junjie Cai, Xiu-Hua Xu
A general method for the synthesis of 1-difluoroalkyl isoquinolines through a palladium-catalyzed radical cascade difluoroalkylation-cyclization of vinyl isocyanides with bromodifluoroacetic derivants is described.The difluoroalkylation-cyclization products can also be readily converted to more valuable gem-difluorocontaining compounds.
January 11, 2017: Chemistry, An Asian Journal
Xiangyang Tang, Tong Shan, Qing Bai, Hongwei Ma, Xin He, Ping Lu
Developing efficient deep blue materials is a long term research focus in the field of organic light emitting diodes (OLEDs). In this paper, we report two deep blue molecules, PITO and PISF, which share similar chemical structures but exhibit different photophysical and device properties. These two molecules consist of phenanthroimidazole and dibenzothiophene analogues. The distinction of their chemical structures lies in the different oxidation states of the S atom. For PITO, the S atom is oxidized and the resulting structure dibenzothiophene S,S-dioxide becomes electron deficient...
January 10, 2017: Chemistry, An Asian Journal
Chun-Ting Li, Ryan Yeh-Yung Lin, Jiann T Lin
Aqueous dye-sensitized solar cells (DSSCs) are attractive due to sustainability and safety of using water as the solvent of the redox mediators, and possible applications of photoelectrochemical water splitting. However, higher tendency of dye-leaching by water and lower wettability of dye molecules are two major obstacles need to be tackled for future applications of aqueous DSSCs. Sensitizers designed for aqueous DSSCs are discussed based on their functions, such as modification of the molecular skeleton and the anchoring group for better stability against dye-leaching by water, and incorporation of hydrophilic entity in the dye molecule or addition of surfactant to the system to increase wettability of the dye for more facile dye regeneration...
January 10, 2017: Chemistry, An Asian Journal
Yahong Li, Haifeng Zhang, Rui Liu, Jin Zhang, Wei Liu, Yaping Dong
Five hexanuclear lanthanide clusters of compositions [Ln6(μ4-O)2(HCOO)2L4(HL')2(DMF)2] (Ln = Dy (1), Er (2), Ho (3), Tb (4), Gd (5); H2L = 2-((2-(hydroxymethyl)phenylimino)methyl)-6-methoxy-phenol; H3L' = 3-((2-(hydroxymethyl)phenylimino)methyl) benzene-1,2-diol, and H3L' was derived in situ from the H2L ligand) have been prepared under solvothermal conditions. The [Ln6] cores of 1-5 possess an unprecedented motif, namely, two tetrahedron Ln4 units sharing an edge and two vertices. The six LnIII ions of 1-5 are connected via two μ4-O anions...
January 9, 2017: Chemistry, An Asian Journal
Bengang Xing, Linna Lyu, Fang Liu, Xiaoyong Wang, Ming Hu, Jing Mu, Haolun Cheong, Gang Liu
Multidrug resistance (MDR) places a major burden against cancer treatment. As one important factor contributing to MDR, over-expression of P-glycoprotein (P-gp), results in the reduced intracellular drug accumulation. Hence, the ability to effectively block the efflux protein and accumulate the therapeutics in cancer cells is of great significance in clinical practice. In this work, we successfully developed a smart stimulus-responsive short peptide assembled system, termed as PD/VER nanogels, which synergistically combined the acid activatable Doxorubicin (Dox) antitumor prodrug with the P-gp inhibitor (Verapamil, VER) for reversing MDR...
January 9, 2017: Chemistry, An Asian Journal
Miao Zhang, Lin Liu, Teng He, Zhao Li, Guotao Wu, Ping Chen
Significant progresses have been made on the synthesis and application of mesoporous γ-alumina. To date, little attention has been paid on the synthesis of microporous crystalline alumina. Here, we demonstrated to fabricate microporous crystalline γ-alumina using a microporous covalent triazine framework (CTF-1) as a template. Microporous crystalline γ-alumina with a micro-meso binary pore system was replicated by infiltration of aluminum nitrate into the micropores of CTF-1 template through a NH3/water vapor induced internal hydrolysis method, followed by thermal treatment, and subsequent removal of CTF-1 template with 30% H2O2 solution...
January 9, 2017: Chemistry, An Asian Journal
Yang Lu, Yi Liu, Ya-Zhong Dai, Chi-Yuan Yang, Hio-Ieng Un, Si-Wei Liu, Ke Shi, Jie-Yu Wang, Jian Pei
A novel electron-deficient building block, 5,5'-diazaisoindigo (5DNIID), was synthesized through a facile method in good yield. As a derivative of isoindigo, 5DNIID shows an ultra-low LUMO level of -3.92 eV after incorporation of two electron-deficient nitrogen atoms into the para-position of the amine groups in the isoindigo π skeleton. Modified polymerization conditions were applied to efficiently afford the donor-acceptor (D-A) conjugated polymer 5DNIID-2T, which exhibited a p-type charge transport property...
January 9, 2017: Chemistry, An Asian Journal
Vitaliy Yu Markov, Sergey I Troyanov
High-temperature chlorination of HPLC fullerene fractions containing mainly C92 /C94 and C102 /C104 resulted in the isolation and X-ray structural characterization of chloro derivatives of azafullerenes, C59 NCl5 and C97 NCl21 . It was assumed that formation of azafullerenes in the arc-discharge synthesis of fullerenes occurred due to air leakage into the reactor. The molecule of C59 NCl5 contains an isolated aromatic pyrrole ring on the fullerene cage and possesses C5v symmetrical shape typical of other known C59 NR5 derivatives...
January 6, 2017: Chemistry, An Asian Journal
Alvi Muhammad Rouf, Jingjing Wu, Jun Zhu
The BN-doped organic analogues are interesting as aliphatic amineboranes for hydrogen storage, precursors for aromatic borazines and adsorbent cage azaboranes. However, BN-doped aliphatic polyenes remained undeveloped. Herein, we perform theoretical calculations on two mono BN-doped aliphatic lower polyenes, 1,3-butadiene and 1,3,5-hexatriene. A general rule is proposed, i.e., isomers with terminal nitrogen and directly BN-connected, N-B(R), in particular, are of significant thermodynamic stability than their inverse analogues (where boron is at the terminal position)...
January 5, 2017: Chemistry, An Asian Journal
Afang Zhang, Jun Wang, Feng Shao, Wen Li, Jiatao Yan, Kun Liu, Pei Tao, Toshio Masuda
We present investigation on supramolecular assembly of C3-molecules benzene-1,3,5-tricarboxamides carrying tetrapeptide Gly-Ala-Gly-Ala pendants driving competitively by hydrogen bonding and metal ion coordination. Gly-Ala peptide sequence was selected as it is the most abundant repeating units in silkworm silk, and known to be able to form β-sheets through efficient intermolecular hydrogen bonds. These C3-peptides were found to form long helical fibers in solvents mainly due to strong hydrogen bonding. However, in the presence of divalent metal ions, chirality of these helical fibers was enhanced through metal coordination and can be transformed into nanospheres with excess amount of the ions...
January 5, 2017: Chemistry, An Asian Journal
Yoshihiro Kamimura, Keiji Itabashi, Yoshihiro Kon, Akira Endo, Tatsuya Okubo
Seed-assisted synthesis of zeolite without using organic structure-directing agents (OSDAs) has enabled alternative routes to simple, environmentally friendly and low-cost production of industrially important zeolites. In this study, the successful seed-assisted synthesis of MCM-22 (MWW-type) zeolite with OSDA-free gel is reported for first time. MWW-type zeolite is obtained by the addition of as-synthesized MCM-22 seeds prepared with hexamethyleneimine (HMI) into OSDA-free Na-aluminosilicate gels. Based on the results of XRD, ICP-AES, NMR, N₂ physisorption and NH₃-TPD, product exhibited different features compared to those of the seeds...
January 5, 2017: Chemistry, An Asian Journal
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