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Naphthalene

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https://www.readbyqxmd.com/read/28430400/highly-sensitive-hplc-method-for-the-determination-of-galantamine-in-human-plasma-and-urine-through-derivatization-with-dansyl-chloride-using-fluorescence-detector
#1
Elif Özdemir, Sevgi Tatar Ulu
A new method based on fluorescence derivatization with 5-(dimethylamino) naphthalene-1-sulfonyl chloride (dansyl chloride) was developed for the quantitative determination of galantamine in human plasma and urine using high-performance liquid chromatography. The reaction between galantamine and dansyl chloride was optimally realized in 30 min at room temperature and pH 10.5, with a reagent to galantamine molar ratio of 2.13. The derivative was extracted with dichloromethane, and the extract was dried under a nitrogen stream and dissolved in the mobile phase...
April 21, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/28430197/g-quadruplex-organic-frameworks
#2
Yi-Lin Wu, Noah E Horwitz, Kan-Sheng Chen, Diego A Gomez-Gualdron, Norman S Luu, Lin Ma, Timothy C Wang, Mark C Hersam, Joseph T Hupp, Omar K Farha, Randall Q Snurr, Michael R Wasielewski
Two-dimensional covalent organic frameworks often π stack into crystalline solids that allow precise spatial positioning of molecular building blocks. Inspired by the hydrogen-bonded G-quadruplexes found frequently in guanine-rich DNA, here we show that this structural motif can be exploited to guide the self-assembly of naphthalene diimide and perylene diimide electron acceptors end-capped with two guanine electron donors into crystalline G-quadruplex-based organic frameworks, wherein the electron donors and acceptors form ordered, segregated π-stacked arrays...
May 2017: Nature Chemistry
https://www.readbyqxmd.com/read/28429273/assessment-of-the-temporal-and-spatial-distribution-of-atmospheric-pcns-and-their-air-soil-exchange-using-passive-air-samplers-in-shanghai-east-china
#3
Qingqi Die, Zhiqiang Nie, Bo Yue, Xuemei Zhu, Xingbao Gao, Jianyuan Wang, Yufei Yang, Yanyan Fang, Qifei Huang
A total of 47 passive air samples and 25 soil samples were collected to study the temporal trend, distribution, and air-soil exchange of polychlorinated naphthalenes (PCNs) in Shanghai, China. Atmospheric PCNs ranged from 3.44 to 44.1 pg/m(3) (average of 21.9 pg/m(3)) in summer and 13.6 to 153 pg/m(3) (average of 40.0 pg/m(3)) in winter. In the soil samples, PCN concentrations were 54.7-1382 pg/g dry weight (average of 319 pg/g). Tri-CNs and tetra-CNs were two dominant homolog groups in air samples, while di-CNs were also found at comparable proportions to tri-CNs and tetra-CNs in soil samples...
April 21, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28426225/quantum-design-of-%C3%AF-electron-ring-currents-in-polycyclic-aromatic-hydrocarbons-parallel-and-antiparallel-ring-currents-in-naphthalene
#4
Hirobumi Mineo, Yuichi Fujimura
Control of π-electrons in polycyclic aromatic hydrocarbons (PAHs) is one of the fundamental issues in optoelectronics for ultrafast optical switching devices. We have proposed an effective scenario for design of the generation of coherent ring currents in naphthalene (D2h), which is the smallest unit of planar PAHs. It has been demonstrated by using quantum chemical calculations and quantum optimal control (QOC) simulations that two types of ring currents, parallel and antiparallel ones, can be generated by resonance excitations by two linearly polarized lasers...
April 20, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28426056/chemical-pathways-for-poly-anionic-isomerisation-in-the-metastable-anions-of-tetra-deprotonated-naphthalene-an-intra-molecular-inter-ring-proton-transfer
#5
Vikas, Poonam Sangwan, Ramanpreet Kaur
A surprising chemical pathway involving an intra-molecular proton-transfer between the two different aromatic rings of naphthalene is revealed while exploring the isomerisation in the metastable tetra-anionic species of tetra-deprotonated naphthalene. The pathways are explored through quantum-mechanical computations employing a global reaction route mapping (GRRM) strategy. Notably, several other pathways traced exhibit interesting aspects of poly-anionic isomerisation in the multiply-charged metastable molecular anions, which can provide valuable insights into the mechanisms of ring closure and expansion leading to species like azulenes, cyclodecapentaene, and phenylvinylacetylene...
April 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28424859/investigation-of-carbon-based-nanomaterials-as-sorbents-for-headspace-in-tube-extraction-of-polycyclic-aromatic-hydrocarbons
#6
Xochitli L Osorio Barajas, Thorsten Hüffer, Pascal Mettig, Beat Schilling, Maik A Jochmann, Torsten C Schmidt
Carbon-based nanomaterials (CNM) represent promising materials for the application as sorbents in micro- and other extraction devices. In this work, we investigate the applicability of five different CNM (multi-walled carbon nanotubes (MWCNTs), fullerenes, carboxylic acid functionalized multi-walled carbon nanotubes (MWCNTs-COOH), graphene platelets, and carbon nanohorns) for their performance on PAH extraction from the aqueous phase by headspace in-tube extraction (HS-ITEX). Optimal extraction parameters for HS-ITEX were determined using a Box-Behnken experimental design...
April 19, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28423895/supramolecularly-engineered-%C3%AF-amphiphile
#7
Priya Rajdev, Saptarshi Chakraborty, Marc Schmutz, Philippe J Mésini, Suhrit Ghosh
This article describes self-assembly of supramolecularly engineered naphthalene-diimide (NDI) derived amphiphiles NDI-1 and NDI-2. They have the same hydrophobic/ hydrophilic balance but merely differ by a single functional group, amide or ester, respectively. They exhibit distinct self-assembly in water; NDI-1 form hydrogel which upon aging forms crystals while NDI-2 forms micelle as revealed by in-depth structural analysis using cryo-TEM, DLS and SAXS studies. These results suggest H-bonding among the amide groups fully regulates the self-assembly by overruling the packing parameters...
April 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28423893/the-least-stable-isomer-of-bn-naphthalene-toward-predictive-trends-for-the-optoelectronic-properties-of-bn-acenes
#8
Zhiqiang Liu, Jacob S A Ishibashi, Clovis Darrigan, Alain Dargelos, Anna Chrostowska, Bo Li, Monica Vasiliu, David A Dixon, Shih-Yuan Liu
The least stable isomer of the parental BN naphthalene series has been synthesized in a simple four-step sequence. Its experimental electronic structure characterization via UV-PES, cyclic voltammetry, and UV-Vis spectroscopy in direct comparison with three other known BN naphthalene isomers has established two guiding principles for predicting the electronic structures of BN acene compounds: 1) Orientational BN isomers have similar HOMO-LUMO gaps. 2) For each pair of orientational BN isomers, the more thermodynamically stable compound has the lower HOMO energy...
April 19, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28422334/polymer-supported-palladium-ii-carbene-complexes-catalytic-activity-recyclability-and-selectivity-in-c-h-acetoxylation-of-arenes
#9
Maitham H Majeed, Payam Shayesteh, Reine Wallenberg, Axel R Persson, Niclas Johansson, Lei Ye, Joachim Schnadt, Ola F Wendt
Heterogeneous catalysts for selective oxidation of C-H bonds were synthesized by co-polymerization of new N-heterocyclic carbene-palladium(II) (NHC-Pd(II)) monomers with divinylbenzene. The polymer-supported NHC-Pd(II) catalyses undirected C-H acetoxylation of simple and methylated arenes as well as polyarenes, with similar or superior efficiency compared to their homogeneous analogues. In particular, the regioselectivity has been improved in the acetoxylation of biphenyl and naphthalene compared to the best homogeneous catalysts...
April 19, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28418624/nickel-cornered-molecular-rectangles-as-polycyclic-aromatic-hydrocarbon-receptors
#10
Víctor Martínez-Agramunt, Sheila Ruiz-Botella, Eduardo Peris
Two nickel-cornered organometallic metalla-rectangles containing a pyrene-linked-di-N-heterocyclic carbene have been prepared. The dimensions of one side of the rectangle were modulated by either using pyrazine or 4,4'-bipyridine. The two molecules were tested as hosts for the recognition of seven small polycyclic aromatic hydrocarbons (PAHs) in [D6 ]acetone. By using (1) H NMR spectroscopy titrations, it could be established that the host-guest stoichiometries of the inclusion complexes formed were 1:1 for the pyrazine-based host, and 1:2 for the host containing bipyridine, in accordance with the larger dimensions of the latter...
April 18, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28417117/poly-naphthalene-diimide-vinylene-solid-state-red-emission-and-semiconducting-properties-for-transistors
#11
Xianfeng Liang, Luxi Tan, Zitong Liu, Yanping Ma, Guanxin Zhang, Lin Wang, Shayu Li, Lichun Dong, Jing Li, Wei Chen
In this work, a conjugated polymer PNV is developed, linking naphthalene diimide with a vinyl linkage. Owing to the C-HO hydrogen bond between the carbonyl and the vinyl, PNV exhibits a high red emission with a quantum yield of 33.4% in the solid state while it shows n-type properties with an electron mobility up to 1.5 × 10(-3) cm(2) V(-1) s(-1) in organic field effect transistors, simultaneously.
April 18, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28415390/synthesis-spectroscopic-and-dna-binding-ability-of-co-ii-ni-ii-cu-ii-and-zn-ii-complexes-of-schiff-base-ligand-e-1-1h-benzo-d-imidazol-2-yl-methylimino-methyl-naphthalen-2-ol-x-ray-crystal-structure-determination-of-cobalt-ii-complex
#12
Naeema H Yarkandi, Hoda A El-Ghamry, Mohamed Gaber
A novel Schiff base ligand, (E)-1-(((1H-benzo[d]imidazol-2-yl)methylimino)methyl)naphthalen-2-ol (HL), has been designed and synthesized in addition to its metal chelates [Co(L)2]·l2H2O, [Ni(L)Cl·(H2O)2].5H2O, [Cu(L)Cl] and [Zn(L)(CH3COO)]. The structures of the isolated compounds have been confirmed and identified by means of different spectral and physicochemical techniques including CHN analysis, (1)H &(13)C NMR, mass spectral analysis, molar conductivity measurement, UV-Vis, infrared, magnetic moment in addition to TGA technique...
June 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28411431/simultaneous-removal-of-cd-ii-ni-ii-pb-ii-and-cu-ii-ions-via-their-complexation-with-hbansa-based-on-a-combined-ultrasound-assisted-and-cloud-point-adsorption-method-using-csg-bipo4-fepo4-as-novel-adsorbent-faas-detection-and-optimization-process
#13
Shadi Kheirandish, Mehrorang Ghaedi, Kheibar Dashtian, Ramin Jannesar, Morteza Montazerozohori, Faezeh Pourebrahim, Mohammad Ali Zare
Ultrasound irradiation, cloud point and adsorption methods were coupled to develop a new technique for the simultaneous removal of Cd(II), Ni(II), Pb(II) and Cu(II) ions after their complexation with (E)-4-((2-hydroxybenzylidene) amino) naphthalene-1-sulfonic acid (HBANSA). In order to reduce cost and improve practicability of process, chitosan gel (CSG) composited with bismuth(III) phosphate/iron(III) phosphate nanoparticles (CSG-BiPO4/FePO4) were hydrothermally synthesized followed by their characterization using FE-SEM, EDS and XRD analysis...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28409887/a-blue-diketopyrrolopyrrole-sensitizer-with-high-efficiency-in-nio-based-dye-sensitized-solar-cells
#14
Fabrice Odobel, Yoann Farre, Mahfoudh Raissi, Arnaud Fihey, Yann Pellegrin, Errol Blart, Denis Jacquemin
We have prepared a series of four new diketopyrrolopyrroles (DPPs) based sensitizers that exhibit high molar extinction coefficients, extended absorption into the long wavelengths and well suited photoredox properties to act as sensitizers in p-DSSCs. These new DPP dyes, composed of a thienyl DPP core, are substituted on one end either by a thiophene carboxylic (Th) or a 4,4'-((phenyl)aza)dibenzoic acid as anchoring group and, on the other extremity, either by a proton or a naphthalene diimide (NDI) moiety...
April 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28403783/synthesis-and-evaluation-of-2-naphthaleno-trans-stilbenes-and-cyanostilbenes-as-anticancer-agents
#15
Nikhil R Madadi, Narsimha R Penthala, Amit Ketkar, Robert L Eoff, Vicenta Trujullo-Alonso, Monica L Guzman, Peter A Crooks
A series of novel 2-naphthaleno stilbenes (3a-3h) and cyanostilbenes (5a-5h) have been synthesized as analogs of resveratrol and DMU-212, and evaluated for their anticancer activity against a panel of 54 human cancer cell lines. The analog 5c ((Z)-3-(naphthalen-2-yl)-2-(3,4,5-trimethoxyphenyl) acrylonitrile) was significantly effective against four particular cancer cell lines: i.e. colon cancer cell line COLO 205, CNS cancer cell line SF 539 and melanoma cancer cell lines SK-MEL 5 and MDA-MB-435 with GI50 values of 22 nM, 25 nM, 23 nM and 21 nM, respectively...
April 12, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/28402849/uroplakin-3a-cells-are-a-distinctive-population-of-epithelial-progenitors-that-contribute-to-airway-maintenance-and-post-injury-repair
#16
Arjun Guha, Aditya Deshpande, Aradhya Jain, Paola Sebastiani, Wellington V Cardoso
There is evidence that certain club cells (CCs) in the murine airways associated with neuroepithelial bodies (NEBs) and terminal bronchioles are resistant to the xenobiotic naphthalene (Nap) and repopulate the airways after Nap injury. The identity and significance of these progenitors (variant CCs, v-CCs) have remained elusive. A recent screen for CC markers identified rare Uroplakin3a (Upk3a)-expressing cells (U-CCs) with a v-CC-like distribution. Here, we employ lineage analysis in the uninjured and chemically injured lungs to investigate the role of U-CCs as epithelial progenitors...
April 11, 2017: Cell Reports
https://www.readbyqxmd.com/read/28399705/biophysical-insight-reveals-tannic-acid-as-amyloid-inducer-and-conformation-transformer-from-amorphous-to-amyloid-aggregates-in-concanavalin-a-cona
#17
Mohsin Vahid Khan, Mohd Ishtikhar, Mohammad Khursheed Siddiqui, Masihuz Zaman, Tajalli Ilm Chandel, Nabeela Majid, Mohd Rehan Ajmal, Ali Saber Abdelhameed, Yasser E Shahein, Rizwan Hasan Khan
The aggregation phenomenon (amyloid and amorphous) is associated with several pathological complications in human, such as Alzheimer's, Parkinson's, Huntington, Cataract diseases and Diabetes mellitus type 2. In the present study we are offering evidence and breaking the general belief with regard to the polyphenols action as protein aggregate inhibitors. Herein we confirm that tannic acid (TA) is not only an amyloid inducer, but also it switches one type of conformation, ultimately morphology, into another...
April 11, 2017: Journal of Biomolecular Structure & Dynamics
https://www.readbyqxmd.com/read/28396086/polymer-modified-fibrous-mesoporous-silica-nanoparticles-as-coating-material-for-open-tubular-capillary-electrochromatography
#18
Yuanyuan Liu, Qing Liu, Haiyan Yu, Shujun Sun, Yun Xue, Yan Wang, Qishu Qu, Chao Yan
A novel fibrous mesoporous silica nanoparticles (fSiO2) stationary phase grafted with polymer (Poly (2-(dimethylamino) ethyl methacrylate) (PDMAEMA) was developed for open tubular capillary electrochromatography (OT-CEC). The preparation procedure included synthesizing fSiO2 through biphase stratification approach, removing the surfactants, silanization and in situ graft polymerization with monomers via atom transfer radical polymerization (ATRP). Subsequently, PDMAEMA-modified mesoporous silica nanoparticles (P-fSiO2)/ethanol solution was immobilized onto the inner surface of the pretreated capillary and functionalized with octadecylsilane to fabricate the open-tubular column...
March 28, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28396085/electrophoretically-mediated-microanalysis-for-simultaneous-on-capillary-derivatization-of-standard-amino-acids-followed-by-micellar-electrokinetic-capillary-chromatography-with-laser-induced-fluorescence-detection
#19
Andrea Celá, Aleš Mádr, Zdeněk Glatz
Amino acids are crucial compounds involved in most biochemical processes essential for life. Since their dynamic turnover reflects the actual physiology of the cell/organism, a turnover assessment may provide valuable information related to multiple physiological and pathophysiological conditions. The sensitive determination of amino acids is predominantly associated with their derivatization which might be laborious, time-consuming and difficult to standardize. However, capillary electrophoresis offers the automatic injection and mixing of reactants, incubation of the reaction mixture, separation and detection of the reaction products in one on-capillary procedure...
March 31, 2017: Journal of Chromatography. A
https://www.readbyqxmd.com/read/28394561/efficient-deep-red-light-sensing-all-polymer-phototransistors-with-p-type-n-type-conjugated-polymer-bulk-heterojunction-layers
#20
Sungho Nam, Jooyeok Seo, Hyemi Han, Hwajeong Kim, Donal D C Bradley, Youngkyoo Kim
Here we demonstrate deep red light-sensing all-polymer phototransistors with bulk heterojunction layers of poly[4,8-bis[(2-ethylhexyl)-oxy]benzo[1,2-b:4,5-b']dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b]-thiophenediyl] (PTB7) and poly[[N,N'-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)] (P(NDI2OD-T2)). The device performances were investigated by varying the incident light intensity of the deep red light (675 nm), while the signal amplification capability was examined by changing the gate and drain voltages...
April 10, 2017: ACS Applied Materials & Interfaces
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