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Journal articles on the topic 'Halogen/neodymium molar ratio'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Bao, Jin Rong, Xiao Wei Zhu, Ran Bo Yu, Jia Yun Zhang, and Xian Ran Xing. "Hydrothermal Synthesis of Neodymium Orthophosphate with Controlled Structure and Morphology." Advanced Materials Research 399-401 (November 2011): 635–40. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.635.

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NdPO4•nH2O nanorods with a pure hexagonal and monoclinic phase were controlled synthesized through a hydrothermal route at low temperature. By simply increasing the molar ratio of PO4/Nd, pure monoclinic NdPO4can be obtained at lower temperature of 180 °C. Furthermore, NdPO4•nH2O nanorods can be assembled into flower- or bundle-shape. The reactant molar ratio played key roles in the formation of the products with different morphologies and structures. The possible formation mechanism for NdPO4 nanorods with different morphologies and structures was discussed. In addition, low-cost preparation

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2

Wang, Xian Li, and Chun Yang Zhang. "Study on the Effects of Molar Ratio of MgO and MgCl₂ on the Properties of Magnesium Cement Straw Board Based on Experiment." Applied Mechanics and Materials 727-728 (January 2015): 258–61. http://dx.doi.org/10.4028/www.scientific.net/amm.727-728.258.

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Magnesium cement-based straw board is made of chloride-oxy-magnesium concrete as gel phase, a new building material with straw as reinforcing phase. The effects of molar ratio of MgO and MgCl2on the static bending strength, softening coefficient and start time back to halogen moisture absorption of magnesium cement-based straw board are analyzed in detail. The result showed that,when n(MgO)/n(MgCl2)=7(molar ratio),the mechanical properties and water resistance are the best, hydration products at this time is dominated by 518 phase.

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3

Grigorieva, D. V., I. V. Gorudko, V. A. Kostevich, et al. "Myeloperoxidase activity in blood plasma as a criterion of therapy for patients with cardiovascular disease." Biomeditsinskaya Khimiya 62, no. 3 (2016): 318–24. http://dx.doi.org/10.18097/pbmc20166203318.

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A significant increase in the myeloperoxidase (MPO) activity has been found in plasma of patients with stable angina and with acute coronary syndrome (ACS) in comparison with the control group. MPO concentration was significantly increased in plasma of ACS patients. Reduced MPO activity in the treated ACS patients correlated with a favorable outcome of the disease. Generally, changes in plasma MPO concentration coincided with changes in lactoferrin concentration thus confirming the role of neutrophil degranulation in the increase of plasma concentrations of these proteins. The increase in MPO

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4

Lopez-Hilfiker, F. D., K. Constantin, J. P. Kercher, and J. A. Thornton. "Temperature dependent halogen activation by N2O5 reactions on halide-doped ice surfaces." Atmospheric Chemistry and Physics 12, no. 11 (2012): 5237–47. http://dx.doi.org/10.5194/acp-12-5237-2012.

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Abstract. We examined the reaction of N2O5 on frozen halide salt solutions as a function of temperature and composition using a coated wall flow tube technique coupled to a chemical ionization mass spectrometer (CIMS). The molar yield of photo-labile halogen compounds was near unity for almost all conditions studied, with the observed reaction products being nitryl chloride (ClNO2) and/or molecular bromine (Br2). The relative yield of ClNO2 and Br2 depended on the ratio of bromide to chloride ions in the solutions used to form the ice. At a bromide to chloride ion molar ratio greater than 1/30

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5

Zhu, Xi, and Yao Rong Wang. "Synthesis of Rare Earth Catalyst LLa[N(TMS)₂]•DME(L=3,5-But₂-2-HO-C₆H₂CH-NH-C₅H₄N) and Catalytic Behavior for Polymerization of Rac-Lactide." Applied Mechanics and Materials 184-185 (June 2012): 1302–6. http://dx.doi.org/10.4028/www.scientific.net/amm.184-185.1302.

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A dianionic phenoxyamido ligand was the first to be used to stabilize organo-rare-earth mental amido complex. Amine elimination reaction of La[N(SiMe3)2]3(THF)2 with 3,5-But2-2-HO-C6H2CH-NH-C5H4N in a 1 : 1 molar-ratio gave the anionic phenoxyamido neodymium amide LLa[N(TMS)2]•DME (1) in a high isolated yield. Furthemore, the catalytic behavior of complex 1 for the ring-opening polymerization of rac-lactide was explored.

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6

Jumadilov, Talkybek, Bakytgul Totkhuskyzy, Zamira Malimbayeva, et al. "Impact of Neodymium and Scandium Ionic Radii on Sorption Dynamics of Amberlite IR120 and AB-17-8 Remote Interaction." Materials 14, no. 18 (2021): 5402. http://dx.doi.org/10.3390/ma14185402.

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The aim of the work is to provide a comparative study of influence of ionic radii of neodymium and scandium ions on their sorption process from corresponding sulfates by individual ion exchangers Amberlite IR120, AB-17-8 and interpolymer system Amberlite IR120-AB-17-8. Experiments were carried out by using the following physicochemical methods of analysis: conductometry, pH-metry, colorimetry, and atomic-emission spectroscopy. Ion exchangers in the interpolymer system undergo remote interactions with a further transition into highly ionized state. There is the formation of optimal conformation

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7

Palermo, Valeria, Diego M. Ruiz, Juan C. Autino, Patricia G. Vázquez, and Gustavo P. Romanelli. "Simple halogen-free synthesis of aryl cinnamates using Mo-Keggin heteropoly acids as catalyst." Pure and Applied Chemistry 84, no. 3 (2011): 529–40. http://dx.doi.org/10.1351/pac-con-11-06-05.

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A convenient chlorine-free procedure for the direct esterification of cinnamic acids with phenols is described. The method does not require stoichiometric activation of the carboxyl group with thionyl chloride or condensing reagents. The methodology is very simple, environmentally friendly, and high-yielding for both electron-releasing and -withdrawing substituted phenols. The Keggin heteropoly acids H3PMo12O40 and H4SiMo12O40 were employed as catalyst in simple bulk form. The effects of temperature, reaction time, and amount of the catalyst used on the ester yield were checked. Suitable condi

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8

Wang, Min, Li Fang Zhang, and Hai Yan Luan. "Synthesis and Photocatalytic Property of FeVO4 Photocatalyst by Sol-Gel Method." Advanced Materials Research 328-330 (September 2011): 1507–11. http://dx.doi.org/10.4028/www.scientific.net/amr.328-330.1507.

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FeVO4 photocatalysts were synthesized by complexing Sol-Gel method using citric acid as chelate and characterized with X-ray diffraction (XRD), scanning electron microsoope(SEM, specific surface area (BET). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. It was found that the sample prepared with the molar ratio of citric acid to metal inons be 2:1, pH=7 and calcinated under 750°C for 4 hours was pure triclinic FeVO4 phase. In the experimental conditions used, the FeVO4 calcined at 750°C had highest photocatalytic acti

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9

Mann, Rekha, Kiranmala Laishram, Sheikh Ashfaq Ahmed, Khavangkhui Zimik, and Neelam Malhan. "Sol Freeze Dry Nd:YAG Nanopowder Synthesis and Sinterability Studies." Defence Science Journal 65, no. 5 (2015): 418. http://dx.doi.org/10.14429/dsj.65.8960.

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<p>Citrate nitrate sol freeze dry synthesis of 2 atomic % neodymium ion doped Yttrium Aluminium Oxide (Nd:YAG) nanopowders was explored for the first time. Sol was prepared by dissolving nitrates of Al3+, Y3+ and Nd3+ keeping molar ratio to be 5: 2.94: 0.06. Total metal ion to citric acid ratio was optimised at 1 is to 0.25. Sol was freeze dried at -80 °C for 48 h. Dried mass thus obtained was calcined at 1000 °C for 2 h to give phase pure Nd:YAG as characterised by FTIR and XRD. Particles were in the size range of 35 nm - 50 nm with close to spherical morphology as observed by TEM. Nano

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10

Lübcke, P., N. Bobrowski, S. Arellano, et al. "BrO/SO<sub>2</sub> molar ratios from scanning DOAS measurements in the NOVAC network." Solid Earth Discussions 5, no. 2 (2013): 1845–70. http://dx.doi.org/10.5194/sed-5-1845-2013.

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Abstract. The molar ratio of BrO to SO2 is, like other halogen/sulphur ratios, a~possible precursor for dynamic changes in the shallow part of a volcanic system. While the predictive significance of the BrO/SO2 ratio has not been well constrained yet, it has the major advantage that this ratio can be readily measured using the remote-sensing technique Differential Optical Absorption Spectroscopy (DOAS) in the UV. While BrO/SO2 ratios have been measured during several short-term field campaigns this article presents an algorithm that can be used to obtain long-term time series of BrO/SO2 ratios

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11

El-Ansary, Aida L., and Nora S. Abdel-Kader. "Synthesis, Characterization of La(III), Nd(III), and Er(III) Complexes with Schiff Bases Derived from Benzopyran-4-one and Thier Fluorescence Study." International Journal of Inorganic Chemistry 2012 (April 11, 2012): 1–13. http://dx.doi.org/10.1155/2012/901415.

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The Schiff bases, L1, L2, and L3, are synthesized from the condensation of 5,7-dihydroxy-6-formyl-2-methylbenzopyran-4-one (L) with 2-aminopyridine (1), p-phenylenediamine (2), and o-phenylenediamine (3). The prepared Schiff bases react with lanthanum (III), neodymium (III), and erbium (III) nitrate to give complexes with stoichiometric ratio (1 : 1) (ligand : metal). The binuclear complexes of Er(III) with L3 and the three metal ions with L2 are separated. The complexes have been characterized by elemental analysis, molar conductance, electronic absorption, and infrared, 1H-NMR spectral studi

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12

Vasnev, V. A., G. D. Markova, B. A. Uvarov, W. Yu Voytekunas, and M. J. M. Abadie. "Catalysis of Trans-esterification Reactions in Model Ester Mixtures." Eurasian Chemico-Technological Journal 7, no. 2 (2017): 79. http://dx.doi.org/10.18321/ectj618.

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<p>Model trans-esterification reaction of n-butylbenzoate with phenyl-p-chlorobenzoate in the molar ratio of 20:1 has been studied. In order to evaluate catalysts based on lanthanide system the activity of nyodymium compounds – neodymium acetate, neodymium acetylacetonate and nitrate complex with benzo-12-crown-4 (neodymium nitrate coronate) – has been studied in the model trans-esterification reaction of n-butylbenzoate with phenyl-pchlorobenzoate. The effect of the electronic structure of the metal on the catalytic activity of the coronates of lanthanum, cerium, praseodymium, neodymium

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13

Gao, Zhanyang, Min Wang, Shiyao Wang, et al. "Novel and efficient synthesis of insulating gas- heptafluoroisobutyronitrile from hexafluoropropylene." Royal Society Open Science 6, no. 3 (2019): 181751. http://dx.doi.org/10.1098/rsos.181751.

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A novel and efficient preparation route of insulating gas-heptafluoroisobutyronitrile was developed. The synthetic route involved halogen-exchange fluorination, decomposition of bis-(perfluoroisopropyl) ketone and dehydration reaction. Overall, the desired compound was produced without the use of extremely toxic and expensive substances. Structures of the as-obtained products were determined by 19 F NMR, 13 C NMR, IR and GC-MS. The effects of several variables on reaction yield including nature of potassium fluoride, the catalyst dosage, temperature, solvent and molar ratio of raw materials we

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14

Lopez-Hilfiker, F. D., K. Constantin, J. P. Kercher, and J. A. Thornton. "Temperature dependent halogen activation by N<sub>2</sub>O<sub>5</sub> reactions on halide-doped ice surfaces." Atmospheric Chemistry and Physics Discussions 12, no. 2 (2012): 6085–112. http://dx.doi.org/10.5194/acpd-12-6085-2012.

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Abstract. We examined the reaction of N2O5 on frozen halide salt solutions as a function of temperature and composition using a coated wall flow tube technique coupled to a chemical ionization mass spectrometer (CIMS). The molar yield of photo-labile halogen compounds was near unity for almost all conditions studied, with the observed reaction products being nitryl chloride (ClNO2) and/or molecular bromine (Br2). The relative yield of ClNO2 and Br2 depended on the ratio of bromide to chloride ions in the solutions used to form the ice. At a bromide to chloride ion molar ratio greater than 1/30

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15

Lübcke, P., N. Bobrowski, S. Arellano, et al. "BrO/SO<sub>2</sub> molar ratios from scanning DOAS measurements in the NOVAC network." Solid Earth 5, no. 1 (2014): 409–24. http://dx.doi.org/10.5194/se-5-409-2014.

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Abstract. The molar ratio of BrO to SO2 is, like other halogen/sulfur ratios, a possible precursor for dynamic changes in the shallow part of a volcanic system. While the predictive significance of the BrO/SO2 ratio has not been well constrained yet, it has the major advantage that this ratio can be readily measured using the remote-sensing technique differential optical absorption spectroscopy (DOAS) in the UV. While BrO/SO2 ratios have been measured during several short-term field campaigns, this article presents an algorithm that can be used to obtain long-term time series of BrO/SO2 ratios

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16

Wang, Min, Qiong Liu, and Hai Yan Luan. "Preparation, Characterization and Photocatalytic Preoperty of BiVO₄ Photocatalyst by Sol-Gel Method." Applied Mechanics and Materials 99-100 (September 2011): 1307–11. http://dx.doi.org/10.4028/www.scientific.net/amm.99-100.1307.

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Bismuth vanadate (BiVO4) powders were synthesized by complexing Sol-Gel method using citric acid as chelate,calcined at different temperature and characterized with X-ray diffraction (XRD), scanning electron microsoope（SEM）and specific surface area (BET). The photocatalytic activity was evaluated by photocatalytic degradation of methyl orange (MO) solution under visible light. It revealed that temperature values can influence significantly on the morphologies and structures of the products.It also found that the sample prepared with the molar ratio of citric acid to metal inons be 2:1, pH=7 an

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17

Bayler, Angela, Andreas Bauer, and Hubert Schmidbaur. "Chiral Phosphine Ligands in the Structural Chemistry of Gold." Zeitschrift für Naturforschung B 52, no. 12 (1997): 1477–83. http://dx.doi.org/10.1515/znb-1997-1207.

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Abstract The reaction of chloro(dimethylsulfide)gold(I) with (2-hydroxybutyl)diphenylphosphine (L) (racemic mixture) in dichloromethane affords high yields of the racemic chiral complex (L)AuCl. Metathesis reactions with KBr or KI, respectively, in a two-phase solvent mix ture (CH2CI2/H2O) lead to a conversion into the corresponding bromide and iodide complexes (L)AuBr and (L)AuI. Treatment of silver chloride with the ligand L in acetonitrile yields the analogous 1:1 adduct (L)AgCl. The compounds have been characterized by their analytical and spectroscopic data, and the structures of (L)AuCl

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18

Minyaev, Mikhail E., Alexander N. Tavtorkin, Sof'ya A. Korchagina, Galina N. Bondarenko, Andrei V. Churakov, and Ilya E. Nifant'ev. "Isomorphous rare-earth tris[bis(2,6-diisopropylphenyl) phosphate] complexes and their catalytic properties in 1,3-diene polymerization and in the inhibited oxidation of polydimethylsiloxane." Acta Crystallographica Section C Structural Chemistry 74, no. 5 (2018): 590–98. http://dx.doi.org/10.1107/s2053229618005570.

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Crystals of mononuclear tris[bis(2,6-diisopropylphenyl) phosphato-κO]pentakis(methanol-κO)lanthanide methanol monosolvates of lanthanum, [La(C24H34O4P)3(CH3OH)5]·CH3OH, (1), cerium, [Ce(C24H34O4P)3(CH3OH)5]·CH3OH, (2), and neodymium, [Nd(C24H34O4P)3(CH3OH)5]·CH3OH, (3), have been obtained by reactions between LnCl3(H2O) n (n = 6 or 7) and lithium bis(2,6-diisopropylphenyl) phosphate in a 1:3 molar ratio in methanol media. Compounds (1)–(3) crystallize in the monoclinic P21/c space group and have isomorphous crystal structures. All three bis(2,6-diisopropylphenyl) phosphate ligands display a κO

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19

Jimmyuwanta, Emaime, Pius Oziri Ukoha, Emmanuel Jimmy Ukpong, and Andatim Sunday Johnson. "Neodymium (III) and Samarium (III) Complexes of 2, 2′- ((1E, 1′E) - (1, 2- Phenylenebis(Azanlylidene) bis(Methanylylidene)) DiphenolLigand: Synthesis, Characterization and Biological Activity." Oriental Journal Of Chemistry 37, no. 3 (2021): 575–82. http://dx.doi.org/10.13005/ojc/370308.

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Complexes of Nd(III) and Sm(III) of a Schiff base ligand derived from the condensation of o-phenylenediamie and 2-hydroxybenzaldehyde were synthesised and characterised by various analytical and spectroscopic techniques. The analytical values revealed a metal to ligand ratio of 1:2 for the Nd(III) complex and a 1:1(ligand: metal) for Sm(III) complex. The complexes were characterised by elemental analysis, molar conductance, UV – Visible and infrared spectral studies. Plausible structures were proposed for Nd(BSOPD)2 and SmBSOPD based on the results obtained. In-vitro antimicrobial activities o

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20

Engering, Josef, Eva-Maria Peters, and Martin Jansen. "Synthesen und Kristallstrukturen von Bis(N-lithiumtrimethylsilylamino)- bis(dimethylamino)silan und 1,1-Dichloro-2,4-bis(trimethylsilylamino)- 3,3-bis(dimethylamino)siladiazatitanacyclobutan / Syntheses and Crystal Structures of Bis(N-lithio-trimethylsilylamino)bis(dimethylamino)- silane and 1,1-Dichloro-2,4-bis(trimethylsilylamino)-3,3-bis(dimethylamino)siladiazatitanacyclobutane." Zeitschrift für Naturforschung B 57, no. 9 (2002): 976–82. http://dx.doi.org/10.1515/znb-2002-0902.

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Bis(N-lithio-trimethylsilylamino)bis(dimethylamino)silane (1) is formed in the reaction of silicon tetrachloride with excess hexamethyldisilazane, followed by halogen substitution using two equivalents of LiN(CH3)2, and treatment with two equivalents of n-butyllithium in hexane. 1, found to be dimeric in the solid state, was characterised by single crystal X-ray diffraction (monoclinic, C2/c, a = 1925.2(4), b = 1501.7(2), c = 1389.7(3) pm, β= 101.98(2), Z = 4, C20H60Li4N8Si6), and by solid state and solution NMR spectroscopy and mass spectrometry. Further reaction with titanium tetrachloride (

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21

He, Lan Lan, Yi Zhang, Zhao Lu Qin, Yan Hua Lan, Ding Hua Li, and Rong Jie Yang. "Study on Synthesis of Cyclotriphosphazene Containing Aminopropylsilicone Functional Group as Flame Retardant." Advanced Materials Research 683 (April 2013): 25–29. http://dx.doi.org/10.4028/www.scientific.net/amr.683.25.

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A novel non-halogen flame retardant APESP, cyclotriphosphazene containing six aminopropyltriethoxysilicone functional groups N3P3[NH(CH2)3Si(OCH2CH3)3]6, was synthesized by menas of SN2 nucleophilic substitution reaction, using hexachlorocyclotriphosphazene(HCCP) and 3-aminopropyltriethoxy-silane (KH550) as material. Firstly the industrial grade HCCP was purified through recrystallization and sublimation. Then the reaction process was investigated to prompt the yield, and the optimum reaction conditions were as follows: triethylamine as acid-binding agent, tetrahydrofuran as solvent, HCCP/KH55

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22

Stricker-Lennartz, Rainer, and H. P. Latscha. "Darstellung von m- und p-Phenylen-bis(dichlorstiban)/ Synthesis of m- and p-Phenylene-bis(dichlorostibane)." Zeitschrift für Naturforschung B 40, no. 8 (1985): 1045–48. http://dx.doi.org/10.1515/znb-1985-0810.

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AbstractThe reaction of antimony(III)-chloride with lithiumdiisopropylamide in the molar ratio 1:2 in ether gives monochloro-bis(diisopropylamino)stibane (4). m -Bromophenyl-bis(diisopropylamino)stibane (2a) is prepared by reaction of m-bromophenyllithium with 4. p-Bromophenylbis(diisopropylamino)stibane (2b) can be obtained by reaction of p-brom ophenyl-dichlorostibane with lithium-diisopropylamide, or from p-brom ophenyllithium and 4. The metal-halogen-exchange of 2a, b by butyllithium in ether gives m- or p-Lithium phenyl-bis(diisopropylamino)- stibane (3a, b), respectively. Without isolati

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23

Wächtler, Erik, Alexander Kämpfe, Katrin Krupinski, et al. "New Insights into Hexacoordinated Silicon Complexes with 8- Oxyquinolinato Ligands: 1,3-Shift of Si-Bound Hydrocarbyl Substituents and the Influence of Si-Bound Halides on the 8-Oxyquinolinate Coordination Features." Zeitschrift für Naturforschung B 69, no. 11-12 (2014): 1402–18. http://dx.doi.org/10.5560/znb.2014-4170.

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Abstract The transsilylation reaction between allyltrichlorosilane and 8-trimethylsiloxyquinoline in the molar ratio 1 : 3 yields the hexacoordinated silicon tris-chelate (oxinate)2Si(adho) (“oxinate” = 8- oxyquinolinate, “adho” = di-anion of 2-allyl-1,2-dihydro-8-oxyquinoline) comprising an SiO3N3 skeleton. The identity of this complex was established by single-crystal X-ray diffraction analysis and 29Si CP=MAS NMR spectroscopy of its chloroform solvate. Benzyltrichlorosilane and dibenzyldichlorosilane, comprising benzyl (Bn) as an “aromatically stabilized allyl moiety” did not undergo such r

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24

Rüdiger, Julian, Alexandra Gutmann, Nicole Bobrowski, et al. "Halogen activation in the plume of Masaya volcano: field observations and box model investigations." Atmospheric Chemistry and Physics 21, no. 5 (2021): 3371–93. http://dx.doi.org/10.5194/acp-21-3371-2021.

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Abstract. Volcanic emissions are a source of halogens in the atmosphere. Rapid reactions convert the initially emitted hydrogen halides (HCl, HBr, and HI) into reactive species such as BrO, Br2, BrCl, ClO, OClO, and IO. The activation reaction mechanisms in the plume consume ozone (O3), which is entrained by ambient air that is mixed into the plume. In this study, we present observations of the oxidation of bromine, chlorine, and iodine during the first 11 min following emission, examining the plume from Santiago crater of the Masaya volcano in Nicaragua. Two field campaigns were conducted: on

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25

Peng, Yangfeng, Cai Feng, Sohrab Rohani, and Quan He. "Improved Resolution of 4-Chloromandelic Acid and the Effect of Chlorine Interactions Using (R)-(+)-Benzyl-1-Phenylethylamine as a Resolving Agent." Molecules 23, no. 12 (2018): 3354. http://dx.doi.org/10.3390/molecules23123354.

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In order to avoid the disadvantage of commonly used resolving agent 1-phenylethylamine (hereafter: PEA), which is soluble in water, (R)-(+)-benzyl-1-phenylethylamine ((R)-(+)-BPA) was used to resolve 4-chloromandelic acid (4-ClMA) in this study. The optimal resolution conditions were determined: absolute ethanol as a solvent, the molar ratio of 4-ClMA to (R)-(+)-BPA as 1:1, the filtration temperature as 15 °C, and the amount of solvent as 1.6 mL/1 mmol 4-ClMA. Thermophysical properties, such as melting point, heat of fusion, and solubility, exhibited significant differences between the less an

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26

Gaber, Ahmed, Arafa A. M. Belal, Ibrahim M. El-Deen, et al. "Synthesis, Spectroscopic Characterization, and Biological Activities of New Binuclear Co(II), Ni(II), Cu(II), and Zn(II) Diimine Complexes." Crystals 11, no. 3 (2021): 300. http://dx.doi.org/10.3390/cryst11030300.

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Metal-ligand complexes have attracted major interest due to their potential medical applications as anticancer agents. The work described in the current article aimed to synthesize, spectroscopic, thermal, and biological studies of some metal-diimine complexes. A diimine ligand, namely 2-{[2-(4-chlorophenyl)-2-hydroxyvinyl]-hydrazonomethyl}phenol (diim) was prepared via the reaction of p-chlorophenacyl bromide with hydrazine hydrate in ethanol, then condensation was completed with 2-hydroxybenzaldehyde in acetic acid. The Co(II), Ni(II), Cu(II), and Zn(II) complexes were prepared with a metal:

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27

Salerno, G. G., C. Oppenheimer, V. I. Tsanev, A. J. Sutton, T. J. Roberts, and T. Elias. "Enhancement of the volcanogenic "bromine explosion" via reactive nitrogen chemistry (Kīlauea volcano, Hawai'i)." Atmospheric Chemistry and Physics Discussions 10, no. 4 (2010): 10313–34. http://dx.doi.org/10.5194/acpd-10-10313-2010.

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Abstract. Since the first detection of bromine monoxide in volcanic plumes attention has focused on the atmospheric synthesis and impact of volcanogenic reactive halogens. We report here new measurements of BrO in the volcanic plume emitted from Kīlauea volcano – the first time reactive halogens have been observed in emissions from a hotspot volcano. Observations were carried out by ground-based Differential Optical Absorption Spectroscopy in 2007 and 2008 at Pu'u'O'o crater, and at the 2008 magmatic vent that opened within Halema'uma'u crater. BrO was readily detected in the Halema'uma'u plum

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28

Zalov, Ali Z., and Kiril Blazhev Gavazov. "LIQUID-LIQUID EXTRACTION-SPECTROPHOTOMETRIC DETERMINATION OF MOLYBDENUM USING o-HYDROXYTHIOPHENOLS." JOURNAL OF ADVANCES IN CHEMISTRY 10, no. 8 (2017): 3003–11. http://dx.doi.org/10.24297/jac.v10i8.6687.

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27 liquid-liquid extraction-chromogenic systems containing Mo(VI), o-hydroxythiophenol derivative {HTPDs: 2-hydroxy-5-chlorothiophenol (HCTP), 2-hydroxy-5-bromothiophenol (HBTP) or 2-hydroxy-5-iodothiophenol (HITP)} and aromatic amine (AA) were studied. Aniline (An), N-methylaniline (mAn), N,N-dimethylaniline (dAn), o-toluidine (o-Tol), m-toluidine (m-Tol), p-toluidine (p-Tol), 3,4-xylidine (o-Xyl), 2,4-xylidine (m-Xyl), and 2,5-xylidine (p-Xyl) were the examined AAs. Optimization experiments for molybdenum extraction-spectrophotometric determination were performed and the following parameters

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29

Minyaev, Mikhail E., Sof'ya A. Korchagina, Alexander N. Tavtorkin, Andrei V. Churakov, and Ilya E. Nifant'ev. "Dinuclear neodymium and lanthanum bis(2,6-diisopropylphenyl) phosphate complexes bearing a hydroxide ligand: catalytic activity of the Nd complex in 1,3-diene polymerization." Acta Crystallographica Section C Structural Chemistry 74, no. 6 (2018): 673–82. http://dx.doi.org/10.1107/s2053229618006666.

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The reactions of K[(2,6-iPr2C6H3-O)2POO] either with LaCl3(H2O)7 or with Nd(NO3)3(H2O)6 in a 3:1 molar ratio, followed by vacuum drying and recrystallization from alkanes, have led to the formation of diaquapentakis[bis(2,6-diisopropylphenyl) phosphato]-μ-hydroxido-dilanthanum hexane disolvate, [La2(C24H34O4P)5(OH)(H2O)2]·2C6H14, (1)·2(hexane), and tetraaquatetrakis[bis(2,6-diisopropylphenyl) phosphato]-μ-hydroxido-dineodymium bis(2,6-diisopropylphenyl) phosphate heptane disolvate, [Nd2(C24H34O4P)4(OH)(H2O)4]·2C6H14, (2)·2(heptane). The compounds crystalize in the P21/n and P\overline{1} space

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30

Alhodaib, Aiyeshah, Omnia Ibrahim, Suzy Abd El All, and Fatthy Ezzeldin. "Effect of Rare-Earth Ions on the Optical and PL Properties of Novel Borosilicate Glass Developed from Agricultural Waste." Materials 14, no. 19 (2021): 5607. http://dx.doi.org/10.3390/ma14195607.

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There is considerable attention devoted to the use of agricultural waste as a raw material substitute for commercial silica in the development of borosilicate glasses doped with rare earth oxides. Here, we present a novel structure for borosilicate glasses made from rice husk ash with a 25% molar ratio of extracted SiO2 and doped with neodymium (GRN) or dysprosium (GRD). Adding rare earth oxides to borosilicate glasses by the melt quenching method enhanced optical transmission due to the presence of their tetrahedral geometries. GRN samples showed few bands near zero, which constitutes good ut

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31

Fischer, Jörg, Peter Machnitzki, and Othmar Stelzer. "Chlormethylchlorphosphane mit sperrigen Substituenten -Synthese und reduktive Enthalogenierung mit Fe2(CO)9 / Bulky Chloromethylchlorophosphines -Syntheses and Reductive Dehalogenation with Fe2 (CO)9." Zeitschrift für Naturforschung B 52, no. 8 (1997): 883–94. http://dx.doi.org/10.1515/znb-1997-0801.

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Chloromethylchlorophosphines R(Cl)P-CH2-Cl (R = C6H11, sec-C4H9, 2,4,6-R′3C6H2; R′ = tBu, iPr) with bulky substituents (1a - 1d) have been prepared by treatment of Cl2P-CH2-Cl with organolithium compounds RLi (R = 2,4,6-R′3C6H2) or Grignard reagents RMgX (R = C6H11, sec-C4H9). For the less bulky phenyl derivative Ph(Cl)P-CH2-Cl (1i) a protected group two stage synthesis has been developed employing Et2N(Cl)P-CH2-Cl as an intermediate. Si-N cleavage reactions between Cl2P-CH2-Cl and R2N-SiMe3 or nucleophilic substitution with Ph2NH yield the amino derivatives R′2N(Cl)P-CH2-Cl (R′ = Ph, Et, iPr)

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32

Efimenko, Zarina M., Anton V. Rozhkov, Vitalii V. Suslonov, Maxim L. Kuznetsov, Vadim Yu Kukushkin, and Nadezhda A. Bokach. "Copper(II)-Mediated Iodination of 1-Nitroso-2-naphthol." Molecules 26, no. 18 (2021): 5708. http://dx.doi.org/10.3390/molecules26185708.

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The 3-Iodo-1-nitrosonaphthalene-2-ol (I-NON) was obtained by the copper(II)-mediated iodination of 1-nitroso-2-naphthol (NON). The suitable reactants and optimized reaction conditions, providing 94% NMR yield of I-NON, included the usage of Cu(OAc)2·H2O and 1:2:8 CuII/NON/I2 molar ratio between the reactants. The obtained I-NON was characterized by elemental analyses (C, H, N), high-resolution ESI+-MS, 1H and 13C{1H} NMR, FTIR, UV-vis spectroscopy, TGA, and X-ray crystallography (XRD). The copper(II) complexes bearing deprotonated I-NON were prepared as follows: cis-[Cu(I-NON–H)(I-NON)](I3) (1

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Gessmann, Renate, Hans Brückner, Albrecht Berg, and Kyriacos Petratos. "The crystal structure of the lipoaminopeptaibol helioferin, an antibiotic peptide fromMycogone rosea." Acta Crystallographica Section D Structural Biology 74, no. 4 (2018): 315–20. http://dx.doi.org/10.1107/s2059798318001857.

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The crystal structure of the natural nonapeptide antibiotic helioferin has been determined and refined to 0.9 Å resolution. Helioferin consists of helioferin A and B, which contain 2-(2′-aminopropyl)aminoethanol (Apae) and 2-[(2′-aminopropyl)methylamino]ethanol (Amae) at their respective alkanolamine termini. In addition, helioferin contains the unusual amino-acid residues α-aminoisobutyric acid (Aib) and (2S,4S,6S)-2-amino-6-hydroxy-4-methyl-8-oxodecanoic acid (Ahmod). The amino-terminus is capped with 2-methyl-n-1-octanoic acid (M8a). The peptide crystallizes with a 1:1 molar ratio of heliof

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Sivalingam, Jagath Retchahan, Fai Kait Chong, and Cecilia Devi Wilfred. "CeO2-TiO2 Photocatalyst: Ionic Liquid-Mediated Synthesis, Characterization, and Performance for Diisopropanolamine Visible Light Degradation." Bulletin of Chemical Reaction Engineering & Catalysis 13, no. 1 (2018): 170. http://dx.doi.org/10.9767/bcrec.13.1.1396.170-178.

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CeO2-TiO2 photocatalyst with Ce:Ti molar ratio of 1:9 was synthesized via co-precipitation method in the presence of 1-ethyl-3-methyl imidazolium octylsulfate, [EMIM][OctSO4] (CeO2-TiO2-IL). The ionic liquid acts as a templating agent for particle growth. The CeO2-TiO2 and TiO2 photocatalysts were also synthesized without any ionic liquid for comparison. Calcination was conducted on the as-synthesized materials at 400˚C for 2 h. The photocatalysts were characterized using diffuse reflectance UV-Vis spectroscopy (DR-UV-Vis), field emission scanning electron microscopy (FESEM), X-ray powder diff

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Nah, Theodora, Junwei Yang, Jian Wang, Amy P. Sullivan, and Rodney J. Weber. "Fine Aerosol Acidity and Water during Summer in the Eastern North Atlantic." Atmosphere 12, no. 8 (2021): 1040. http://dx.doi.org/10.3390/atmos12081040.

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Aerosol pH governs many important atmospheric processes that occur in the marine boundary layer, including regulating halogen and sulfur chemistries, and nutrient fertilization of surface ocean waters. In this study, we investigated the acidity of PM1 over the eastern North Atlantic during the Aerosol and Cloud Experiments in Eastern North Atlantic (ACE-ENA) aircraft campaign. The ISORROPIA-II thermodynamic model was used to predict PM1 pH and water. We first investigated the sensitivities of PM1 pH and water predictions to gas-phase NH3 and HNO3 concentrations. Our sensitivity analysis indica

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Anyfanti, Goulielmina, Antonio Bauzá, Lorenzo Gentiluomo, et al. "Short X···N Halogen Bonds With Hexamethylenetetraamine as the Acceptor." Frontiers in Chemistry 9 (April 29, 2021). http://dx.doi.org/10.3389/fchem.2021.623595.

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Hexamethylenetetramine (HMTA) and N-haloimides form two types of short (imide)X···N and X–X···N (X = Br, I) halogen bonds. Nucleophilic substitution or ligand-exchange reaction on the peripheral X of X–X···N with the chloride of N-chlorosuccinimide lead to Cl–X···N halogen-bonded complexes. The 1:1 complexation of HMTA and ICl manifests the shortest I···N halogen bond [2.272(5) Å] yet reported for an HMTA acceptor. Two halogen-bonded organic frameworks are prepared using 1:4 molar ratio of HMTA and N-bromosuccinimide, each with a distinct channel shape, one possessing oval and the other square

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Twomey, Conor J., and Shaw H. Chen. "Solid Polymers Doped with Neodymium. Complex Formation and Morphology in NdCl3 and Nd(DPM)3-Poly(Ethylene Oxide) Systems." MRS Proceedings 210 (1990). http://dx.doi.org/10.1557/proc-210-279.

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AbstractThe complex formation and morphology of the NdCI3—PEO system are presented together with some preliminary results on the Nd(DPM)3 \Nd—tris—2,2,6,6—tetramethyl —3,5—heptane dionate]—PEO system. Although the NdCl3—PEO complex is found to be highly hygroscopic, it is shown that residual moisture can be removed reversibly, thereby permitting the role of water in affecting the morphology of the solid to be examined. It is concluded that complexation is a competitive process between the ether oxygens on the polymer backbone and water. Under anhydrous conditions the resultant complex is amorp

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