X-ray structure of 4-aminopyridinium-oxalate-oxalic acid-hydrate (1/1/0.5/0.5) and its characterization

Commercial escitalopram oxalate crystallizes as a hydrated adduct with oxalic acid, in the space group P21 with a = 8.029897(21), b = 25.09397(6), c = 11.138930(31) Å, β = 106.7759(2)°, V = 2148.992(7) Å3, and Z = 4. The agreement of the Rietveld and previous single-crystal structures is excellent; the root-mean-square Cartesian displacements of the non-H atoms of the two independent cations are 0.076 and 0.067 Å, respectively. The water molecule refined to a slightly different position and occupancy. The pattern is included in the Powder Diffraction File™ (PDF®) as entry 00-064-1507.

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Study on a Novel Structure of Zn Phenanthroline Malic Acid Hydrate, [Zn (C12H8N2)(C4H4O5)(H2O)](H2O)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.739.26 ◽

2013 ◽

Vol 739 ◽

pp. 26-29

Author(s):

Hai Xing Liu ◽

Jing Zhong Xiao ◽

Huan Mei Guo ◽

Qing Hua Zhang ◽

Zhang Xue Yu ◽

...

Keyword(s):

Crystal Structure ◽

Malic Acid ◽

Hydrothermal Reaction ◽

Crystal Packing ◽

X Ray Diffraction ◽

Acid Anion ◽

X Ray ◽

Hydrogen Bonding Interactions ◽

Novel Structure ◽

Acid Hydrate

A novel Zn complex [Zn (C12H8N2)(C4H4O5)(H2O)](H2O) has been synthesized from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Zn atom is six-coordinated by two phenanthroline N atoms, three O atoms from malic acid anion and one O atom from water. The crystal packing is stabilized by O-H...O hydrogen bonding interactions.

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Synthesis of Amorphous Zirconium Dioxide from Zirconyl Nitrate in Presence of Oxalic Acid

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.316.127 ◽

2021 ◽

Vol 316 ◽

pp. 127-133

Author(s):

Yuriy Velyaev ◽

Ilona Kometiani ◽

Olga Miroshnichenko

Keyword(s):

Oxalic Acid ◽

Zirconium Dioxide ◽

Spherical Particles ◽

Degree Of Crystallinity ◽

Optimum Temperature ◽

Sorbed Water ◽

Zirconyl Nitrate ◽

X Ray ◽

Low Degree ◽

Gel Drying

The article presents the results of studies on preparation of amorphous zirconium dioxide from zirconium nitrate by its hydrolysis in the presence of oxalic acid. It is determined that the balance of reagents taken for synthesis (1 ml 0,025 M ZrO(NO3)2 is 1.35 ml 4 M HOOC-COOH), and the optimum temperature of the received gel drying, which is 230 ̊С, is established, too. Morphology of the obtained ZrO2 samples was explored. It has been found that the calcining temperature is independent of the size and shape forming irregular agglomerates, consisting of smaller spherical particles, whose diameter varies between 50 and 300 nm. The X-ray analysis of the sample is represented, which showed a low degree of crystallinity of the substance. IR spectroscopy data showed the presence of zirconium dioxide-characteristic peaks on the IR spectrum. The same spectrum reflects the presence of a large amount of sorbed water in the obtained sample, as well as peaks characteristic of the gas adsorbed by the sample from the environment.

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Synthesis and Structure of Titania Nanotubes For Hydrogen Generation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.741.84 ◽

2013 ◽

Vol 741 ◽

pp. 84-89 ◽

Cited By ~ 5

Author(s):

Sangworn Wantawee ◽

Pacharee Krongkitsiri ◽

Tippawan Saipin ◽

Buagun Samran ◽

Udom Tipparach

Keyword(s):

Oxalic Acid ◽

Hydrogen Generation ◽

Ammonium Fluoride ◽

Photocurrent Density ◽

Sodium Sulphate ◽

Titania Nanotubes ◽

X Ray Diffraction ◽

X Ray ◽

Dc Power ◽

Anodic Voltage

Titania nanotubes (TiO2NTs) working electrodes for hydrogen production by photoelectrocatalytic water splitting were synthesized by means of anodization method. The electrolytes were the mixtures of oxalic acid (H2C2O4), ammonium fluoride (NH4F), and sodium sulphate (VI) (Na2SO4) with different pHs. A constant dc power supply at 20 V was used as anodic voltage. The samples were annealed at 450 °C for 2 hrs. Scanning Electron Microscopy (SEM) and X-ray diffraction (XRD) were used to characterized TiO2NTs microstructure. TiO2NTs with diameter of 100 nm were obtained when pH 3 electrolyte consisting of 0.08 M oxalic acid, 0.5 wt% NH4F, and 1.0 wt% Na2SO4was used. Without external applied potential, the maximum photocurrent density was 2.8 mA/cm2under illumination of 100 mW/cm2. Hydrogen was generated at an overall photoconversion efficiency of 3.4 %.

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UV and Solar Light Induced Natural Iron Oxide Activation: Characterization and Photocatalytic Degradation of Organic Compounds

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2018-0027 ◽

2018 ◽

Vol 17 (1) ◽

Cited By ~ 1

Author(s):

S. Belaidi ◽

L. Mammeri ◽

H. Mechakra ◽

W. Remache ◽

K. Benhamouda ◽

...

Keyword(s):

Iron Oxide ◽

Oxalic Acid ◽

Photocatalytic Oxidation ◽

Diffuse Reflectance Spectroscopy ◽

Solar Irradiation ◽

Point Of Zero Charge ◽

Natural Mineral ◽

X Ray ◽

North East ◽

Natural Iron

Abstract In this study we demonstrate the efficiency of a natural mineral as a photocalyst. This natural mineral was provided from the iron ore deposit from Chaabet-El-Ballout which is located in North-East of Algeria. The characterization analysis of the mineral by the Energy-dispersive X-ray spectroscopy (EDX) revealed that the natural powder has a mixed elemental composition and consist mainly of iron oxide with 50 % of iron. In order to determine the crystal phase composition of the natural iron oxide (NIO), X-ray diffraction (DRX) measurement and infrared absorption spectroscopy (FTIR) were carried out. The results showed that the NIO has a mixed crystal structure composed mainly of hematite and lesser extent of goethite. The specific surface area and the total pore volume of the NIO were 79.015 m2g−1 and 0.0892 cm3g−1 respectively, measured by the Brunauer Emmett–Teller method (BET). The Raman spectrum of the NIO confirmed that the sample has seven characteristic peaks attributable to hematite. The optical properties of soil powder were examined by UV-vis diffuse reflectance spectroscopy (DRS). The pH of point of zero charge (pHpzc) of the adsorbent was determined, a value of 8.3 was found. The photocatalytic activity of the NIO particles was tested by the decomposition of aqueous solution of different class of compounds; phenolic compounds, pesticides and dyes due to their presence in many types of wastewaters. The sorption on the surface of the NIO with photocatalytic oxidation using oxalic acid and hydrogen peroxide would be an effective oxidation process for the removal of contaminants under UV and solar irradiation. High percentages of degradation of 1- Naphtol (1-NP) and Linuron were found about, 94.6 %, 97.2 % respectively, in presence of NIO and H2O2 under UV irradiation. The presence of oxalic acid with NIO enhanced the photodegradation of 2,6-dimethylphenol (2,6-DMP), 2-chlorophenol (2-CP) and Methylene blue (MB) with 72 %, 92 % and 100 % percentages of degradation respectively.

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Preparation of pod-shaped TiO 2 and Ag@TiO 2 nano burst tubes and their photocatalytic activity

Royal Society Open Science ◽

10.1098/rsos.191019 ◽

2019 ◽

Vol 6 (9) ◽

pp. 191019 ◽

Cited By ~ 2

Author(s):

Shang Wang ◽

Zhaolian Han ◽

Tingting Di ◽

Rui Li ◽

Siyuan Liu ◽

...

Keyword(s):

Electron Microscopy ◽

Photocatalytic Activity ◽

Oxalic Acid ◽

Ultraviolet Light ◽

Photoelectron Spectroscopy ◽

Degradation Process ◽

Catalytic Performance ◽

Tetrabutyl Titanate ◽

Order Kinetic ◽

X Ray

The pod-shaped TiO 2 nano burst tubes (TiO 2 NBTs) were prepared by the combination of electrospinning and impregnation calcination with oxalic acid (H 2 C 2 O 4 ), polystyrene (PS) and tetrabutyl titanate. The silver nanoparticles (AgNPs) were loaded onto the surface of TiO 2 NBTs by ultraviolet light reduction method to prepare pod-shaped Ag@TiO 2 NBTs. In this work, we analysed the effect of the amount of oxalic acid on the cracking degree of TiO 2 NBTs; the effect of the concentration of AgNO 3 solution on the particle size and loading of AgNPs on the surface of TiO 2 NBTs. Scanning electron microscopy and transmission electron microscopy investigated the surface morphology of samples. X-ray diffraction and X-ray photoelectron spectroscopy characterized the structure and composition of samples. Rhodamine B (RhB) solution was used to evaluate the photocatalytic activity of pod-shaped TiO 2 NBTs and Ag@TiO 2 NBTs. The results showed that TiO 2 NBTs degraded 91.0% of RhB under ultraviolet light, Ag@TiO 2 NBTs degraded 95.5% under visible light for 75 and 60 min, respectively. The degradation process of both samples was consistent with the Langmuir–Hinshelwood first-order kinetic equation. Therefore, the catalytic performance of the sample is: Ag@TiO 2 NBTs > TiO 2 NBTs > TiO 2 nanotubes.

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404. The structure of the carboxyl group. A quantitative investigation of oxalic acid dihydrate by Fourier synthesis from the X-ray crystal data

Journal of the Chemical Society (Resumed) ◽

10.1039/jr9360001817 ◽

1936 ◽

pp. 1817 ◽

Cited By ~ 29

Author(s):

J. Monteath Robertson ◽

Ida Woodward

Keyword(s):

Oxalic Acid ◽

Carboxyl Group ◽

Crystal Data ◽

Fourier Synthesis ◽

Quantitative Investigation ◽

X Ray ◽

Oxalic Acid Dihydrate ◽

Group A

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Oxalic Acid as a Hydrogen Donor for the Hydrodesulfurization of Gas Oil and Deoxygenation of Rapeseed Oil Using Phonolite-Based Catalysts

Molecules ◽

10.3390/molecules25163732 ◽

2020 ◽

Vol 25 (16) ◽

pp. 3732

Author(s):

José Miguel Hidalgo Herrador ◽

Jakub Fratczak ◽

Zdeněk Tišler ◽

Hector de Paz Carmona ◽

Romana Velvarská

Keyword(s):

Oxalic Acid ◽

Rapeseed Oil ◽

Fossil Fuels ◽

Raw Materials ◽

Hydrogen Donor ◽

Gas Oil ◽

X Ray Diffraction ◽

X Ray ◽

Hydrogen Donors ◽

Temperature Programmed

The use of renewable local raw materials to produce fuels is an important step toward optimal environmentally friendly energy consumption. In addition, the use of these sources together with fossil fuels paves the way to an easier transition from fossil to renewable fuels. The use of simple organic acids as hydrogen donors is another alternative way to produce fuel. The present work reports the use of oxalic acid as a hydrogen donor for the catalytic hydrodesulfurization of atmospheric gas oil and the deoxygenation of rapeseed oil at 350 °C. For this process, one commercial NiW/SiO2–Al2O3 solid and two NiW/modified phonolite catalysts were used, namely Ni (5%) W (10%)/phonolite treated with HCl, and Ni (5%) W (10%)/phonolite treated with oxalic acid. The fresh phonolite catalysts were characterized by Hg porosimetry and N2 physisorption, ammonia temperature programmed desorption (NH3-TPD), X-ray diffraction (XRD), and X-ray fluorescence (XRF). The sulfided metal phonolite catalysts were characterized by XRD and XRF. Hydrodesulfurization led to a decrease in sulfur content from 1 to 0.5 wt% for the phonolite catalysts and to 0.8 wt% when the commercial catalyst was used. Deoxygenation led to the production of 15 and 65 wt% paraffin for phonolite and commercial solids, respectively. The results demonstrate the potential of using oxalic acid as a hydrogen donor in hydrotreating reactions.

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Synthesis of Glycolic and Oxalic Acid Europium: [Eu (C3 H6O9)] ·2(H2O)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.554-556.792 ◽

2012 ◽

Vol 554-556 ◽

pp. 792-795

Author(s):

Hai Xing Liu ◽

Jing Wang ◽

Fang Fang Jian ◽

Hui Juan Yue ◽

Guang Zeng ◽

...

Keyword(s):

Crystal Structure ◽

Hydrogen Bonding ◽

Oxalic Acid ◽

Single Crystal ◽

Hydrothermal Reaction ◽

X Ray Diffraction ◽

X Ray ◽

Hydrogen Bonding Interactions ◽

The Eu

A new Eu complex [Eu (C3O9H6)] ·2(H2O) has been synthesized from a hydrothermal reaction and the crystal structure has been determined by means of single-crystal X-ray diffraction. The Eu atom is coordinated by eight O atoms. The molecular is antisymmetric structure by the C3-C3 axis. It is striking that the structure of the complex exhibits extensive O-H…O hydrogen-bonding interactions.

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