scholarly journals Crystal Structure, Spectroscopy and Photocatalytic Properties of a Co(II) Complex Based on 5-(1,2,4-triazol-1-yl)pyridine-3-carboxylic Acid

Crystals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 98
Author(s):  
Dawei Wang ◽  
Ning Zhao ◽  
Tao Wang ◽  
Changfu Zhuang ◽  
Ying Wang ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Room Temperature ◽  
Uv Light ◽  
Degradation Process ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order ◽  
Hydrogen Bonding Interactions ◽  
Intermolecular Contacts

A novel cobalt(II) complex, namely [Co(tpa)2(H2O)4]·2H2O (1) (Htpa = 5-(1,2,4-triazol-1-yl)pyridine-3-carboxylic acid) has been solvothermally synthesized and structurally characterized by single-crystal X-ray diffraction. Complex 1 was further characterized by elemental analysis, FTIR spectrum, electronic spectrum, X-ray powder diffraction and thermal gravimetric analysis. Structural analysis shows that complex 1 was stabilized via π···π stacking and hydrogen bonding interactions to give a 3D supramolecular framework. Hirshfeld surface analysis showed that O···H (29.5%), H···H (23.8%), N···H (21.5%) and π···π (8.6%) intermolecular contacts are the most important interactions in the crystal of 1. In addition, the synthesized Co(II) complex showed favorable photocatalytic activity for the degradation of methyl orange (MO) under UV light at room temperature. The degradation process of MO was in accordance with the first-order reaction kinetics, and the t1/2 for the reaction is 27.3 min, and the apparent rate constant is k = 2.54 × 10−2 min−1.

ROOM TEMPERATURE PHOTOLUMINESCENCE OF POLYCRYSTALLINE SIC PREPARED FROM CARBON-SATURATED SI MELT

2002 ◽  
Vol 16 (06n07) ◽  
pp. 1047-1051
Author(s):  
JIANPING MA ◽  
ZHIMING CHEN ◽  
GANG LU ◽  
MINGBIN YU ◽  
LIANMAO HANG ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Uv Light ◽  
X Ray Diffraction ◽  
X Ray ◽  
Room Temperature Photoluminescence ◽  
Composition And Structure ◽  
Light Excitation ◽  
Scanning Electron

Intense photoluminescence (PL) has been observed at room temperature from the polycrystalline SiC samples prepared from carbon-saturated Si melt at a temperature ranging from 1500 to 1650°C. Composition and structure of the samples have been confirmed by means of X-ray photoelectron spectroscopy, X-ray diffraction and scanning electron microscopy. PL measurements with 325 nm UV light excitation revealed that the room temperature PL spectrum of the samples consists of 3 luminescent bands, the peak energies of which are 2.38 eV, 2.77 eV and 3.06 eV, respectively. The 2.38 eV band is much stronger than the others. It is suggested that some extrinsic PL mechanisms associated with defect or interface states would be responsible to the intensive PL observed at room temperature.

Thermal and Chemical Stability of Micron Aluminum Powders Subjected to Gaseous Water

2016 ◽  
Vol 712 ◽  
pp. 241-245
Author(s):  
Sergey V. Zmanovskiy ◽  
Alexander M. Gromov ◽  
Valentina V. Smirnova ◽  
Vadim F. Petrunin ◽  
Jin Chun Kim
Keyword(s):  
Room Temperature ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Aluminum Powders ◽  
X Ray ◽  
The Stability ◽  
Heating Up ◽  
The Impact ◽  
Thermal And Chemical Stability ◽  
Composition Of Products

The paper studies the impact of gaseous water on the stability of micron aluminum powders in time at room temperature using the method of gravimetric analysis. The stability was studied using methods of thermal analysis during heating up to 1200 °С in air. The composition of products was analyzed using X-ray diffraction analysis. It was found out that the stability of micron aluminum powders depends on partial pressure of water vapor: the increase of pressure results in decreased stability of powders. The work gives recommendations for storing micron aluminum powders.

Molecular Cocrystals of Carboxylic Acids. XXXIII The Crystal Structure of the 1 : 1 Adduct of Indole-2-carboxylic Acid with 5-Nitroquinoline

1998 ◽  
Vol 51 (9) ◽  
pp. 813 ◽  
Author(s):  
Daniel E. Lynch ◽  
Niraj Mistry ◽  
Graham Smith ◽  
Karl A. Byriel ◽  
Colin H. L. Kennard
Keyword(s):  
Carboxylic Acid ◽  
Optical Signal ◽  
Optical Quality ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydrogen Bonding Interactions ◽  
Non Linear ◽  
Linear Optical ◽  
Optical Applications ◽  
Indole 3 Acetic Acid

The molecular adducts of indole-3-acetic acid (iaa) and indole-2-carboxylic acid (ica) with 5-nitroquinoline (nq), [(iaa)(nq)2] (1) and [(ica)(nq)] (2), have been prepared and characterized by X-ray diffraction and spectroscopic methods. Both examples involve charge transfer as well as a network of hydrogen-bonding interactions. Thin films of compound (2), and other similar adduct complexes of ica, can be prepared by thermal evaporation techniques and in this form exhibit a weak second-order non-linear optical signal. However, these films display poor optical quality and, without improvement, are not suitable for any potential non-linear optical applications.

scholarly journals The modulated low-temperature structure of malayaite, CaSnOSiO4

2020 ◽  
Vol 76 (3) ◽  
pp. 316-321
Author(s):  
Thomas Malcherek ◽  
Bianca Paulenz ◽  
Michael Fischer ◽  
Carsten Paulmann
Keyword(s):  
Crystal Structure ◽  
Density Functional ◽  
Room Temperature ◽  
Phonon Dispersion ◽  
Temperature Structure ◽  
X Ray Diffraction ◽  
Static Displacement ◽  
X Ray ◽  
First Order ◽  
Density Functional Perturbation Theory

The crystal structure of the mineral malayaite has been studied by single-crystal X-ray diffraction at a temperature of 20 K and by calculation of its phonon dispersion using density functional perturbation theory. The X-ray diffraction data show first-order satellite diffraction maxima at positions q = 0.2606 (8)b*, that are absent at room temperature. The computed phonon dispersion indicates unstable modes associated with dynamic displacements of the Ca atoms. The largest-frequency modulus of these phonon instabilities is located close to a wavevector of q = 0.3b*. These results indicate that the malayaite crystal structure is incommensurately modulated by static displacement of the Ca atoms at low temperatures, caused by the softening of an optic phonon with Bg symmetry.

UV Photocatalytic Digestion Utilizing TiO2 Nano-Fiber for the Determination of Total Phosphorus

2015 ◽  
Vol 645-646 ◽  
pp. 375-380
Author(s):  
Qiang Zhang ◽  
Jian Hua Tong ◽  
Chao Bian ◽  
Shan Hong Xia
Keyword(s):  
Total Phosphorus ◽  
Room Temperature ◽  
Sodium Tripolyphosphate ◽  
Uv Light ◽  
X Ray Diffraction ◽  
Muffle Furnace ◽  
Digestion Rate ◽  
X Ray ◽  
Nano Fiber

This paper describes the fabrication, characterization and the application of the photocatalytic TiO2nanofiber as the photocatalyst for the digestion of total phosphorus (TP). The nanoTiO2fibers were fabricated by the electro-spinning technique on silicon substrate. Under the conditions of room temperature (25 degrees Celsius) and humidity less than 40%, the TiO2fabricated by the electro-spinning presents a silky coagulation appearance, which can be converted to the nanofiber appearance by annealed in the muffle furnace at 450 degrees Celsius for 10 hours. X-ray diffraction (XRD) examination shows that the silky coagulation can be converted to anatase-type TiO2. The absorbance values of different phosphate concentrations after exposure in UV light at the intensity of 7000μW/cm2were tested in this paper. Sodium tripolyphosphate solutions serve as the water sample of TP, and five standard concentrations (by weight of P) are 0.0mg/L, 1.0mg/L, 2.0mg/L,3.0mg/L and 4.0mg/L, respectively. The digestion rate exhibits satisfied linearity ranges from 0.0mg/L to 4.0mg/L with acceptable linearity R2of calibration curve, in both digestion temperature of 25 degrees Celsius and 50 degrees Celsius.

Synthesis and Characterization of Superparamagnetic Fe3O4 Nanoparticles

2013 ◽  
Vol 750-752 ◽  
pp. 340-343 ◽  
Author(s):  
De Hui Sun ◽  
Jiao Wu ◽  
Ji Lin Zhang
Keyword(s):  
Room Temperature ◽  
Thermal Method ◽  
Gravimetric Analysis ◽  
X Ray Diffraction ◽  
Reaction Conditions ◽  
Xrd Pattern ◽  
X Ray ◽  
Magnetic Investigation ◽  
Average Size

We synthesized Fe3O4 nanoparticles using a solvent thermal method and characterized the morphologies, structures, surface properties, thermal stability and magnetism of the products by Field emission scanning electron microscopy (FE-SEM), Powder X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA) and vibrating sample magnetometer (VSM). The experimental results showed that the Fe3O4 nanoparticles have a tunable average size range from 55 nm to 85 nm. Their diameters decreased with increase of precursor FeCl24H2O concentration or increase of the reaction time under other reaction conditions held constant. The XRD pattern confirmed that the Fe3O4 nanoparticles belong to cubic structure. Magnetic investigation reveals that the Fe3O4 nanoparticles have higher saturation magnetization and negligible coercivity at room temperature.

Photocatalytic Activity of W Doped Ta2O5 Particles for Methylene Blue Degradation under UV-Light

2011 ◽  
Vol 197-198 ◽  
pp. 281-284 ◽  
Author(s):  
Yan Hong Zhao ◽  
Li Chun Hou ◽  
Xiang Li ◽  
Xiaodong Yang ◽  
Xiao Jing Wang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Uv Light ◽  
Tantalum Oxide ◽  
X Ray Diffraction ◽  
Orthorhombic Crystal ◽  
Methylene Blue Degradation ◽  
X Ray ◽  
First Order ◽  
Kinetics Of

Tungsten doped tantalum oxide (W-Ta2O5) particles were synthesized by a low temperature hydrothermal method. The phase structure of W-Ta2O5particles was characterized by X-ray diffraction (XRD). The XRD results indicated that the samples belonged to orthorhombic crystal. The photocatalytic activity of samples was investigated with degradation methylene blue (MB) under ultraviolet light. The degradation efficiency of MB under the catalysis of W-Ta2O5particles attained 91% when the reaction time was 7 h. The kinetics of MB degradation was respect to the first-order in the presence of the photocatalysts.

Syntheses, Crystal Structures and Luminescence of Two Coordination Polymers Based on Isophthalic Acid and 2-(3-Pyridyl)benzimidazole Ligands

2011 ◽  
Vol 399-401 ◽  
pp. 896-899
Author(s):  
Ke Fen Yue ◽  
Shuang Zhao ◽  
Rui Li Zhao ◽  
Yao Yu Wang
Keyword(s):  
Coordination Polymers ◽  
Room Temperature ◽  
Luminescent Properties ◽  
Isophthalic Acid ◽  
Stacking Interactions ◽  
X Ray Diffraction ◽  
Hydrothermal Conditions ◽  
X Ray ◽  
Hydrogen Bonding Interactions ◽  
3D Network

Two new coordination polymers, [Zn(PyHBIm)2(IPA)]•3H2O (1), [Cd(PyHBIm)(IPA)(H2O)2]•2H2O (2), were synthesized under hydrothermal conditions based on 2-(3-pyridyl)benzimidazole (3-PyHBIm) and isophthalic acid (IPA). The complexes were characterized by single crystal X-ray diffraction. They contain simple 1D chains and can be assembled into a 3D network through aromatic π–π stacking interactions and hydrogen bonding interactions. Their luminescent properties were studied in the solid state at room temperature.

scholarly journals Photocatalytic Performance of TiO2 Nanofibers as a Function of Fiber Diameter Using TiCl2 as a Precursor

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Ali Akbar Ashkarran ◽  
Sima Eshghi ◽  
Mohammad Reza Nourani
Keyword(s):  
Room Temperature ◽  
Photocatalytic Performance ◽  
Fiber Diameter ◽  
Uv Light ◽  
Separation Distance ◽  
X Ray Diffraction ◽  
Electrospinning Technique ◽  
Tio2 Nanofibers ◽  
X Ray ◽  
Uv Light Irradiation

We focus on the production of TiO2 nanofibers with controllable diameters using a facile electrospinning technique at room temperature. The resulting nanofibers were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and ultraviolet-visible spectroscopy (UV-Vis). The most important electrospinning parameters including potential difference (kV), flow rate (mL/h), and the separation distance between electrodes (cm) were found to have significant influence on the diameter of the produced nanofibers. The photocatalytic performance of TiO2 nanofibers was successfully demonstrated for decolorization of Rhodamine B (Rh.B) under UV light irradiation. It was found that fiber diameter has a crucial influence on the photocatalytic performance of TiO2 nanofibers.

Preparation and Photocatalytic Study of Nano Cadmium Sulphide

2012 ◽  
Vol 584 ◽  
pp. 406-410 ◽  
Author(s):  
S. Ershadul Haque ◽  
B. Ramdas ◽  
A. Sheela
Keyword(s):  
Photocatalytic Activity ◽  
Room Temperature ◽  
Diffuse Reflectance ◽  
Uv Light ◽  
Cadmium Sulphide ◽  
Spectroscopic Techniques ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Sunlight Irradiation ◽  
X Ray

Nano CdS has been prepared by solid state method at room temperature in the absence of any surfactants or dopants. It is characterized by powder X-ray diffraction, scanning electron microscopy (SEM) and diffuse reflectance spectroscopic techniques. It shows cubic structure with the particle size ranging about 20nm. It also exhibits a strong photocatalytic activity for the decomposition of methyl orange (MO) and rhodamine B (RB) under UV and sunlight irradiation. The result shows that CdS exerts greater photocatalytic activity for MO (83%) and RB (73%) under sunlight than UV light.

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