Zeolite-encapsulated Mn(II) Complex: A New Nano Catalyst for the Synthesis of Modafinil and Its Derivatives

2019 ◽  
Vol 16 (7) ◽  
pp. 541-549 ◽  
Author(s):  
Mohammad Javad Taghizadeh ◽  
Huoman Karimi ◽  
Akbar Mirzaie
Keyword(s):  
Thermal Analysis ◽  
Schiff Base ◽  
Spectroscopic Analysis ◽  
Zeolite Y ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectroscopic Analysis ◽  
Nano Catalyst ◽  
N2 Sorption

The Mn-hydrazone Schiff base encapsulated into NaY has been prepared and characterized as a new heterogeneous catalyst. Elemental analysis, UV-Vis, infrared spectroscopic analysis, diffused reflectance spectroscopy, thermal analysis, small angle X-ray diffraction, and N2 sorption demonstrate the existence of Mn-hydrazone schiff base in the nanopores of zeolite-Y. MnII(Hsal- hrz)/Y, which showed excellent catalytic property in oxidation with various sulfide compounds including important drugs such as adrafinil and modafinil, using hydroperoxide-urea (UHP) as oxidant. Thioanisole conversion was high (98%).

Structural and Optical Characterization of ZnO and Glucose Capped ZnO Nanoparticles

2018 ◽  
Vol 21 (1) ◽  
pp. 001-005 ◽  
Author(s):  
A. Dhanalakshmi ◽  
S. Thanikaikarasan ◽  
B. Natarajan ◽  
V. Ramadas ◽  
T. Mahalingam ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Spectroscopic Analysis ◽  
Optical Characterization ◽  
Hexagonal Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectroscopic Analysis ◽  
Structure Surface ◽  
Chemical Reaction Method

Zinc Oxide and Glucose capped Zinc Oxide nanoparticles have been prepared using modified chemical reaction method. X-ray diffraction analysis showed that the prepared samples possess polycrystalline nature with hexagonal structure. Surface morphology has been analyzed using scanning electron microscopy. The estimated value of band gap was found to be 3.41 and 3.87 eV for Zinc Oxide and Glucose capped ZnO respectively. Fourier Transform Infrared spectroscopic analysis has been carried out to find the chemical bond and elemental composition present in Zinc Oxide and Glucose capped Zinc Oxide.

Influence of Heat Treatment on the Structure and Performance of ATP and its Catalyzer

2011 ◽  
Vol 295-297 ◽  
pp. 1510-1515 ◽  
Author(s):  
Yue Bin Lin ◽  
Chun Bo Li ◽  
Yu Fu Zhu ◽  
Ai Hui Liu
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Spectroscopic Analysis ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Treatment Conditions ◽  
Transmission Electron ◽  
Crystal Transition ◽  
And Performance

Taking Attapulgite Clay(ATP) as a carrier, TiO2/ATP precursor was prepared by acid sol-gel method, and then made its composite under different heat-treatment conditions. The structures, dimensions, compositions of the composite are characterized by X-Ray diffraction, transmission electron microscope, thermogravimetric-differential thermal analysis and spectroscopic analysis measurements, respectively. the results show that TiO2/ATP composite increase the crystal transition temperature of TiO2, rutile TiO2emerge in the composite until 800°C, ATP lost its layer constructure and collapse at 850°C.

scholarly journals Influence of OH−Ion Concentration on the Surface Morphology of ZnO-SiO2Nanostructure

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Jessica Ven G. Tinio ◽  
Key T. Simfroso ◽  
Amber Dea Marie V. Peguit ◽  
Rolando T. Candidato
Keyword(s):  
Electron Microscopy ◽  
Surface Morphology ◽  
Spectroscopic Analysis ◽  
Ion Concentration ◽  
X Ray Diffraction ◽  
Remarkable Change ◽  
X Ray ◽  
Infrared Spectroscopic Analysis ◽  
Surface Capping ◽  
Scanning Electron

The influence of varying OH−ion concentration on the surface morphology of chemically deposited ZnO-SiO2nanostructures on glass substrate was investigated. The morphological features, phase structure, and infrared characteristics were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR), respectively. Results revealed that silica significantly changes the hexagonal morphology of bare ZnO rod to “pointed tips” when using low initial OH−precursor concentration. Increasing OH−ion concentration resulted in a “flower-like” formation of ZnO-SiO2and a remarkable change from “pointed tips” to “hemispherical tips” at the top surface of the rods. The surface capping of SiO2to ZnO leads to the formation of these “hemispherical tips.” The infrared spectroscopic analysis showed the characteristics peaks of ZnO and SiO2as well as the Si-O-Zn band which confirms the formation of ZnO-SiO2. Phase analysis manifested that the formed ZnO-SiO2is of wurtzite structure. Furthermore, a possible growth mechanism is proposed based on the obtained results.

A new acrylamide- glyoxal-based, formaldehyde-free elastic and stiffness finishing process for silk fabric

2017 ◽  
Vol 88 (8) ◽  
pp. 873-881 ◽  
Author(s):  
Hanfang Feng ◽  
Yanfan Wu ◽  
Xuemei Feng ◽  
Ling Zhong ◽  
Fengxiu Zhang ◽  
...  
Keyword(s):  
Weight Gain ◽  
Spectroscopic Analysis ◽  
Breaking Strength ◽  
Silk Fabric ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infrared Spectroscopic Analysis ◽  
Finishing Process ◽  
Silk Fabrics ◽  
Recovery Angle

A new formaldehyde-free reagent based on acrylamide and glyoxal was synthesized to improve the elasticity, stiffness, and weight gain of silk fabric. The finishing process could be completed rapidly in 20 seconds. The results showed that the elasticity, stiffness, and weight gain of silk fabric were efficiently improved. The stiffness was improved from 0.03 to 0.88 N·m, the delayed crease recovery angle was increased from 240° to 288.6°, and the weight gain could reach 18.1%. The finished silk fabrics were durable. The breaking strength and tear strength were substantially increased, and the whiteness of the silk was well maintained. Scanning electron microscopy revealed that the surface of the finished silk remained smooth. Fourier transform infrared spectroscopic analysis indicated the finishing reagent reacted on the silk, and X-ray diffraction analysis indicated that a new crystalline phase formed during the finishing process.

scholarly journals Synthesis of Visible Light Active Delafossite Structured CuCrO2: Optical and Photocatalytic Studies

2021 ◽  
Vol 33 (2) ◽  
pp. 465-470
Author(s):  
Nagarajan Arunkumar
Keyword(s):  
Thermal Analysis ◽  
Visible Light ◽  
Raman Spectra ◽  
Sol Gel ◽  
Reflectance Spectroscopy ◽  
Sem Analysis ◽  
Bet Surface Area ◽  
Complexing Agent ◽  
X Ray Diffraction ◽  
X Ray

Synthesis of delafossite structured CuCrO2 by sol-gel method using tartaric acid as a complexing agent is reported in present study. The product has been characterized by powder X-ray diffraction, thermal analysis (TGA/DTA), SEM, Raman spectra, BET (surface area analysis) and UV-Vis-diffused reflectance spectroscopy. Powder X-ray diffraction revealed the formation of delafossite structured CuCrO2 phase at 800 ºC for 3 h, which was further confirmed by thermal analysis that showed one weight loss and endothermic peak at above 800 ºC corresponded to the phase transition. Hexagonal plate like morphology of the synthesized powder was confirmed by SEM analysis. The Raman spectra showed three Raman scattering peaks of the delafossite structure of CuCrO2. Diffused reflectance spectroscopy (DRS) revealed that the band gap of the prepared CuCrO2 microcrystals was about 2.90 eV. In addition, the synthesized CuCrO2 was used for the degradation of p-nitrophenol and H2 generation under visible-light which showed 32.4 μmol (10.8 μmol/h) of H2 and 92 % degradation of p-nitrophenol (20 mg/L) after 4 h of visible light irradiation. Further analysis revealed that •OH and •O2 − were the main ROS responsible for p-nitrophenol degradation.

PENINGKATAN LAJU DISOLUSI ACYCLOVIR DENGAN METODE SISTEM DISPERSI PADAT MENGGUNAKAN POLOXAMER 188

2016 ◽  
Vol 5 (1) ◽  
pp. 6
Author(s):  
Budi Setiawan ◽  
Erizal Zaini ◽  
Salman Umar
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Differential Thermal Analysis ◽  
Fourier Transform Infrared ◽  
X Ray Diffraction ◽  
Poloxamer 188 ◽  
X Ray ◽  
Scanning Electron

Sebuah penelitian tentang sistem dispersi padat dari asiklovir dengan poloxamer 188 telah dilakukan formulasi dengan pencampuran secara fisika dengan rasio 1 : 1, 1 : 3, 1 : 5 dan dispersi padat 1 : 1, 1 : 3, 1 : 5 dan penggilingan 1:1 sebagai pembanding. Dispersi padat dibuat menggunakan metode pencairan (fusi), yang digabung dengan poloxamer 188 pada hotplate kemudian asiklovir dimasukkan ke dalam hasil poloxamer 188 lalu di kocok hingga membentuk masa homogen. Semua formula yang terbentuk termasuk asiklovir poloxamer 188 murni dianalisis karakterisasinya dengan Differential Thermal Analysis (DTA), X-ray Diffraction, Scanning Electron Microscopy (SEM), dan Fourier Transform Infrared (FTIR), kemudian pengambilan dilakukan  (penentuan kadar) mengunakan spektrofotometer UV pada panjang gelombang 257,08 nm dan uji laju disolusi dengan aquadest bebas CO2 menggunakan metode dayung. Hasil pengambilan  (penentuan kadar) menunjukkan bahwa semua formula memenuhi persyaratan farmakope Amerika edisi 30 dan farmakope Indonesia edisi 4 yaitu 95-110%. Sedangkan hasil uji laju disolusi untuk campuran fisik 1: 1, dan dispersi padat 1: 1, dan penggilingan 1: 1 menunjukkan peningkatan yang nyata dibandingkan asiklovir murni. Hal ini juga dapat dilihat dari hasil perhitungan statistik  menggunakan analisis varian satu arah  SPSS 17.

New Copper Compounds with Antiplatelet Aggregation Activity

2019 ◽  
Vol 15 (8) ◽  
pp. 850-862
Author(s):  
Mirthala Flores-García ◽  
Juan Manuel Fernández-G. ◽  
Cristina Busqueta-Griera ◽  
Elizabeth Gómez ◽  
Simón Hernández-Ortega ◽  
...  
Keyword(s):  
Schiff Base ◽  
Solid State ◽  
Thrombotic Event ◽  
X Ray Diffraction ◽  
Nmr Studies ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Antiplatelet Aggregation ◽  
Aggregation Activity ◽  
L1 And L2

Background: Ischemic heart disease, cerebrovascular accident, and venous thromboembolism have the presence of a thrombotic event in common and represent the most common causes of death within the population. Objective: Since Schiff base copper(II) complexes are able to interact with polyphosphates (PolyP), a procoagulant and potentially prothrombotic platelet agent, we investigated the antiplatelet aggregating properties of two novel tridentate Schiff base ligands and their corresponding copper( II) complexes. Methods: The Schiff base ligands (L1) and (L2), as well as their corresponding copper(II) complexes (C1) and (C2), were synthesized and characterized by chemical analysis, X-ray diffraction, mass spectrometry, and UV-Visible, IR and far IR spectroscopy. In addition, EPR studies were carried out for (C1) and (C2), while (L1) and (L2) were further analyzed by 1H and 13C NMR. Tests for antiplatelet aggregation activities of all of the four compounds were conducted. Results: X-ray diffraction studies show that (L1) and (L2) exist in the enol-imine tautomeric form with a strong intramolecular hydrogen bond. NMR studies show that both ligands are found as enol-imine tautomers in CDCl3 solution. In the solid state, the geometry around the copper(II) ion in both (C1) and (C2) is square planar. EPR spectra suggest that the geometry of the complexes is similar to that observed in the solid state by X-ray crystallography. Compound (C2) exhibited the strongest antiplatelet aggregation activity. Conclusion: Schiff base copper(II) complexes, which are attracting increasing interest, could represent a new approach to treat thrombosis by blocking the activity of PolyP with a potential anticoagulant activity and, most importantly, demonstrating no adverse bleeding events.

scholarly journals Struvite Grown in Gel, Its Crystal Structure at 90 K and Thermoanalytical Study

Crystals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 89 ◽  
Author(s):  
Jolanta Prywer ◽  
Lesław Sieroń ◽  
Agnieszka Czylkowska
Keyword(s):  
Thermal Analysis ◽  
Sodium Metasilicate ◽  
X Ray Diffraction ◽  
Gel Growth ◽  
Growth Technique ◽  
Thermoanalytical Study ◽  
X Ray ◽  
Cell Parameters ◽  
Thermal Analysis Techniques ◽  
Derivative Thermogravimetry

In this article, we report the crystallization of struvite in sodium metasilicate gel by single diffusion gel growth technique. The obtained crystals have a very rich morphology displaying 18 faces. In this study, the habit and morphology of the obtained struvite crystals are analyzed. The crystals were examined and identified as pure struvite by single X-ray diffraction (XRD). The orthorhombic polar noncentrosymmetric space group Pmn21 was identified. The structure of the crystal was determined at a temperature of 90 K. Our research indicates a lack of polymorphism, resulting from the temperature lowering to 90 K, which has not been previously reported. The determined unit cell parameters are as follows a = 6.9650(2) Å, b = 6.1165(2) Å, c = 11.2056(3) Å. The structure of struvite is presented here with a residual factor R1 = 1.2% at 0.80 Å resolution. We also present thermoanalytical study of struvite using thermal analysis techniques such as thermogravimetry (TG), derivative thermogravimetry (DTG) and differential thermal analysis (DTA).

Synthesis, crystal structure, luminescence, and photocatalytic properties of a 2D Cu(II) metal-organic frameworks based on 3,5-di(1H-benzimidazol-1-yl)pyridine and 4,4′-oxybis(benzoate) ligands

2020 ◽  
Vol 75 (8) ◽  
pp. 727-732
Author(s):  
Chen Zhang ◽  
Jian-Qing Tao
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Uv Light ◽  
Metal Organic Framework ◽  
Metal Organic Frameworks ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Photocatalytic Activities ◽  
Metal Organic

AbstractA new Cu(II) metal-organic framework, [Cu(L)(OBA)·H2O]n (1) [H2OBA = 4,4′-oxybis(benzoic acid), L = 3,5-di(1H-benzimidazol-1-yl)pyridine] was hydrothermally synthesized and characterized through IR spectroscopy, elemental and thermal analysis and single-crystal X-ray diffraction. Complex 1 is a four-connected uni-nodal 2D net with a (44·62) topology which shows an emission centered at λ ∼393 nm upon excitation at λ = 245 nm. Moreover, complex 1 possesses high photocatalytic activities for the decomposition of Rhodamine B (RhB) under UV light irradiation.

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