scholarly journals Synthesis and Characterization of CeVO4by Microwave Radiation Method and Its Photocatalytic Activity

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Nuengruethai Ekthammathat ◽  
Titipun Thongtem ◽  
Anukorn Phuruangrat ◽  
Somchai Thongtem
Keyword(s):  
Synthesis Method ◽  
Synthesis And Characterization ◽  
Strong Emission ◽  
Phase Purity ◽  
Energy Gaps ◽  
Visible Spectra ◽  
Direct Energy ◽  
Uv Visible ◽  
Microwave Radiation Method

A general microwave synthesis method was developed to synthesize cerium orthovanadate (CeVO4) nanostructures without the use of any catalysts or templates. This method is able to control the shape and size of the products by adjusting the pH of precursor solutions to be 1–10. Phase, purity, and different morphologies of the products were characterized by XRD, FTIR, SEM, and TEM. They showed that the as-synthesized products exhibited pure single crystalline CeVO4with tetragonal structure. Their morphologies developed in sequence as nanoparticles (pH = 4–10), nanorods (pH = 2, 3), and microflowers (pH = 1). UV-visible spectra were used to estimate the direct energy gaps of CeVO4nanorods and microflowers: 3.77 and 3.65 eV, respectively. Photoluminescence (PL) of CeVO4microflowers showed strong emission intensities at 578 nm. These results were in the range of possible application for photocatalysis, investigated by studying the degradation of methylene blue.

Sol-Gel Synthesis and Characterization of Lanthanide-Substituted Nanostructured Calcium Hydroxyapatite

2012 ◽  
Vol 86 ◽  
pp. 22-27 ◽  
Author(s):  
Irma Bogdanoviciene ◽  
Martynas Misevicius ◽  
Aivaras Kareiva ◽  
Karlis A. Gross ◽  
Thomas C.K. Yang ◽  
...  
Keyword(s):  
Sol Gel ◽  
Calcium Hydroxyapatite ◽  
Synthesis And Characterization ◽  
Reflection Spectra ◽  
Phase Purity ◽  
Lanthanide Element ◽  
End Products ◽  
Uv Visible ◽  
Sol Gel Synthesis

In this study, nanostructured Ce- and Sm-substituted Ca10(PO4)6(OH)2 samples have been synthesized using an aqueous sol-gel chemistry route. For the characterization of obtained specimens, the XRD, SEM, UV-visible reflection and IR spectroscopy and luminescence measurements were recorded. It was shown that phase purity of the end products highly depends on the amount of lanthanide element. The reflectance of lanthanide-substituted calcium hydroxyapatite samples is wavelength independent in the wavelength range of 450-800 nm and equal almost 100%. The cerium-substituted samples show a significant decrease of transmission at ~300 nm. The characteristic samarium absorption line (~430 nm) is evident in the UV-vis reflection spectra of samarium-substituted hydroxyapatites.

SYNTHESIS AND CHARACTERIZATION OF THIOPHENE-CONTAINING CHROMOPHORES FOR NONLINEAR OPTICAL (NLO) MATERIALS

2008 ◽  
Vol 17 (03) ◽  
pp. 243-254 ◽  
Author(s):  
ZUOSEN SHI ◽  
XIAOLONG ZHANG ◽  
ZHANCHEN CUI
Keyword(s):  
Absorption Maximum ◽  
Nonlinear Optical ◽  
Synthesis And Characterization ◽  
Knoevenagel Reaction ◽  
Scanning Calorimetry ◽  
Visible Spectra ◽  
Nlo Materials ◽  
Ft Ir ◽  
Uv Visible

A series of chromophores based on benzene and thiophene moieties as π-conjugating spacers were designed and synthesized by Horner-Emmons-Wadsworth reaction and Vilsmeier-Haack reaction, followed by Knoevenagel reaction with different electron acceptors. Their structures were confirmed by 1HNMR, FT-IR, HPLC-Ms, UV-visible spectra, and the thermal properties were characterized by differential scanning calorimetry (DSC). Solvatochromic method was used to measure their nonlinear optical properties. The variation of chromophoric structures on NLO properties was investigated, indicating that the cyano substitution on the vinylene bridge of the chromophore produces a considerable red-shift of the absorption maximum, and would greatly enhance the molecular quadratic hyperpolarizability (βμ).

scholarly journals Synthesis and Characterization of Some New Metals Complexes of [N-(4-Nitrobenzoyl Amino)-Thioxomethyl] Phenylalanine

2016 ◽  
Vol 13 (1) ◽  
pp. 113-121
Author(s):  
Baghdad Science Journal
Keyword(s):  
Molecular Structure ◽  
Magnetic Susceptibility ◽  
Palladium Complexes ◽  
Synthesis And Characterization ◽  
Conductivity Measurements ◽  
Tetrahedral Geometry ◽  
Visible Spectra ◽  
Ft Ir ◽  
Uv Visible

A new ligand [N-(4-nitrobenzoylamino)-thioxomethyl] phenylalanine is synthesized by reaction of 4-nitrobenzoyl isothiocyanate with phenylalanine (1:1). It is characterized by micro elemental analysis (C.H.N.S.), FT-IR, (UV-Vis) and 1H and 13CNMR spectra. Some metals ions complexes of this ligand were prepared and characterized by FT-IR, UV-Visible spectra, conductivity measurements, magnetic susceptibility and atomic absorption. From results obtained, the following formula [M(NBA)2] where M2+ = Mn, Co, Ni, Cu, Zn, Pd, Cd and Hg, the proposed molecular structure for these complexes as tetrahedral geometry, except copper and palladium complexes are have square planer geometry.

Synthesis and Characterization of a New Technetium(V) Complex with Butane-2,3-dionemonoxime and Some PPP Calculations

1991 ◽  
Vol 46 (5) ◽  
pp. 662-664
Author(s):  
Mostafa K. Hassan ◽  
Anwar S. El-Shahawy ◽  
Refaat M. Mahfouz ◽  
Ahmed H. Osman ◽  
Refeat M. Mahfouz
Keyword(s):  
Dipole Moment ◽  
Synthesis And Characterization ◽  
Mo Calculations ◽  
Molecular Dipole ◽  
Charge Densities ◽  
Visible Spectra ◽  
Uv Visible ◽  
Ci Calculation ◽  
Hplc Data

Using a PPP(SCF)—CI calculation, the structure of the butane-2,3-dionemonoxime ligand has been determined. Via SCF—MO calculations, the ionization potential, the electron affinity, the charge densities in the three states (a molecule, a cation and an anion), the SCF-HO-MO’s and the SCF-LUMO’s were calculated in addition to the molecular dipole moment. A new technetium(V) oxocomplex with butane-2,3-dionemonoxime ligand CH3COCNOHCH3 (diacetylmonoxime) has been synthesized and characterized. The complex formation was performed in an alkaline mixture of water and ethanol by reduction of pertechnetate with NaBH4 in the presence of the monoxime ligand. Infrared, UV-visible spectra, electrophoresis and HPLC data of the resulting complex are reported and discussed.

scholarly journals Synthesis and Characterization of New Oxovanadium(IV) Coordination Compounds with Pyrazol-5-one Azo Derivatives

1998 ◽  
Vol 6 (7) ◽  
pp. 91-99
Author(s):  
Anca EMANDI
Keyword(s):  
Electronic Spectra ◽  
Coordination Compounds ◽  
Synthesis And Characterization ◽  
Type I ◽  
Molecular Weights ◽  
Elementary Analysis ◽  
Visible Spectra ◽  
Azo Derivatives ◽  
Donor System

A new series of oxovanadium(IV) chelates containing bi-and tridentate pyrazol-5-one azo derivatives ligands of the type (I) [VO(L)2] and (2) [VO(L)(H2O)] have been prepared and characterized by elementary analysis, IR, electronic spectra, conductance measurements, and molecular weights. The ligands coordinate through (O-N) donor system as monobasic and bidentate (HL) for the first type and through (0-N-O) donor system as dibasic and tridentate (H2L) for the second type of complexes. The molecular weights, the presence of the (V=O) stretching band around 950 cm -1, and the visible spectra suggest a monomeric penta-coordinated structure for these complexes.

scholarly journals SYNTHESIS AND CHARACTERIZATION OF Cu (II) COMPLEXS WITH 1,4,8-TRIS(2-HIDROXYMETHIL)-11-METHYL-1,4,8,11-TETRAAZACYCLOTETRADECANE

2010 ◽  
Vol 3 (2) ◽  
pp. 70-73 ◽  
Author(s):  
Sentot Budi Rahardjo
Keyword(s):  
Ir Spectra ◽  
Magnetic Moment ◽  
Synthesis And Characterization ◽  
Chemical Formula ◽  
Visible Spectra ◽  
Cu Bonding

Cu (II) complexs with 1,4,8-tris(2-hidroxymethyl)-11-methyl-1,4,8,11-tetraazacyclotetradecane (L) have been synthesized with chemical formula of [CuL](ClO4) (experimental Cu = 32.7 %, H = 6.4%, theoritical Cu = 32.6 %, H = 6.4 %). Its magnetic moment of 1.90 BM indicated that the complexs is paramagnetic and there are no Cu-Cu bonding. This complexs is stable with the value of log k [CuL]2+ = 17.3(2). Visible spectra of [CuL]2+ showed that single wide peak at λmax of 628 nm (ε = 164 dm3.mol-1.cm-1) and indicated of E9 - T29 transition. The IR spectra and the conductancy data indicated that the ClO4 was not coordinated to Cu.   Keywords: tembaga (II), senyawa kompleks, paramagnetik

scholarly journals Synthesis and characterization of new complexes of Co+2 , Ni+2 , Cu+2 and Zn+2 with (Sodium acetate thio ) ethylene ligands

2013 ◽  
Vol 10 (3) ◽  
pp. 650-657
Author(s):  
Baghdad Science Journal
Keyword(s):  
Content Analysis ◽  
General Formula ◽  
Metal Content ◽  
Sodium Acetate ◽  
Magnetic Measurement ◽  
Synthesis And Characterization ◽  
Square Planar ◽  
Square Planar Complexes ◽  
Uv Visible

This research involves the preparation of new ligands 1,1,2,2- tetrakis (sodium acetate thio)ethylene(L1) and 1,1,2- tris(sodiumacetatethio) ethylene(L2), through the reaction of disodium thioglycolate) with tetra chloro ethylene or tri chloro ethylene in (1:4) or (1:3) moler ratio . Homodinucliar complexes of general formlu [M2(L1)] and [M2(L2)ClH2O] , when M= Co(II), Ni(II), Cu (II) and Zn(II) also mono nuclear complexes of general formula [M(L2)] . The prepared complexes were characterized using spectral method (UV/Visible/ IR) , metal content analysis , magnetic and atomic measurements . The spectral and magnetic measurement indicats that some complexes have tetrahedral or square planar complexes environtment .

Synthesis and Characterization of Gold Nanoparticles Synthesized in Gel and Paper by Electrolysis

2019 ◽  
Vol 824 ◽  
pp. 163-167
Author(s):  
Pema Dechen ◽  
Ekasith Somsook
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Gold Nanoparticles ◽  
Room Temperature ◽  
Synthesis And Characterization ◽  
Visible Spectroscopy ◽  
Gold Leaf ◽  
Uv Visible ◽  
Scanning Electron

In this report, synthesis and characterization of gold nanoparticles (AuNPs) from gold leaf by electrolysis in two different media (gel and paper) in presence of sodium chloride (NaCl), glucose (C6H12O6) and polyvinyl pyrrolidone (PVP) at room temperature were investigated. Graphite was used as two electrodes, NaCl was used as an electrolyte, C6H12O6 was used as reducing agent and PVP was used as stabilizer to control the aggregation of the nanoparticles. UV-Visible spectroscopy (UV-Vis) and scanning electron microscopy (SEM) were used to confirm the characteristics and morphologies of the synthesized AuNPs.

Synthesis and Characterization of Nanocrystalline ZnO Powders by a Novel Combustion Synthesis Method

2010 ◽  
Vol 152-153 ◽  
pp. 674-678 ◽  
Author(s):  
Bing Wang ◽  
Li Dan Tang ◽  
Jian Zhong Wang
Keyword(s):  
Crystal Structure ◽  
Combustion Synthesis ◽  
Synthesis Method ◽  
Synthesis And Characterization ◽  
Particle Sizes ◽  
Hexagonal Crystal Structure ◽  
Hexagonal Crystal ◽  
Zno Powders ◽  
Scherrer Formula

Nanocrystalline ZnO powders have been synthesized by a novel combustion synthesis method using glycine and urea as mixed fuels and zinc nitrates as oxidant. The as-synthesized ZnO powders are characterized by DSC, XRD and SEM. Results show that the as-synthesized ZnO powders show well crystalline with hexagonal crystal structure and purity without any other impurities and the particle sizes are about 50~70nm calculated by the Scherrer formula.

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