Infrared and Thermal Analysis of Vanadyl(II) Barbiturate Complex

An usual method for the preparation of vanadyl(II) barbiturate complex was performed under the chemical reaction of vanadyl(II) sulfate with barbituric acid (H2L) and formulated as: [VO(HL)2].2H2O. This new barbiturate complex was synthesis and characterized by elemental analysis, molar conductivity, magnetic measurements, infrared spectral method and simultaneous thermal analysis (TG/DTG) techniques. The molar conductance measurements proved that barbiturate vanadyl(II) complex is non-electrolytes. The infrared spectra of the barbituric and vanadyl(II) complex are used to identify the mode of coordination. Kinetic and thermodynamic parameters (E*, ΔH*, ΔS* and ΔG*) of H2L ligand and its complex are estimated according to the DTG curves.Â

New chemical procedures for preparation of manganese(II), cobalt(II), zinc(II) and cadmium(II) carbonates under the catalytic behavior of metal ions: Discussion of infrared spectral bands

Abstract: Mn(II), Co(II), Zn(II) and Cd(II) carbonates, respectively, were achieved by a new chemical procedure under the reaction of aqueous solutions of metal ions (MnCl 2 , Co(NO 3 ) 2 , Zn(NO 3 ) 2 or CdCl 2 ), potassium iodide and urea with molar ratio 1:2:10, respectively, at ~ 90 o C for 3 hrs. The infrared spectra of the results indicate absence of the essential bands of urea, but existed of the characteristic bands of ionic carbonate, CO 3 2-. An important chemical mechanisms discussed the preparation of Mn(II), Co(II), Zn(II) and Cd(II) carbonate compounds were suggested

Determination of Springback Values in Bending I-sections with Tresca Criteria

The springback ratio for bending I-section beams is introduced analytically in the present study. A complete analysis using the strength of materials approach is carried out with Tresca yielding criteria. Analytical methods are given in the form of equations for two cases according to the positions of the yield point along the height of the beam. The results represent the effect of different parameters affecting the springbackratio

In Situ Neutral System Synthesis, Spectroscopic, and Biological Interpretations of Magnesium(II), Calcium(II), Chromium(III), Zinc(II), Copper(II) and Selenium(IV) Sitagliptin Complexes

Magnesium(II), calcium(II), chromium(III), zinc(II), copper(II), and selenium(IV) sitagliptin (STG) complexes—with the general formulas [Mg(STG)2(Cl)2]·6H2O, [Ca(STG)2(Cl)2], [Cr(STG)2(Cl)2]Cl.6H2O, [Zn(STG)2(Cl)2], [Cu(STG)2(Cl)2]·2H2O, and [Se(STG)2(Cl)2]Cl2, respectively—were designed and synthesized by the chemical reactions between metal(II, III, and IV) chloride salts with an STG ligand in situ methanol solvent in a 1:2 stoichiometric ratio (metal:ligand). Tentative structures of the complexes were proposed based on elemental analysis, molar conductance, magnetic moments, thermogravimetric analysis, and spectral (infrared, electronic, and 1H NMR) data. The particle size and morphological investigation were checked on the bases of scanning electron microscopy, transmission electron microscopy, and X-ray powder diffraction analyses. All the Mg2+, Ca2+, Cr3+, Zn2+, Cu2+, and Se4+ complexes were found to be six-coordinated, wherein the STG ligands act as bidentate chelating agents. This study demonstrates that pancreatic tissues are affected by the induction of experimental diabetes mellitus and clarifies the potential of the synthesized STG complexes, which was found to more significantly improve insulin secretion and the pancreatic and glycometabolic complications of diabetic rats than STG alone

Selenium/Chitosan-Folic Acid Metal Complex Ameliorates Hepatic Damage and Oxidative Injury in Male Rats Exposed to Sodium Fluoride

Continuous exposure to sodium fluoride (NaF) imbalances the oxidative status in the body. The current study investigated the effect of the selenium/chitosan-folic (Se/chitosan-folic acid) novel metal complex on oxidative injury and tissue damage in the hepatic tissues of male rats exposed to (NaF). Male rats received NaF (10.3 mg/kg) and Se/chitosan-folic acid (0.5 mg/Kg) orally for successive 30 days. Male rats exposed to NaF showed multi-histopathological alterations in the hepatic tissues including degenerative changes. NaF exposure elevated hepatic oxidative stress markers, lipid peroxidation, and lowered the antioxidant defense enzymes. Se/chitosan-folic acid novel complex supplementation significantly prevented hepatic injury, suppressed reactive oxygen species (ROS) generation and lipid peroxidation, and enhanced the antioxidant defense enzymes. In addition, Se/chitosan-folic acid supplementation improved the hepatic tissues of NaF-exposed male rats. In conclusion, the Se/chitosan-folic acid novel metal complex protects against NaF-induced oxidative injury and tissue injury in the hepatic tissues of male rats. The Se/chitosan-folic acid novel metal complex upregulated the hepatic tissues and enhanced the antioxidant defense enzymes in male rats

Infrared spectra and thermal degradation pathway of Zn(II), Cd(II) and Hg(II) alloxan diabetes adduct

Abstract: Alloxan diabetes complexes with Zn(II), Cd(II) and Hg(II) metal ions have been separated in solid form and characterized on the basis of elemental analysis, molar conductivity, mid infrared spectra. The thermal decomposition the solid complexes was studied. The ligational behavior of Cd(II) and Hg(II) occurs through the oxygen in position 2 and the nitrogen in position 1. Concerning Zn(II) complex the complexation involving the carbonyl group in position 4 (or 6) can be realized through both pyrimidine nitrogen atom and one of the hydroxyl groups in position 5. Keywords: Alloxan; Infrared spectra; thermal studies; chelation. I-INTRODUCTION Pyrimidine derivatives are known for their varied biological properties. Brugnatelli [1] was the first to isolate "Alloxan", a pyrimidine derivative in 1818 and later this compound was found to possess antineoplastic properties ISSN: 2319-8753 International Journal of Innovative Research in Science, Engineering and Technology Vol. 2, Issue 11, November 2013 Copyright to IJIRSET www.ijirset.com 6280 II-EXPERIMENTAL II-1-Materials and instrumentation All chemicals were reagent grade and were used without further purification. Alloxan was purchased from Fluka Chemical Co., ZnBr 2 , CdCl 2 and HgCl 2 (Merck Co.). Carbon, hydrogen and nitrogen contents were determined using a Perkin-Elmer CHN 2400. The metal content was found gravimetrically by converting the compounds into their corresponding oxides at 800 o C under air condition. IR spectra were recorded on Genesis II FT-IR Spectrometer in the (4000-400 cm -1 ) range with 40 scans in KBr discs. The UV-vis, spectra were determined in the DMSO solvent with concentration (1.00× 10 -3 M) for the alloxan and their complexes using Jenway 6405 Spectrophotometer with 1cm quartz cell, in the range 800-200 nm. Molar conductivities of freshly prepared 1.0×10 -3 mol/dm 3 DMSO solutions were measured using Jenway 4010 conductivity meter. Simultaneous TGA and DTA curves were obtained on a Rigaku 8150 thermoanalyser under dynamic nitrogen atmosphere, at a heating rate of 5 deg min -1 . Preparation of these two complexes followed mainly the same procedure as preparation of Zn(II) complex, but the weight of CdCl 2 and HgCl 2 were (0.201 gm, 1.0 mmol) and (0.271 gm, 1.0 mmol), respectively. The pH was adjusted at 7.5. II.2. Synthesis of metal complexes III-RESULTS AND DISCUSSION Alloxan is one of alterdentate ligand which offers metal ion more than one equivalent coordination site. In an alterdentate ligand there is, principally, always a rearrangement possible in which the metal is transferred from one site to another one. This can be either an inter-or intramolecular process. The rearrangement reaction is kinetically controlled by the activation energy and entropy experienced by the metal on the reaction path. The free energy difference is zero by definition, if the coordination sites are equivalen

Residual stress effects on fatigue crack propagation in Butt–Welded joints for 304 stainless steel sheets

Welded joints are sensitive to fatigue failure due to cyclic loading, as well as fatigue crack propagation influenced by the distribution of welding residual stress. In this study, the fatigue crack propagation rates in butt-welded joints for 304 stainless steel sheets were evaluated in the presence of welding residual stresses. The analysis consisted of two separate models: first, a 3D-finite element (FE) model was used to predict the residual stresses due to welding; second, a numerical study was undertaken to predict fatigue crack propagation in the presence and absence of residual stress using the extended finite element method (XFEM). The crack growth model (NASGRO) and available experimental data were applied to verify the simulation results. The XFEM without residual stress effects shows good agreement with the experimental data and the NASGRO model. However, in the presence of residual stress, the simulation results show less agreement with the NASGRO model. The level and the nature of residual stress have significant effects on crack growth. A faster crack propagation rate is recognized due to the effect of tensile residual stress at the crack tip, while a higher resistance to crack growth is developed due to a compressive residual stress field