scholarly journals Molybdenum(V), germanium(IV), aluminum(III) and nickel(II) adducts with ethyleneurea, ethylenethiourea and propyleneurea: Some empirical correlations involving TG and IR data

2006 ◽  
Vol 71 (3) ◽  
pp. 263-268 ◽  
Author(s):  
Farias de ◽  
Claudio Airoldi
Keyword(s):  
Infrared Spectroscopy ◽  
Mass Loss ◽  
Elemental Analysis ◽  
Empirical Correlations ◽  
Mass Loss Step ◽  
Single Mass

The adducts MoCl5 .2eu, MoCl5 .2pu, GeCl4 .2etu, AlCl3 .2pu, AlCl3 .3pu, NiCl2 .2etu and NiCl2 .4etu (eu = ethyleneurea, etu = ethylenethiourea and pu = propyleneurea) were synthesized and characterized by elemental analysis (C, H, N), infrared spectroscopy (IR) and thermogravimetry (TG). IR Results show that eu and pu coordinate through oxygen, whereas etu coordinates through nitrogen. For all investigated adducts, a single mass loss step associated with the release of ligand molecules is observed. Empirical correlations involving TG and IR data are established.

scholarly journals Synthesis of the Guanidine Derivative: N-{[(7-(4,5-Dihydro-1H-imidazol-2-yl)-2-(p-tolyl)-6,7-dihydro-2H-imidazo[2,1-c][1,2,4]triazol-3(5H)-ylidene)amino](phenylamino)methylene}benzamide

Molbank ◽  
10.3390/m1246 ◽  
2021 ◽  
Vol 2021 (3) ◽  
pp. M1246
Author(s):  
Łukasz Balewski ◽  
Anita Kornicka
Keyword(s):  
Infrared Spectroscopy ◽  
Elemental Analysis ◽  
13C Nmr ◽  
1H And 13C Nmr ◽  
Guanidine Derivative

The guanidine derivative N-{[(7-(4,5-dihydro-1H-imidazol-2-yl)-2-(p-tolyl)-6,7-dihydro-2H-imidazo[2,1-c][1,2,4]triazol-3(5H)-ylidene)amino](phenylamino)methylene}benzamide (3) has been obtained by the reaction of one measure of N-{[7-(4,5-dihydro-1H-imidazol-2-yl)-2-(p-tolyl)-6,7-dihydro-2H-imidazo[2,1-c][1,2,4]triazol-3(5H)-ylidene]carbamothioyl}benzamide (2) with one measure of aniline in the presence of mercury(II) chloride and triethylamine in anhydrous dimethylformamide. The structure of product 3 was confirmed by 1H and 13C-NMR, infrared spectroscopy, and elemental analysis.

scholarly journals Study of thermal behavior of phytic acid

2013 ◽  
Vol 49 (2) ◽  
pp. 275-283 ◽  
Author(s):  
André Luis Máximo Daneluti ◽  
Jivaldo do Rosário Matos
Keyword(s):  
Thermal Decomposition ◽  
Thermal Behavior ◽  
Mass Loss ◽  
Kinetic Study ◽  
Phytic Acid ◽  
Absorption Spectroscopy ◽  
Elemental Analysis ◽  
Reaction Order ◽  
Dehydration Process ◽  
Thermogravimetric Method

Phytic acid is a natural compound widely used as depigmenting agent in galenic cosmetic emulsions. However, we have observed experimentally that phytic acid, when heated to 150 ºC for around one hour, shows evidence of thermal decomposition. Few studies investigating this substance alone with regard to its stability are available in the literature. This fact prompted the present study to characterize this species and its thermal behavior using thermal analysis (TG/DTG and DSC) and to associate the results of these techniques with those obtained by elemental analysis (EA) and absorption spectroscopy in the infrared region. The TG/DTG and DSC curves allowed evaluation of the thermal behavior of the sample of phytic acid and enabled use of the non-isothermal thermogravimetric method to study the kinetics of the three main mass-loss events: dehydration I, dehydration II and thermal decomposition. The combination of infrared absorption spectroscopy and elemental analysis techniques allowed evaluation of the intermediate products of the thermal decomposition of phytic acid. The infrared spectra of samples taken during the heating process revealed a reduction in the intensity of the absorption band related to O-H stretching as a result of the dehydration process. Furthermore, elemental analysis results showed an increase in the carbon content and a decrease in the hydrogen content at temperatures of 95, 150, 263 and 380 °C. Visually, darkening of the material was observed at 150 °C, indicating that the thermal decomposition of the material started at this temperature. At a temperature of 380 °C, thermal decomposition progressed, leading to a decrease in carbon and hydrogen. The results of thermogravimetry coupled with those of elemental analysis allow us to conclude that there was agreement between the percentages of phytic acid found in aqueous solution. The kinetic study by the non-isothermal thermogravimetric method showed that the dehydration process occurred in two stages. Dehydration step I promoted a process of vaporization of water (reaction order of zero), whereas dehydration step II showed an order of reaction equal to five. This change in reaction order was attributed to loss of chemically bonded water molecules of phytic acid or to the presence of volatile substances. Finally, the thermal decomposition step revealed an order of reaction equal to one. It was not possible to perform the kinetic study for other stages of mass loss.

scholarly journals TG pyrolysis of a mixture of dried sludge from urban wastewater and wood pellets and identification of the composition of the resulting gases by infrared spectroscopy

Energetika ◽  
2021 ◽  
Vol 67 (1) ◽  
Author(s):  
Giedrius Stravinskas ◽  
Anupras Šlančiauskas
Keyword(s):  
Infrared Spectroscopy ◽  
Sewage Sludge ◽  
Mass Loss ◽  
Evolved Gas Analysis ◽  
Waste Incineration ◽  
Small Towns ◽  
Gas Analysis ◽  
Wood Pellets ◽  
Intense Mass ◽  
Dried Sludge

The recent tendency of sewage sludge disposal is targeted towards the gasification for heat generation in small towns far from waste incineration plants. The scope of this article is to present the investigation into the mixture of dried sewage sludge and wood pellets during pyrolysis by thermogravimetry (TG) with evolved gas analysis by TG-coupled Fourier transformation infrared spectroscopy (FTIR) method. The maximum intensity of mass loss of sewage sludge material occurs at 300–310°C temperature and it differs from wood cellulose case of 360°C. The 50:50% mixture of these materials was investigated in more details. Pyrolysis reaction kinetics is described by a variation of three constituent parts from TG data. Prefactor A and activation energy E of the Arrhenius law were found, and reaction order n was determined by the Ozawa method employing Avrami phase change. The maximum of gas evolution is always related to the most intense mass loss, and gas composition correlates with the initial material.

Synthesis, Structure and Properties of Two-Dimensional Coordination Polymer Based on 3,5-di(benzimidazol-1-yl)pyridine

2020 ◽  
Vol 42 (2) ◽  
pp. 249-249
Author(s):  
Guo Jun Wu Guo Jun Wu
Keyword(s):  
Infrared Spectroscopy ◽  
Coordination Polymer ◽  
Single Crystal ◽  
Photocatalytic Degradation ◽  
Elemental Analysis ◽  
Solvothermal Reaction ◽  
Two Dimensional ◽  
Structure And Properties ◽  
X Ray Diffraction ◽  
X Ray

[Cu(L)(AIP)·1.5H2O]n (1) [L= 3,5-di(benzimidazol-1-yl)pyridine, H2AIP= 5-aminoisophthalic acid] was prepared by the solvothermal reaction, which was characterized by single-crystal X–ray diffraction, infrared spectroscopy, and elemental analysis. 1 exhibits an infinite two dimensional [Cu(AIP)]n sheet parallel to (0 1 1) crystal plane. Furthermore, complex 1 displays good photocatalytic degradation of methyl blue (MB).

Preparation, chromatographic evaluation and comparison of cystine- and cysteine-bonded stationary phases

2014 ◽  
Vol 6 (7) ◽  
pp. 2205-2214 ◽  
Author(s):  
Luan Xu ◽  
Tong Zhao ◽  
Xingmei Guan ◽  
Wanjin Tang ◽  
Xiaoyan Liu ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Elemental Analysis ◽  
Uv Spectroscopy ◽  
Stationary Phases ◽  
Fourier Transform Infrared ◽  
Silica Support ◽  
Bonded Stationary Phases

In this paper, cystine- and cysteine-bonded stationary phases were synthesized and characterized by UV spectroscopy, Fourier transform infrared spectroscopy and elemental analysis which proved the successful immobilization of cystine and cysteine on the silica support.

Synthesis, characterization, crystal structure, electrochemical, solvatochromic and biological investigation of novel N4 and N3 type Cu(ii) Schiff base complexes

2017 ◽  
Vol 41 (21) ◽  
pp. 12554-12561 ◽  
Author(s):  
Akbar Azary ◽  
Abolfazl Bezaatpour ◽  
Saber Zahri ◽  
Mandana Amiri
Keyword(s):  
Crystal Structure ◽  
Schiff Base ◽  
Infrared Spectroscopy ◽  
Elemental Analysis ◽  
Schiff Base Complexes ◽  
Conductivity Measurements ◽  
Biological Investigation ◽  
X Ray ◽  
X Ray Crystallography

In the present study, three novel Cu(ii) Schiff base complexes were synthesized and characterized using infrared spectroscopy, elemental analysis, conductivity measurements and X-ray crystallography.

scholarly journals Preparation and Thermogravimetric and Antimicrobial Investigation of Cd (II) and Sn (II) Adducts of Mercaptopyridine, Amino Triazole Derivatives, and Mercaptothiazoline Organic Ligand Moieties

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Ahmed Gaber ◽  
Walaa F. Alsanie ◽  
Robson F. de Farias ◽  
Moamen S. Refat
Keyword(s):  
Infrared Spectroscopy ◽  
Solid State ◽  
Organic Ligand ◽  
Antimicrobial Activities ◽  
Metal Chloride ◽  
Cross Linking ◽  
Water Molecules ◽  
Solid State Route ◽  
Coordination Sites ◽  
Mass Loss Step

The solid adducts of SnCl2.(3amt).H2O, SnCl2.2(3amt).H2O, CdCl2.(3amt), CdCl2.2(3amt), SnCl2.(2mct).0.5H2O, SnCl2.2(2mct), CdCl2.(2mct), CdCl2.2(2mct).H2O, SnCl2.(2mcp).1.5H2O, >2.2(2mcp).4H2O, CdCl2.(2mcp), CdCl2.2(2mcp), SnCl2.(4amt).4H2O, SnCl2.2(4amt).1.5H2O, CdCl2.(4amt).H2O, and CdCl2.2(4amt) (where the 3amt, 4amt, 2mct, and 2mcp represent 3-amino-1,2,4-triazole, 4-amino-1,2,4-triazole, 2-mercaptothiazoline, and 2-mercaptopyridine simple organic chelates, respectively) were prepared using a solid-state route and investigated by CHN elemental analysis and infrared spectroscopy. Additionally, we investigated the thermogravimetric characterization and antimicrobial proprieties. It is verified that for 3amt and 4amt adducts, the coordination occurs through nitrogen atom. For 2mct compounds, the coordination occurs through nitrogen (Sn) or sulfur (Cd). For 2mcp adducts, both coordination sites nitrogen and sulfur are involved. By examination of TG curves, it is confirmed that for each hydrated compounds, the first mass loss step is linked with the release of water molecules followed by the release of ligand molecules and sublimation of the metal chloride. Furthermore, it is verified that, considering only the release of ligand molecules (3amp, 4amp, 2mct, or 2mcp), the cadmium adducts are always more stable than the correspondent tin adducts probably due to the formation of cross-linking bonds in these compounds. Finally, of these 16 adducts, 14 showed antimicrobial activities against different bacterial and fungal strains.

scholarly journals Studying Reactivity Relationships of Copolymers N-naphthylacrylamide with (Acrylicacid and Methylacrylate)

2019 ◽  
Vol 16 (2) ◽  
pp. 0345
Author(s):  
Ameen Hadi Mohammed
Keyword(s):  
Fourier Transform ◽  
Thermal Properties ◽  
Infrared Spectroscopy ◽  
Free Radical ◽  
Statistical Method ◽  
Benzoyl Peroxide ◽  
Elemental Analysis ◽  
Reactivity Ratios ◽  
Sequence Distribution ◽  
Ft Ir

            The organation ⁄monomer N-naphthylacrylamide (NAA) was prepared; subsequently the synthesized monomer was successfully copolymerized with acrylicacid (AA) and methylacrylate (MA) by free radical technique using dry benzene as solvent and benzoyl peroxide (BPO) as initiator. The overall conversion was kept low (≤ 10% wt/wt) for all studies copolymers samples. The synthesized monomer and copolymers were characterized using Fourier transform infrared spectroscopy (FT-IR), and their thermal properties were studied by DSC and TGA. The copolymers compositions were determined by elemental analysis. Kelen-Tudes and Finmman-Ross graphical procedures were employed to determine the monomers reactivity ratios. The derived reactivity ratios (r1, r2) are: (0.048, 0.687) for (NAA-co-AA) and (0.066, 0.346) for (NAA-co-MA). Based on the average reactivity ratios, sequence distribution of monomers in the copolymers and the microstructure of copolymers were calculated by statistical method and found that these values are in agreement with the derived reactivity ratios.

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