Synthesis, Characterization and Thermal studies of Novel Organomercury Driven from Sulfa Drugs Part 1

2011 ◽  
Vol 7 (2) ◽  
pp. 1338-1347
Author(s):  
Tarek Ali Fahad ◽  
Shaker.A.N. AL-Jadaan
Keyword(s):  
Thermal Decomposition ◽  
Thermal Behavior ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Thermal Studies ◽  
Spectroscopic Techniques ◽  
Sulfa Drugs ◽  
Acid Base ◽  
Ph Values ◽  
Multi Stage

Two new heterocyclic Organmercury compounds   were prepared from the reaction of Sulfamethaxazole and Sulfadiazine with 4-acetaminophenol as a coupler and separated as solids with characteristic colors. these compounds were characterized by F.T.IR-spectroscopy 1H-NMR , Micro-elemental Analysis and UV-Vis spectroscopic techniques . The work involves a study of acid – base properties compounds at different pH values, the ionization and protonation constants were calculated. The thermal behavior of these two compounds   were investigated on the basis of thermogravimetric (TGA) and differential thermogravimetric (DTG) analyses, Thermal decomposition of these compounds is multi-stage processes.

scholarly journals Characterization and Thermal Analysis of Mercury Complexes Containing Intermolecular N→Hg Interactions

2011 ◽  
Vol 8 (s1) ◽  
pp. S502-S508
Author(s):  
Hajar Sahebalzamani ◽  
Farshid Salimi ◽  
Shahriare Ghammamy
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Thermal Behavior ◽  
Elemental Analysis ◽  
Analytical Methods ◽  
Coordination Mode ◽  
Multi Stage ◽  
Mercury Complexes ◽  
Differential Thermogravimetry

The new mercury (II) compounds with (L1), (L2) of the general formula [Hg(L)2], have been synthesized and characterized by elemental analysis, electronic and IR, Raman spectra and thermogravimetry and differential thermogravimetry techniques. The changes observed between the spectra of the ligands and of the complexes allowed us to stablish the coordination mode of the metal in complexes and the mechanism of C–H activation is discussed in detail. Thermogravimetry (TG), differential thermal analysis (DTA) and other analytical methods have been applied to the investigation of the thermal behavior and structure of the compounds [Hg(L)2]. Thermal decomposition of these compounds is multi-stage processes.

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 Metal ion promoted synthesis of pentaazamacrocyclic complexes of a few first row transition metal series derived from 2,6-diaminopyridine

2005 ◽  
Vol 70 (11) ◽  
pp. 1273-1281
Author(s):  
Ali Khan ◽  
Shabana Tabassum ◽  
Nishat Begum ◽  
Poonam Chingsubam
Keyword(s):  
Magnetic Susceptibility ◽  
Transition Metal ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Metal Ion ◽  
Condensation Reaction ◽  
Spectroscopic Techniques ◽  
Conductivity Measurements ◽  
Template Condensation ◽  
Square Planar

Anew series of dichloro/dinitrato (2,6,9,13,18-pentaazacbicyclo [12.3.1]octadeca -1(18),14,16-triene) metal(II) [MLX2](M = Mn(II), Co(II), Ni(II) and Zn(II); X = Cl or NO3) and (2,6,9,13,18-pentaazacyclo[12.3.1]octadeca-1(18),14,16-triene) copper(II) dichloride/dinitrate [CuL]X2 (X = Cl or NO3) have been synthesized by the template condensation reaction of 2,6-diaminopyridine with 1,2-diaminoethane and 1,3-dibromopropane. The complexes were studied by elemental analysis, magnetic susceptibility and conductivity measurements. Various spectroscopic techniques, viz. IR, 1H-NMR, EPR, UV/Vis, were used to establish their structures. Except for the complexes of copper(II), which are square planar, all other complexes have octahedral structures.

scholarly journals Thermo-kinetic and spectral studies of niobium(V) complexes with 3-substituted-4-amino-5-mercapto-1, 2, 4-triazole Schiff bases

2005 ◽  
Vol 70 (4) ◽  
pp. 643-650 ◽  
Author(s):  
Kalagouda Gudosi ◽  
Prabhugouda Maravalli ◽  
Timmanagouda Goudar
Keyword(s):  
Thermal Decomposition ◽  
Nmr Spectroscopy ◽  
Gibbs Energy ◽  
Schiff Bases ◽  
Elemental Analysis ◽  
1H Nmr Spectroscopy ◽  
Thermal Studies ◽  
Nitrogen Atmosphere ◽  
Molar Conductance ◽  
Spectral Studies

Metal complexes of niobium(V) with 3-substituted-4-amino-5-mercapto 1,2,4-triazole Schiff bases have been synthesized in dry chloroform under a nitrogen atmosphere. They were characterized by elemental analysis, molar conductance, electronic, infrared, 1H-NMR spectroscopy and thermal studies. Parameters, such as energy of activation (Ea), enthalpy (?H#), entropy (?S#) and Gibbs energy (?G#), were computed from the thermal decomposition data. Based on the spectral and thermal studies, a coordination number of seven is proposed.

Novel carbocyanine and bis-carbocyanine dyes: synthesis, visible spectra studies, solvatochromism and halochromism

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Spectral Data ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Cyanine Dyes ◽  
Ethanol Solution ◽  
Carbocyanine Dyes ◽  
Buffer Solutions ◽  
Ph Values ◽  
Universal Buffer ◽  
Visible Spectra

Novel carbocyanine dyes (trimethine cyanine dyes) and bis-carbocyanine dyes (bis-trimethine cyanine dyes) derived from the nucleus of benzo[2,3-b; 2',3'-b'] bis-furo[2,3-d]imidazoline-3,5,8,10-tetra one were synthesized. The electronic visible adsorption spectra of all the synthesized cyanine dyes were investigated in 95% ethanol solution. Solvatochromism and/or halochromism for some selected dyes were examined in pure solvents having different polarities (water, dimethylformamide, ethanol, chloroform, carbontetrachloride and dioxane) and/or in aqueous universal buffer solutions owing varied pH values (1.45, 2.03, 3.72, 5.09, 7.57, 8.91, 10.20 and 12.04 units), respectively. Structural confirmations were determined by elemental analysis, visible, mass, IR and 1H NMR spectral data.

scholarly journals Synthesis, characterization and spectroscopic properties of some new phenylazo-6-aminouracil

2008 ◽  
Vol 6 (1) ◽  
pp. 81-88 ◽  
Author(s):  
Zeynel Seferoğlu ◽  
Nermin Ertan
Keyword(s):  
1H Nmr ◽  
Elemental Analysis ◽  
Substituent Effects ◽  
Spectroscopic Properties ◽  
Spectroscopic Techniques ◽  
Acid And Base ◽  
Ft Ir

AbstractIn this study, a series of new 5-phenylazo-6-aminouracil dyes were prepared by linking m-,p-nitroaniline, m-,p-chloroaniline, m-,p-anisidine, m-,p-toluidine, m-,p-cyanoaniline, p-ethoxyaniline, p-phenoxyaniline, p-ethylaniline, p-acetamidoaniline, p-acetylaniline, p-carboxyaniline and aniline to 6-aminouracil. The prepared dyes were characterized by UV-vis, FT-IR, 1H NMR spectroscopic techniques and elemental analysis. The effect of acid and base upon the UV-vis spectra of these dyes were investigated. In addition, the solvatochromic behaviors and substituent effects in various solvents were evaluated.

scholarly journals Synthesis, spectroscopic, and thermal studies of azo compounds from luminol and procaine with acetylacetone and their complexes

2021 ◽  
Vol 2063 (1) ◽  
pp. 012016
Author(s):  
Noor Al AlBaheley ◽  
T A Fahad ◽  
Asaad A Ali
Keyword(s):  
Thermal Decomposition ◽  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Elemental Analysis ◽  
Azo Dyes ◽  
Thermal Studies ◽  
Bidentate Ligand ◽  
Azo Compounds ◽  
Molar Ratios ◽  
Ft Ir

Abstract This The study entails the synthesis of two newly synthesized azo dyes luminol and procaine with acetylacetone (N1 and N2 correspondingly). Elementalanalysis, 1HNMR, T.G.A, and FTIR. have all been used to characterize dyes. These new dyes were reacted with Cpper and Nikel ionin 1:2 molar ratios to form of complexes of metals (II) with a general stoichiometry; CuL2, and NiL2 in complexes., FT IR, as well as the corresponding metal (II) complex, were used to characterize them. The dye acts as a bidentate ligand, according to elemental analysis and spectral results. The thermal properties of these compounds were investigated using thermogravimetric analysis (TGA). Thermal decomposition of these compounds is a process that occurs in stages.,

Synthesis, Characterization, and Acid - Base Properties of Ruthenium(II) Complexes Containing N-ethyl-4-([1,10]-phenanthroline[5,6 - f]imidazol-2-yl)carbazole

2010 ◽  
Vol 63 (4) ◽  
pp. 700 ◽  
Author(s):  
Li Xu ◽  
Peng-Xin Liu ◽  
Guo-Liang Liao ◽  
Xiang Chen ◽  
Hui Chao ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Nmr Spectroscopy ◽  
1H Nmr ◽  
Elemental Analysis ◽  
1H Nmr Spectroscopy ◽  
Room Temperature ◽  
Emission Spectra ◽  
Ph Effects ◽  
Acid Base ◽  
Polypyridyl Complexes

Three new ruthenium(ii) polypyridyl complexes, [Ru(phen)2(Hecip)]2+ (1), [Ru(phen)(Hecip)2]2+ (2), and [Ru(Hecip)3]2+ (3) complexes (phen = 1,10-phenanthroline, Hecip = N-ethyl-4-([1,10]-phenanthroline[5,6–f]imidazol-2-yl)carbazole) were synthesized and characterized by ES-MS, 1H NMR spectroscopy, elemental analysis, and cyclic voltammetry. The emission spectra of complexes were measured both at room temperature and at 77 K in a 4/1 (v/v) EtOH/MeOH matrix. All three complexes display luminescence properties which are close to that featured by the parent [Ru(phen)3]2+ species. The pH effects on the UV-vis and emission spectra of RuII complexes were also studied, and complexes 1, 2, and 3 were found to act as ‘on–off’ luminescent pH switches with maximum on–off ratios of 17, 230, and 90, respectively.

Elemental analysis and bioactivities of Echinops echinatus Roxb. (globe thistle) via spectroscopic techniques

2019 ◽  
Vol 52 (1) ◽  
Author(s):  
Nargis Jamila ◽  
Naeem Khan ◽  
In Min Hwang ◽  
Sadiq Noor Khan
Keyword(s):  
Elemental Analysis ◽  
Spectroscopic Techniques

Synthesis and Biological Evaluation of Various New Substituted 1,3,4-oxadiazole-2-thiols

2008 ◽  
Vol 59 (4) ◽  
Author(s):  
Gabriela Laura Almajan ◽  
Stefania Felicia Barbuceanu ◽  
Ioana Saramet ◽  
Mihaela Dinu ◽  
Cristian Vasile Doicin ◽  
...  
Keyword(s):  
Biological Activity ◽  
Plant Growth ◽  
1H Nmr ◽  
Elemental Analysis ◽  
13C Nmr ◽  
Biological Evaluation ◽  
Ethyl Chloroacetate ◽  
Low Concentrations ◽  
Synthesis And Biological Evaluation

5-[4-(4X-phenylsulfonyl)phenyl]-1,3,4-oxadiazole-2-thiols, X=H, Cl, Br, reacted with ethyl chloroacetate to give S-alkylated compounds. Aminomethylation of the thione form of oxadiazoles yielded N(3)-derivatives. All the products have been characterized by elemental analysis, IR, 1H-NMR and 13C-NMR. The plant-growth regulating effects of the title compounds were examined. From the biological activity results, we found that most compounds showed weak stimulatory activities at low concentrations.

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