scholarly journals Protective properties of the nickel (II) complex with tryptophan

2021 ◽  
Vol 29 ◽  
pp. 191-195
Author(s):  
E. N. Shamilov ◽  
A. S. Abdullaev ◽  
V. E. Shamilli ◽  
T.Y. Asgerova ◽  
Sh. I. Gahramanova ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Biological Properties ◽  
Complexing Agent ◽  
Protective Properties ◽  
Composition And Structure ◽  
Dta Analysis ◽  
Antiradiation Activity ◽  
Amine Groups ◽  
Thermogravimetric Studies ◽  
Complex Nickel

Aim. The synthesized and characterized of the complex nickel (II) with tryptophan [NiL2 (H2O)2]; L = Trp. It is shown that the composition of the complex obtained depends on the ratio of the initial components. Methods. The composition and structure of the complex were studied by elemental, TG/DrTG-DTA analysis and IR spectroscopy. The method of IR showed that the ligand in the composition of the metal complex enter the neutral form and coordinate with the complexing agent through the nitrogen atom. Results. The results of thermogravimetric studies have shown that the final product of the thermal decomposition of all compound is metal oxide, respectively. Conclusions. Have been studied the biological properties – the toxicity has been evaluated, the influence of the complex on the resistance to hypoxia and ant radiation activity has been determined. Keywords: tryptophan, nickel, tryptophan-metal complexes, amine groups, IR spectroscopy, thermogravimetry, toxicity, antiradiation activity.

scholarly journals Synthesis, characterization and antiradiation properties of the tryptophanates of cobalt (II), manganese (II), copper (II) and zinc

2020 ◽  
Vol 26 ◽  
pp. 154-157
Author(s):  
E. N. Shamilov ◽  
A. S. Abdullaev ◽  
M. M. Farajov ◽  
V. E. Shamilli ◽  
Sh. I. Gahramanova ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Complex Compounds ◽  
Complexing Agent ◽  
Average Life ◽  
Average Life Expectancy ◽  
Radioprotective Activity ◽  
Composition And Structure ◽  
Thermogravimetric Studies ◽  
Local Radiation ◽  
Radioprotective Properties

Aim. In order to study the radioprotective activity were were obtained in the tryptophanates of cobalt (II), manganese (II), copper (II) and zinc. Methods. The composition and structure of the complexes were studied by elemental, thermogravimetric analyzes and IR infrared spectroscopy. To determine the presence of the Radioprotective Properties of the Co (II), Mn (II), Cu (II), Zn complexes with tryptophane, a test was conducted for the 30-day survival of irradiated animals. Results. The results of thermogravimetric studies have shown that the final product of the thermal decomposition of all compounds is metal oxide, respectively. The method of IR spectroscopy showed that the ligands in the composition of the metal (II) complexes enter the neutral form and coordinate with the complexing agent through the nitrogen atom. The results of experiments with complexes showed that they have noticeable radioprotective activity. The radioprotective activity of Co (II) complexes with tryptophan is 55%, Mn (II) with tryptophan 50%, Cu (II) with tryptophan 40%, and Zn 30%. They improve the survival and average life expectancy of lethally irradiated mice, not reaching the level of the known cystamine radioprotector, which is 80%. Conclusions. The data obtained by us testify to the prospects of using the complexes of Co (II), Mn (II), Cu (II), Zn with tryptophan for preventive purposes and in order to prevent local radiation injuries. Keywords: tryptophan-metal complexes, IR spectroscopy, thermogravimetry, complex compounds, radioprotective properties.

scholarly journals Can mid-infrared (mid-IR) spectroscopy evaluate soil conditions by predicting soil biological properties?

Soil Security ◽  
2021 ◽  
pp. 100008
Author(s):  
Debabrata Nath ◽  
Ranjan Laik ◽  
Vijay Singh Meena ◽  
Biswajit Pramanick ◽  
Santosh Kumar Singh
Keyword(s):  
Ir Spectroscopy ◽  
Biological Properties ◽  
Soil Conditions ◽  
Mid Infrared ◽  
Soil Biological Properties

scholarly journals FEATURES OF THE FORMATION OF THE COATING STRUCTURE ON TITANIUM-BASED ALLOYS

2021 ◽  
pp. 3-8
Keyword(s):  
Current Density ◽  
Processing Time ◽  
Practical Interest ◽  
Zirconium Sulfate ◽  
Duration Of Treatment ◽  
Protective Properties ◽  
Composition And Structure ◽  
Electrolytic Oxidation ◽  
Plasma Electrolytic ◽  
Galvanostatic Conditions

Previously shown that coatings formed on titanium by plasma electrolytic oxidation (PEO) in an electrolyte with zirconium sulfate Zr(SO4)2 consisted of ZrO2 and TiO2 oxides, their surface layer is enriched with zirconium, they have good protective properties in chlorine-containing media. The resulting layers have a fairly regular distribution of relatively small pores, with a diameter of about 1 μm or less, on the surface. The composition and structure of PEO layers depend on both the composition of the electrolyte and the modes of formation. It is of scientific and practical interest to elucidate the effect of the conditions for the formation of coatings with ZrO2 on titanium and its alloys on their anticorrosive properties in chlorine-containing media. Samples for research were formed under anodic (unipolar) conditions at the same current density and different formation times. The samples were formed in modes with current density 0.08 A/cm2 and processing time (minutes) − 8.5; 9.5; 10; 11; 12; 13; 14; 15; 20; 30; 40; 60. The duration of treatment was chosen as to maximally repeat the anticorrosive characteristics obtained in the previous case. The work uses modern research methods, including electron microscopy, presents the results of further study of ZrO2 + TiO2 / Ti systems formed in an electrolyte with zirconium sulfate Zr(SO4)2. It has been established that coatings are formed on titanium and its alloys in an electrolyte with zirconium sulfate under galvanostatic conditions of the PEO process at i = 0.08 A / cm2 during a processing time of 11-15 min. There is a correlation between the stages of galvanostatic formation of coatings and their anticorrosive properties.

scholarly journals Comparative analysis of sorption-active fillers and methods of their introduction into a polymer matrix in the process of spinning fibrous composite materials by a solution aerodynamic method

2021 ◽  
pp. 38-43
Author(s):  
A. V. Genis ◽  
A. V. Kuznetsov ◽  
Yu. P. Nekrasov
Keyword(s):  
Comparative Analysis ◽  
Polymer Matrix ◽  
Fibrous Composite ◽  
Fibrous Materials ◽  
Active Materials ◽  
Test Environment ◽  
Protective Properties ◽  
Composition And Structure ◽  
Method Of Solution ◽  
Properties Of Materials

A comparative analysis of the efficiency of the most common types of adsorbents of various natures in a test environment with high humidity for obtaining filled fibrous sorption-active materials by the method of solution aerodynamic spinning is carried out. The influence of the spinning methods, the composition and structure of the obtained sorption-active filled fibrous materials, the nature of the polymer matrix, and the type of organic test substances on the protective properties of materials has been studied.

scholarly journals Preparation and Characterization of Polymer Composite Materials Containing Magnetite

2021 ◽  
Vol 15 ◽  
pp. 1421-1428
Author(s):  
E. R. Sadretdinova ◽  
Thant Zin Hein
Keyword(s):  
Electron Microscopy ◽  
Phase Composition ◽  
Composite Materials ◽  
Ir Spectroscopy ◽  
Polymer Processing ◽  
Flow State ◽  
Standard Methods ◽  
Composition And Structure ◽  
Polyethylene Melt

In this work, magnetite nanoparticles are introduced into a polyethylene melt at the stage of a viscous-flow state by standard methods of polymer processing (extrusion), which makes it possible to obtain a nanocomposite with a uniform nanofiller distribution. The phase composition and structure of the nanocomposite were confirmed by XRF, electron microscopy, and IR spectroscopy. It is shown that the preparation of Fe3O4/LLDPE nanocomposites is not complicated by the appearance of unidentified phases and changes in the structure of the polymer matrix.

scholarly journals Tailoring Charged Nanofiltration Membrane Based on Non-Aromatic Tris(3-aminopropyl)amine for Effective Water Softening

Membranes ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 251
Author(s):  
Pengrui Jin ◽  
Michiel Robeyn ◽  
Junfeng Zheng ◽  
Shushan Yuan ◽  
Bart Van der Bruggen
Keyword(s):  
High Performance ◽  
Molecular Structures ◽  
Water Softening ◽  
Selective Layer ◽  
Long Term Stability ◽  
Composition And Structure ◽  
Amine Groups ◽  
High Rejection ◽  
Positively Charged

High-performance positively-charged nanofiltration (NF) membranes have a profound significance for water softening. In this work, a novel monomer, tris(3-aminopropyl)amine (TAEA), with one tertiary amine group and three primary amine groups, was blended with trace amounts of piperazine (PIP) in aqueous solution to fabricate a positively-charged NF membrane with tunable performance. As the molecular structures of TAEA and PIP are totally different, the chemical composition and structure of the polyamine selective layer could be tailored via varying the PIP content. The resulting optimal membrane exhibited an excellent water permeability of 10.2 LMH bar−1 and a high rejection of MgCl2 (92.4%), due to the incorporation of TAEA/PIP. In addition, this TAEA NF membrane has a superior long-term stability. Thus, this work provides a facile way to prepare a positively charged membrane with an efficient water softening ability.

scholarly journals Ethylenediamine loading into a manganese-based metal–organic framework enhances water stability and carbon dioxide uptake of the framework

2020 ◽  
Vol 7 (3) ◽  
pp. 191934 ◽  
Author(s):  
Aisha Asghar ◽  
Naseem Iqbal ◽  
Leena Aftab ◽  
Tayyaba Noor ◽  
Benson M. Kariuki ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Metal Organic Framework ◽  
Carbon Dioxide Uptake ◽  
Coordination Sites ◽  
Carbon Dioxide Sorption ◽  
Metal Organic ◽  
Amine Groups ◽  
Thermogravimetric Studies ◽  
Original Metal ◽  
Very High

Metal–organic frameworks (MOFs) based on 2,5-dihydroxyterepthalic acid (DOBDC) as the linker show very high CO 2 uptake capacities at low to moderate CO 2 pressures; however, these MOFs often require expensive solvent for synthesis and are difficult to regenerate. We have synthesized a Mn-DOBDC MOF and modified it to introduce amine groups into the structure by functionalizing its metal coordination sites with ethylenediamine (EDA). Repeat framework synthesis was then also successfully performed using recycled dimethylformamide (DMF) solvent. Characterization by elemental analysis, FTIR and thermogravimetric studies suggest that EDA molecules are successfully substituting the original metal-bound DMF. This modification not only enhances the material's carbon dioxide sorption capacity, increasing stability to repeated CO 2 sorption cycles, but also improves the framework's stability to moisture. Moreover, this is one of the first amine-modified MOFs that can demonstrably be synthesized using recycled solvent, potentially reducing the future costs of production at larger scales.

scholarly journals IR-SPECTROSCOPIC AND THERMOGRAVIMETRIC STUDIES OF THE COBALT, COPPER AND ZINC COMPLEXES BASED ON GLYPHOSATE

2018 ◽  
pp. 31-35
Author(s):  
A. Ablyatipova A. ◽  
T. Beruashvili ◽  
K. Gubina
Keyword(s):  
Thermal Decomposition ◽  
Ir Spectroscopy ◽  
Elemental Analysis ◽  
Metal Salt ◽  
Cobalt Atom ◽  
Decomposition Temperature ◽  
Decomposition Process ◽  
Phosphoryl Group ◽  
Coordination Behavior ◽  
Dta Analysis

The complexes with Co(II), Cu(II) and Zn(II) based on glyphosate (N-phosphonomethylglycine) have been synthesized and studied by means of IR-, electron diffusion spectroscopies, thermogravimetric and elemental analysis. The coordination behavior between glyphosate and carbacylamidophosphates was compared. By means of IR spectroscopy, it was found that regardless of the ratio of reacting components (metal salt and glyphosate) the coordination compounds of the same type for each metal are always formed. The spectrum of the glyphosate and complexes with it can be divided into two parts, corresponding to the different donor groups of the ligand. Between 1500 and 1800 cm-1 strong peaks are found, mostly associated with stretching motions of the carboxylate group, while the region 800–1200 cm-1 is dominated by peaks originating from the phosphonate. The changes in frequencies of phosphate P–O (Δ(PО)=127 cm-1 for Na4CuL2, 144 cm-1 for Na4CоL2 and 21 cm-1 for ZnHL); NH– and C=O (Δ(CО)=102 cm-1 for Na4CuL2, 133 cm-1 for Na4CоL2, and 123 cm-1 for ZnHL) peaks indicate the involvement of these groups in coordination. The ν(C–O)a is shifted to higher frequency and broadened. The thermal decomposition process of glyphosate was studied by the DT and TG analysis. The results showed that the thermal decomposition temperature of glyphosate was above 198°C. And the decomposition process was divided into three stages: the zero stage is the decomposition of impurities, and the mass loss in the first and second stage may be methylene and carbonyl, respectively. It has been found that the ligand in the mentioned complexes is coordinated tridentivly via the nitrogen atom of amino group and oxygen atoms of the carbonyl and phosphate groups. The electronic spectrum of diffuse reflection of the cobalt (II) complex showed only one peak in the 534 nm region, corresponding to 4T1g (F)→ 4T1g (P) transition. This fact indicating the octahedral environment of the cobalt atom in complexes and causes its pink coloration. On the base of TGA and DTA analysis, IR spectroscopy and elemental analysis, the following compositions of the complexes were proposed: Na4CuL2, Na4CоL2 and ZnHL. Based on the literature data and our studies it was assumed that above structures contain fivemembered chelate rings with the amine, carboxylate, and phosphonate groups of the glyphosate ligand involved in chelation. Unlike 3d-metal complexes with carbacylamidophosphates, the phosphoryl group of glyphosate does not participate in coordination.

scholarly journals Synthesis and Structure of Cu(II) Complex of 4’,4’’-Diacetylcurcumin

2020 ◽  
Vol 36 (2) ◽  
Author(s):  
Pham Chien Thang ◽  
Nguyen Viet Ha ◽  
Nguyen Hung Huy ◽  
Trieu Thi Nguyet
Keyword(s):  
Ir Spectroscopy ◽  
Single Crystal ◽  
Solvent Mixture ◽  
Bidentate Ligands ◽  
X Ray Diffraction ◽  
X Ray ◽  
Composition And Structure ◽  
Xrd Method

Reaction of 4’,4’’-diacetylcurcumin (HL) with CuCl2 ∙ 2H2O in the solvent mixture of MeOH and CH2Cl2 gives rise to the corresponding complex. The composition and structure of the resulting complex are characterized and determined by the IR spectroscopy and the Single Crystal X-ray Diffraction (SC-XRD) method. The results reveal the composition [Cu(L)2] of the complex, in which 4’,4’’-diacetylcurcumin serves as monoanionic bidentate ligands with the donor sets (O,O) of the β-diketone moieties.

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