2024-03-29T10:43:11Z
https://ejchem.journals.ekb.eg/?_action=export&rf=summon&issue=281
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2012
55
3
The Effect of Magnetic Field on the Solubility of Na2CO3 and Na2CO3. H2O at Different Temperature and pH Values
THE EFFECT of static magnetic field of 450 gauss magnetic power on the electrical conductivity (E.C.) of 1000 ppm anhydrous sodium carbonate and monohydrate sodium carbonate solutions as a function to the solubility at different temperature and pH values was studied. A magnetic funnel of 41.66 ml/sec flow rate was used to prepare the magnetic water by passing the later 1, 5 and 10 times, before dissolving the anhydrous sodium carbonate and monohydrate sodium carbonate salts. It was found that, the increasing in pH value is more influential as compared with the elevation in temperature degree. In general, the E.C. value of magnetic solution of anhydrous sodium carbonate is higher than monohydrate sodium carbonate solution and both are higher than non-magnetic solutions. As a result it can be concluded that the use of magnetized water will increase the solubility of anhydrous sodium carbonate and monohydrate sodium carbonate salts. Therefore, we are recommending using the magnetized solutions of these two kinds of salts in biological, industrial and physiological systems.
magnetic field
Na2CO3 & Na2CO3.H2O solubility and Different T & pH values
2012
06
30
213
221
https://ejchem.journals.ekb.eg/article_1151_33cc9d2dac2a4ef68905b88e1c828d2b.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2012
55
3
Studies of Uranyl (UO2)+2 and Thorium (Th)4+ Complexes with some Azo-β-diketone in Methanol- water Solvent
THE THERMODYNAMIC parameter of complexes of UO2(II)and ……Th(IV) cations with ortho substituted of some phenyl hydrazo compounds of di-bnzoyl methane or acetoacetanilide was studied. The ortho-substitution involves carboxy or phenolic or thiol groups. The potentiometric titrations were carried out in 75% (v/v) methanol-water and 0.10 M KNO3. The thermodynamic parameters have been divided into electrostatic (el.) and non-electrostatic (non), which give some light upon the nature of the coordination between metal ions and ligands. Comparison of the experimental and calculated (using modified Born equation) values of ΔG indicates the inner sphere nature of all the complex systems. Spectrophotometric studies were carried out between UO2(II) and o-hydroxy phenyl hydrazo acetoacetanilide. Also, conduct metric titration for both UO2(II) and Th(IV) with o-carboxy phenyl-hdrazo acetoacetanilide to confirm the stoichiometric structures of formed complexes was calculated. The solid complexes were isolated and characterized by elemental analysis, infrared and TG, DTG and DTA measurements. The results show that the ligands behave towards the metal ion as dibasic tridentate ligands.
Azo-β-diketone complexes
Potentiometric titration
Thermodynamic parameter
TG
DTG and DTA and Solid complexes
2012
06
30
223
238
https://ejchem.journals.ekb.eg/article_1152_99ca62c1c5fe1fa4f1034d182e7b73fc.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2012
55
3
Some New 2-Amino-4-(N-substituted-1H- indol - 3-yl) thiophene-3-carbonitriles and their Antimicrobial Properties
ANOVEL series of 2-amino-4-(N-substituted-1H-indol-3-yl) thiophene-3-carbonitriles (3a-f) were prepared via reaction of 2-(1-(N-substituted -1H-indol-3-yl) ethylidene) malononitriles (2a-f) with sulfur (Gewald reaction). Reaction of 3a-f with formic acid, formamide or malononitrile led to the formation of fused thieno [2,3-d] pyrimidin-4(3H)-ones (6a-f) thieno[2,3-d] pyrimidin-4-amines (7a-f) and thieno[2,3-d] pyridine-3-carbonitriles (8a-f), respectively. On the other hand, a series of 2-(2-(4-nitrophenyl)-4-oxothiazolidin-3-yl)-4-(N-substituted-1H-indol-3-yl) thiophene-3-carbonitriles (10a-f) and N-3- [3-cyano-4-(N-substituted-1H-indol-3-yl)- (2-thienyl) -4-oxo-2- imino thiazolidinylidenes (12a-f), were prepared via reaction of Schiff bases 9a-f with thioglycollic acid or reaction of chloroacetamids 11a-f with potassium thiocyanate, respectively. Moreover, reaction of 3a-f with ethylenediamine yielded 3-(4,5-dihydro-1H-imidazol-2-yl)-4-(N-substituted-1H-indol-3yl) thiophen-2-amines (13a-f). The antimicrobial activity of the newly synthesized compounds revealed that, 2-(2-(naphthalene-1-yl)diazenyl)-4-(N-substituted-1H-indol-3-yl)thiophene-3-carbonitriles (4a-f) showed potent inhibition of 25-33 and 18-26mm at a dose of 20 and 10 μg per disc, respectively towards Aspergillus fumigatus compared to reference drug cycloheximide.
ndole
2-Aminothiophene-3-carbonitriles
3-d] pyrimidine
Thieno [2
3-d] pyridine
Thiazolidine and Antimicrobial activity
2012
06
30
239
258
https://ejchem.journals.ekb.eg/article_1153_1364fb0954108c54530e8501a3713072.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2012
55
3
Synthesis, Characterization and Biocidal Activity of Cationic Polysaccharide (Extract from Potato) Schiff base Surfactants and their Metal Complexes
SOME cationic polysaccharide Schiff base surfactants and their …… metal complexes Ni, Cu, Fe, and Co were synthesized and their chemical structures were confirmed using FTIR, 1HNMR and UV spectroscopic analysis. The surface activities of these suractants were measured, including surface tension (), critical micelle concentration (CMC), effectiveness (cmc), efficiency (Pc20), maximum surface excess (max) and minimum surface area (Amin), interfacial tension and emulsification power at 25oC. Adsorption and micellization free energies of these amphiphiles in their solutions showed a good tendency towards adsorption at the interfaces. Also, the biocidal activity of these Schiff base surfactants and their metal complexes against bacteria (Gram positive and Gram negative) yeast, fungi and also against sulfate reducing bacteria was studied.
Quaternary ammonium amphiphiles
Micellization
Adsorption
Surface properties polysaccharides
Schiff bases
Metal complexes and Biocidal activity
2012
06
30
259
275
https://ejchem.journals.ekb.eg/article_1154_d05fa1a5ea9c9f640a813ff2d812f2ba.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2012
55
3
Synthesis of Organometallic-based Biologically Active Compounds: In vitro Antibacteroial and Antifungal of Asymmetric Ferrocene-derived Schiff-bases Complexes
ASYMMETRIC 1,1`-disubstituted ferrocene- derived Schiff- ……..bases have been prepared and used as ligands in the preparation of their novel Pd(II) and Pt(IV) metal chelates. The synthesized ligands and their metal chelates have been characterized by their physical, analytical and spectral data. These have also been used for screening against B. subtilis, S. aureus, E. coli, S. typhi (bacteria), C. albicans (yeast), A. niger and F. solani (fungi). The antimicrobial results indicated that the complexes prepared are more active than the ligand and have been found to be a novel class of organometallic-based antimicrobials.
Ferrocene-derived Schiff bases ligands
Palladium (II) chelates
Platinum (IV) chelates and Organometallic-based antimicrobials
2012
06
30
277
290
https://ejchem.journals.ekb.eg/article_1155_321a18e69f7402ae04b5a7876c4936d4.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2012
55
3
Adsorption Efficiency of Chemically Modified Chitosan towards Copper and Cobalt Ions from Industrial Waste Water
IN THIS study, chitosan was produced and characterized using NMR, IR, DSC and TGA analyses. Its molecular weight was determined using GPC analysis. The produced chitosan was chemically modified by reaction with glycine and chloroacetic acid. Its adsorption capacity for Cu(II) and Co(II) ions from industrial wastewater was determined and compared to the virgin chitosan. The chemical structures of the prepared biosorbents were confirmed by FTIR and
1H–NMR. The adsorption efficiencies of the two biosorbents in neutral (pH=7) and alkaline medium (pH=9) at 25oC were determined using atomic absorption spectroscopy (AAS) and thermo-gravimetric analysis (TGA). The two biosorbents show lower adsorption efficiency towards copper and cobalt ions compared to the virgin biosorbent (pure chitosan). Furthermore, the adsorption capacity of glycine–chitosan was higher than the chloroacetic acid–chitosan biosorbents, which is attributed to the chelating effect of the amino groups than the chloro–substituted polymer.
Chitosan
industrial waste water
Cobalt and Copper ions
2012
06
30
291
305
https://ejchem.journals.ekb.eg/article_1156_544fcbfbac51b89fb4d9aa0f6305ea36.pdf
Egyptian Journal of Chemistry
Egypt. J. Chem.
0449-2285
0449-2285
2012
55
3
Characterization and Catalytic Activity of Ni, Mo and Ni-Mo Supported on Al2O3 Systems
ASERIES of Ni, Mo and Ni-Mo supported alumina catalysts were …….prepared for investigating the interaction between Ni and Mo in terms of their structural properties and catalytic activities.The samples were prepared by wet impregnation with 20 wt% total loading (NiO+MoO) in different molar ratios. The investigated samples were characterized by DSC, TGA, XRD and BET. The catalytic activity and selectivity were studied using isopropanol conversion in flow system under normal pressure at temperature range300-360˚C and space velocity 11.60-18.40 ml.min-1. The reaction products were analyzed using gas liquid chromatography. The main product is acetone and the activation energy is calculated over the investigated catalysts. The results demonstrate that Mo loading enhances formation of NiAl2O4 phase.
Isopropanol
Dehydration
NiAl2O4
Bimetal oxide and BET
2012
06
30
307
319
https://ejchem.journals.ekb.eg/article_1157_9ee5782a3d7cd29aa98f1d6bf37f9322.pdf