Ternary Complexes of Cd(II) Involving Pyridine-2-carboxylic Acid and Biorelevant Ligands
text
article
2016
eng
OMPLEX formation reactions involving Cd(II), pyridine -2- carboxylic acid ( picolinic acid, PA) and various biorelevant ligands (L) containing different functional groups are investigated at 25 ºC and I = 0.10 M (NaNO3). The ligands (L) used are amino acids, peptides and DNA constituents. The results showed the formation of Cd(II)-(PA)-(L) complexes with amino acids and DNA constituents, peptides form both Cd(II)-(PA)-(L) complexes and the corresponding deprotonated amide species Cd(II)-(PA)-(LH-1). The relative stabilities of ternary complexes are compared with those of the corresponding binary complexes in terms of ∆ log K values. The concentration distribution of the complexes in solution was evaluated.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
673
686
https://ejchem.journals.ekb.eg/article_1443_3843a9ecb5c1a1c403a571af979a599d.pdf
dx.doi.org/10.21608/ejchem.2016.1443
Preparation and Physicochemical Characterization of Cadmium and Zinc Ferrocyanides as Catalysts and Ion Exchangers
text
article
2016
eng
CADMIUM and zinc ferrocyanide complexes were prepared then
calcined at 100, 400, 600 and 800 °C. The obtained solids were characterized using IR, XRD, N2-adsorption measurements, H2O2 decomposition, and isopropanol conversion. The results showed that the diffractograms of ZnFeCN calcined at 600 -800°C consisted of ZnO, K2FeO4, ZnFe2O4, K2O-Fe2O3 phases while the CdFCN complexes calcined at 600-800°C composed of K2CdO2, K2Cd2O3, K2FeO4, K2O-Fe2O3 phases and Fe2O3 (Maghemite phase). The SBET of CdFeCN and ZnFeCN compounds were small and decrease with increasing the calcination temperature. CdFeCN and ZnFeCN are ion exchangers for 137Cs+-removal. The exchange of ion capacity remained almost unaffected by changing the concentration of HNO3 within 0.05-0.5M. The increase in the acid concentration above this limit brought about a significant decrease in the exchange of ion capacity. The decrease was however more pronounced in case of ZnFeCN complex. The catalytic activity of cadmium and zinc ferrocyanide complexes heated at100°C and 600 °C towards H2O2 decomposition was very small, while the complexes calcined at 800°C °C behaved as active catalysts. The catalytic activity of cadmium and zinc ferrocyanide complexes was moderate towards alcohol conversion and increased by increasing the calcination temperature. The increase was however much more pronounced in case of CdFeCN which shows better activity than ZnFeCN. CdFeCN and ZnFeCN acted mainly as dehydrogenation catalysts (above 90%).
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
687
700
https://ejchem.journals.ekb.eg/article_1444_e32db502d2a74999ac142d9c526ce478.pdf
dx.doi.org/10.21608/ejchem.2016.1444
Characterization of Eu(III) Complex for Determination of Bumetanide in Pharmaceutical Preparations and in Biological Fluids
text
article
2016
eng
U(III)-Acetylacetone complex 1 was prepared and characterized by elemental analysis, UV/Vis, IR, 1H-NMR spectroscopy, conductance and magnetism. The spectral results indicated that the composition of this complex is [Eu(acac)2(NO3)(EtOH)2(H2O)2].We development simple, sensitive and selective spectrofluorimetric method for the determination of trace amounts of bumetanide in pharmaceutical tablets and biological fluids (serum and urine) using complex 1. The bumetanide can remarkably enhance the fluorescence intensity of the complex in acetonitrile at λex/Em = 385/619 nm and pH 7.1. The dynamic ranges for the determination of bumetanide concentration were found from 1 x 10-11 to 1 x 10-4 mol L-1, and the limit of detection (LOD) and quantitation limit of detection (LOQ) are 1.6 ×10−10 and 3.2 x 10-9 mol L-1, respectively.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
701
718
https://ejchem.journals.ekb.eg/article_1445_b405b62faa45802e07476883e63ce040.pdf
dx.doi.org/10.21608/ejchem.2016.1445
Sr-substitution Effects on La-NiO3, Sol-Gel Synthesis, Structural and Electrical Properties
text
article
2016
eng
IN ORDER to investigate Sr-substitution effects on LaNiO3, LSN, …...properties, thermal analysis, x-ray diffraction, and scanning electron microscopy studies were used to characterize powder samples of La1-xSrxNiO3, x= 0, 0.3, 0.5, 0.8 and 1, prepared by the sol-gel route via the polymerized complex method. Electrical conductivity and dielectric properties of the different compositions were also done. Samples of the complex solutions of molar ratios La (Sr)/Ni/citric acid (CA)/ethylene glycol (EG) = 1:1:10:40, were heated at 130°C to reach a gel form, dried at 350°C, crushed to the precursor powder LSN, then final calcination was performed at 800°C/2hr in air according to thermal analysis results. Elemental analysis through the EDS spectroscopy confirms the compositions. Ultrafine, nanoparticle samples having perovskite (ABO3) tetragonal crystalline were formed except that of x=1, SrNiO3, which has a cubic one. The conduction mechanism changes from semi-conductive to metallic as Sr-incorporation increases and, σ seems to be temperature independent, while the dielectric values increase.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
719
729
https://ejchem.journals.ekb.eg/article_1446_733540d51f94183d2dd65126eade9866.pdf
dx.doi.org/10.21608/ejchem.2016.1446
Synthesis of New Heterocycles Incorporating 3-(N-phthalimidomethyl)-1,2,4-triazole as Antimicrobial Agents
text
article
2016
eng
NOVEL series of 1,2,4-triazole Schiff’s bases;1,2,4-……..triazolothiadiazinesand triazolothiadiazoles was prepared from reaction of 4-amino-3-(N-phthalimidomethyl)-1,2,4-triazole-5-thione and different aldehydes, hydrazonyl chlorides, 𝛼-haloketones, and substituted benzoic acids. The products have been evaluated for their antimicrobial activity and the Schiff’s bases were found to exhibit an antimicrobial activity.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
731
744
https://ejchem.journals.ekb.eg/article_1447_f1a9d9c1f40ea781c9798901eb90e83b.pdf
dx.doi.org/10.21608/ejchem.2016.1447
Synthesis of some Polymers Containing Heterocyclic Rings Corrosion Inhibitors of Mild Steel
text
article
2016
eng
A VARIETY of some polymers has been synthesized from the ……reaction of hydroxyquinazoline derivatives and amino quinazoline derivatives with methacrylic acid in the presence of N, N-dicyclo hexyl carbodimide (DCCI). The new monomers was polymerized in dimethyl form amide solution using azobis isobutyronitrile initiator. The new polymers were investigated for the corrosion inhibition properties for mild steel corrosion in Hcl solution. The result of these techniques indicated that the inhibition efficiency increased with the concentration of inhibitor and with decreasing the temperature; some thermodynamic parameters are calculated and explained for the tested systems from the data obtained at different temperatures.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
745
757
https://ejchem.journals.ekb.eg/article_1455_ea2aea5b036090dc259637911183a4e9.pdf
dx.doi.org/10.21608/ejchem.2016.1455
Microemulsion Copolymerization of Methyl Methacylate and 2-Ethyl Hexylacrylate as a Binder in Leather Finishing
text
article
2016
eng
IN ORDER to minimize the environmental impact in leather ....industry, water-based recipes are proposed in leather finishing. The application of an acrylic emulsion as a top coat system provides an excellent balance of safety, performance and commerciality in comparison with other coats. An acrylic resin nano-size latex whose colloidal particle size is about 23 nm with solids content of about 25% is prepared by copolymerization of methyl methacrylate and 2-ethyl hexylacrylate at different monomer ratios via microemulsion polymerization technique using K2S2O8 as an initiator, NaHCO3 as a buffer and sodium dodecyl sulfate as an emulsifier, performed at 70°C for 4hr. The influences of the prepared conditions on the kinetics of emulsion polymerization are studied. The produced copolymers are applied onto leather surfaces of about 90 mm thick as measured by Elcometer thickness gau ge. The particle size of the latex is tested using dynamic light scattering (DLS), and the composition of the copolymer is analyzed by nuclear magnetic resonance (1HNMR) and Fourier transform infrared spectroscopy (FTIR). The thermal stability and grain surface fibers texture are examined by thermal gravimetric analysis (TGA) and scanning electron microscope (SEM). Finally, the physical and mechanical properties of uncoated- and copolymer-coated leather are studied in details.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
759
777
https://ejchem.journals.ekb.eg/article_1448_891b61b93218b6760b90eaea2529c1ec.pdf
dx.doi.org/10.21608/ejchem.2016.1448
Chemical Synthesis of Some Novel 6-Aminouracil-2-Thiones and Their Glycoside Analogues
text
article
2016
eng
6-AMINOURACIL-2-THIONE (1) and its 5-bromo derivative 2 underwent alkylation yielding their respective S-alkyl products 4a-j. The reaction of compound 1 and aldehydes in the presence of chloroacetic acid afforded the respective thiazolopyrimidinyl acetamides 7a-d. The C-glycosides 8a,b and 9c-e were successfully prepared through condensing compound 1 and the appropriate sugar in the presence of chloroacetic acid. The behavior of certain S-alkyl derivative 4 towards amines and hydrazines was also studied. Structure elucidations for the new products were supported by compatible chemical and spectral measurements.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
779
797
https://ejchem.journals.ekb.eg/article_1449_28895c9c0a7a7f9819dd39f7f31bf010.pdf
dx.doi.org/10.21608/ejchem.2016.1449
Application of Poly (Tetraflouroethylene) Grafted with Styrene/Acrylic Acid for Proton Exchange Fuel Cell
text
article
2016
eng
AMMA irradiation was used effectively for grafting styreneand …….acrylic acid onto commercial poly(tetraflouroethylene) (PTFE) films with 0.5% alumina nano-particle. Itwas found that; 40 KGy was the optimum dose to attain the maximumgrafting yield when the monomers ratio was 60% styrene: 40% acrylicacid. The prepared membranes are characterized using FT-IR, tensilestrength and scanning electron microscopy. Some parameters such aswater uptake, ion exchange capacity and proton conductivity weredetermined in order to examine the membranes capability for the fuelcell application. The free volumes sizes were evaluated using positronannihilation lifetime spectroscopy (PALS). Fuel cell performancebased the highest grafted yield membrane was tested onto protonexchange membrane fuel cell (PEMFC). The membrane proved theirapplicability up to 450 hr that recommend their utility from the costbenefit point of view.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
799
818
https://ejchem.journals.ekb.eg/article_1458_9160accfdd22c51f6df0a3fad463a225.pdf
dx.doi.org/10.21608/ejchem.2016.1458
ZnTiO3 Nanoparticles as Novel Multifunctional Finishing of Cotton Fabric
text
article
2016
eng
MULTIFUNCTIONAL textiles, a topic which is important fromscientific and economic point of view will be the new directionfor development of fabrics and clothing. Finishing of textiles withnanoparticles is a novel rout for creation of unique functions.It iswell known that ZnO and TiO2 possess UV-protection, antibacterialand photocatalytic properties, but there is no enough informationconcerning the similar behavior of ZnTiO3. This provokes theinterest to synthesize that compound and to examine its UVprotectionand antibacterial properties in addition to its photocatalyticactivity. In this study the synthesis and use of hybrid polymersloaded with ZnTiO3 nanoparticles were presented. Hybridpolymerused here are based on 3-glycidyloxypropyltrimethoxysilane(GPTMS). ZnTiO3 nanoparticles was used to impart cotton basedfabric UV-protection, antibacterial and self-cleaning properties. Theviability of the novel finishing as UV-protection will be dictatedbyUV-Vis spectroscopy and byassessment of the ultraviolet protectionfactor (UPF). The antibacterial activity of these sol-gel derivedhybrid materials will be researched against Gram-negative bacteriumEscherichia coli DSMZ 498 and Gram-positive Micrococcus lutuesATCC 9341. Photocatalytic degradation (decolorization) ofmethylene blue (MB) in both ZnTiO3 nanoparticles sol-gel solution/or on the coated fabrics was evaluated. The impact of this finishingtechnique on other fabric properties, e.g. air permeability,whiteness,and stiffness will be investigated
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
819
831
https://ejchem.journals.ekb.eg/article_1467_4cbf6e11ff03f4519d08ac73a8f30d04.pdf
dx.doi.org/10.21608/ejchem.2016.1467
The Electrochemical Behaviour of 70-30 Cu-Ni Alloy in LiBr Solutions
text
article
2016
eng
THE BEHAVIOUR of 70-30Cu-Ni alloy has been investigated indifferent concentrations of LiBr solutions from 10-1 to 9 M.Electrochemical measurements and surface examination complementedwith solution analysis were carried out. The results revealed that thepassivation current of (Ip1) at low anodic potential (-200) is due tothe formation of a doped Cu2O film involving surface enrichment ofnickel. Increasing the anodic potential to ≥ 300 mV, after theformation of a peak of anodic current maximum (Ip2) a partiallypassive film of Cu2(OH)3 Br is formed and the surface suffered fromdenicklefication.Furthermore, solution analysis proves that the alloy dissolvesshowing a copper/ nickel ratio in solution which approximationcomplete that of the alloy surface . Two types of pitting corrosionwere recorded at 2 and 4 M LiBr, the first one was recorded after Ip1while the second is recorded after +1000mV. Except theconcentration of 2 and 4 M the first one only of pitting whichrecorded after Ip1 were observed beside the general dissolutionthrough the partially soluble Cu2(OH)3Br.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
833
850
https://ejchem.journals.ekb.eg/article_1471_9b52c28c76df22e65462a856357d2f63.pdf
dx.doi.org/10.21608/ejchem.2016.1471
Effect of Some Prepared Superplasticizers (Cyclohexanone Based) on Compressive Strength and Physico-chemical Properties of Oil Well Cement Pastes
text
article
2016
eng
TWO different superplasticizers particularly Cyclohexanone formaldehyde sulfanilate (CFS) and Cyclohexanone glyoxylic sulfanilate (CGS) were prepared; also, their effect on mechanical and physico-chemical properties of oil well cement was assessed. The chemical structures were affirmed by FTIR technique. The designed chemical compounds were predestined as superplasticizers for cement pastes. The pastes made by superplasticizers (CFS or CGS) addition to cement by the ratios of 0, 0.25, 0.50, 0.75, and l.00 as mass % of cement. The consistence water, setting time, chemically combined water content (Wn), the hydration rate and compressive strength of the admixed hardened pastes were predestined at various time periods. The phase composition was intended by DSC and XRD techniques. The results revealed that as the admixture dose rate increases the demand cement paste water of consistency decreases. Also, as the admixture addition rate increases the chemically combined water content decreases, so the rate of hydration decreases; meanwhile compressive strength magnitudes increase in accounts for the low water/cement (initial porosity) of the sample.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
851
866
https://ejchem.journals.ekb.eg/article_1479_9988f4ffe84cf05228bf88fe7e6b32ef.pdf
dx.doi.org/10.21608/ejchem.2016.1479
Synthesis, Thermolysis, Photolysis and Antimicrobial Evaluation of some Novel Semicarbazones and Thiosemicarbazones Derived from 3-Methyl-2- benzothiazolinone Hydrazone
text
article
2016
eng
REACTION of 3-methyl-2-benzothiazolinone hydrazone (1) with...... some selected isocyanate and isothiocyanate reagents 2a−j gavethe respective semicarbazones and thiosemicarbazones 3a−j.Thermolysis of compound 3a under reduced pressure gaveN,N`−diethylurea (4) in addition to 1,2-bis(3-methylbenzo[d]thiazol-2(3H)-ylidene)hydrazine (5). Compound 3a was almost quantitativelyrecovered upon its exposure to sunlight in methanol for 60 days.Elementary and spectroscopic measurements (IR, 1H NMR, 13C NMR,MS) are in good accord with the structures postulated for the newcompounds. The single crystal X-ray crystallographic analysis of 3fwas given and its data were discussed. The synthesized compounds 3ajas well as the hydrazone 1 were screened for their antibacterialproperties against Bacillus subtilis (G+), Escherichia coli (G-),Pseudomonas aeruginosa (G-) and Staphylococcus aureus (G+) andfor their antifungal properties against Aspergillus flavus and Candidaalbicans. Some of the tested compounds showed an activity against thefour bacterial strains where their order of activity was found to be 1 >3g > 3j > 3i > 3e > 3h > 3a. The MIC90 value of compound 1 againstP. aeruginosa was 9 mg/ml. On the other hand only compound 1showed a significant activity against A. flavus fungal species where itrecorded an inhibition zone diameter value (16 mm/mg) which is verynear to that of the standard drug, amphotericin B (17 mm/mg).However, the C. albicans was found to be insensitive to all of theinvestigated compounds.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
867
885
https://ejchem.journals.ekb.eg/article_1483_b8c49ca3c6cfc3b63307d5e14d4a6ec5.pdf
dx.doi.org/10.21608/ejchem.2016.1483
Novel Route for Antibacterial Finishing of Cotton Fabric Based on Ag Loaded Cyclodextrin –PAN Copolymers
text
article
2016
eng
HEREIN, we represent a novel route for antibacterial finishing of cotton fabric. The novelty involves preparation of cyclodextrins based copolymers which are applied along with silver nitrate to yield silver nanoparticles (AgNPs). The latter are intermediately associated with the copolymer which is distributed in the fiber-fabric structure. In a more specific sense, the present work comprises three main studies 1) Synthesis of novel finishes based on graft copolymerization of β-cyclodextrin (β-CD) and reactive cyclodextrin (RCD) with acrylonitrile AN,2) characterization of obtained copolymers and 3) application of these copolymers along with AgNO3 to cotton fabric to ultimately create Ag NPs in the fiber-fabric structure. In the first study optimal condition of the synthesis of said copolymers were established. The second study was devoted to monitoring nitrogen content, graft yield percent and grafting efficiency percent. The third study emphasized the application of the copolymer in presence of silver nitrate which is converted to AgNPs under the copolymer dual reducing and stabilizing action. The copolymers containing AgNPs were embedded within the cotton fabric and imparted to it thermal stability along with antibacterial properties .It was also found that using RCD as a base for copolymerization with AN displays higher effects in terms of nitrogen content, graft yield, than β-CD.
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
887
910
https://ejchem.journals.ekb.eg/article_1553_b444bab418838a485c6877fcde5a4584.pdf
dx.doi.org/10.21608/ejchem.2016.1553
Synthesis and Characterization of MEH-PPV for Solar Cell Application
text
article
2016
eng
POLY [2- methoxy -5 -( 2'- ethylhexyloxy) - (p - phenylenevinylene)] ……(MEH-PPV) was prepared via Gilch route. The structures of MEH-PPV were fully confirmed with their respective spectroscopic data using 1H and 13C nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopies. Thermal properties of the polymer were studied using simultaneous Thermo-Gravimetric and Differential Scanning Calorimetry (TGA/DSC) analyses. The number average molecular weight Mn of the prepared MEH-PPV was measured by Gel permeation chromatography (GPC) technique. To investigate the physical properties of the prepared MEH-PPV, two polymer samples were dissolved in two different organic solvents (THF and Chlorobenzene CB) and sprayed as a film on top of the glass and KBr substrates at 150 oC. The dissolved MEH-PPV polymer in THF was sprayed onto ZnO nanowires that grown on FTO glass substrate by two step method. The constructed solar cell showed better performance compared with previous cell that based on sprayed MEH-PPV / sprayed ZnO nanorod/TCO glass
Egyptian Journal of Chemistry
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRT
0449-2285
59
v.
5
no.
2016
911
933
https://ejchem.journals.ekb.eg/article_1554_944058a4d2ca9ccb16ab955a2f429276.pdf
dx.doi.org/10.21608/ejchem.2016.1554