National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161030Ternary Complexes of Cd(II) Involving Pyridine-2-carboxylic Acid and Biorelevant Ligands673686144310.21608/ejchem.2016.1443ENJournal Article20160519OMPLEX 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 <em>I </em>= 0<em>.</em>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<sub>-1</sub>). The relative stabilities of ternary complexes are compared with those of the corresponding binary complexes in terms of ∆ log <em>K </em>values. The concentration distribution of the complexes in solution was evaluated.National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161030Preparation and Physicochemical Characterization of Cadmium and Zinc Ferrocyanides as Catalysts and Ion Exchangers687700144410.21608/ejchem.2016.1444ENJournal Article20160323CADMIUM and zinc ferrocyanide complexes were prepared then calcined at 100, 400, 600 and 800 °C. The obtained solids were characterized using IR, XRD, N<sub>2</sub>-adsorption measurements, H<sub>2</sub>O<sub>2</sub> decomposition, and isopropanol conversion. The results showed that the diffractograms of ZnFeCN calcined at 600 -800°C consisted of ZnO, K<sub>2</sub>FeO<sub>4</sub>, ZnFe<sub>2</sub>O<sub>4</sub>, K<sub>2</sub>O-Fe<sub>2</sub>O<sub>3</sub> phases while the CdFCN complexes calcined at 600-800°C composed of K<sub>2</sub>CdO<sub>2</sub>, K<sub>2</sub>Cd<sub>2</sub>O<sub>3</sub>, K<sub>2</sub>FeO<sub>4</sub>, K<sub>2</sub>O-Fe<sub>2</sub>O<sub>3</sub> phases and Fe<sub>2</sub>O<sub>3</sub> (Maghemite phase). The S<sub>BET</sub> of CdFeCN and ZnFeCN compounds were small and decrease with increasing the calcination temperature. CdFeCN and ZnFeCN are ion exchangers for <sup>137</sup>Cs<sup>+</sup>-removal. The exchange of ion capacity remained almost unaffected by changing the concentration of HNO<sub>3</sub> 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 H<sub>2</sub>O<sub>2</sub> 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%).<br /> <br /> <strong> </strong>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520160601Characterization of Eu(III) Complex for Determination of Bumetanide in Pharmaceutical Preparations and in Biological Fluids701718144510.21608/ejchem.2016.1445ENJournal Article20160605U(III)-Acetylacetone complex 1 was prepared and characterized by elemental analysis, UV/Vis, IR, <sup>1</sup>H-NMR spectroscopy, conductance and magnetism. The spectral results indicated that the composition of this complex is [Eu(acac)<sub>2</sub>(NO<sub>3</sub>)(EtOH)<sub>2</sub>(H<sub>2</sub>O)<sub>2</sub>].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 λ<sub>ex/Em</sub> = 385/619 nm and pH 7.1. The dynamic ranges for the determination of bumetanide concentration were found from 1 x 10<sup>-11</sup> to 1 x 10<sup>-4</sup> mol L<sup>-1</sup>, and the limit of detection (LOD) and quantitation limit of detection (LOQ) are 1.6 ×10<sup>−10</sup> and 3.2 x 10<sup>-<em>9</em></sup> mol L<sup>-1</sup>, respectively.National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161030Sr-substitution Effects on La-NiO3, Sol-Gel Synthesis, Structural and Electrical Properties719729144610.21608/ejchem.2016.1446ENJournal Article20160612 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 La<sub>1-x</sub>Sr<sub>x</sub>NiO<sub>3</sub>, 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, SrNiO<sub>3</sub>, 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. National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161030Synthesis of New Heterocycles Incorporating 3-(N-phthalimidomethyl)-1,2,4-triazole as Antimicrobial Agents731744144710.21608/ejchem.2016.1447ENJournal Article20160316 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.
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<span style="text-decoration: underline;"> </span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161030Synthesis of some Polymers Containing Heterocyclic Rings Corrosion Inhibitors of Mild Steel745757145510.21608/ejchem.2016.1455ENJournal Article20170615<strong> </strong>
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.
National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161001Microemulsion Copolymerization of Methyl Methacylate and 2-Ethyl Hexylacrylate as a Binder in Leather Finishing759777144810.21608/ejchem.2016.1448ENJournal Article20160621 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 K<sub>2</sub>S<sub>2</sub>O<sub>8 </sub>as an initiator, NaHCO<sub>3</sub> 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 (<sup>1</sup>HNMR) 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.<br /> National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161030Chemical Synthesis of Some Novel 6-Aminouracil-2-Thiones and Their Glycoside Analogues779797144910.21608/ejchem.2016.1449ENJournal Article201606216-AMINOURACIL-2-THIONE (1) and its 5-bromo derivative 2 underwent alkylation yielding their respective S-alkyl products 4<sub>a-j</sub>. The reaction of compound 1 and aldehydes in the presence of chloroacetic acid afforded the respective thiazolopyrimidinyl acetamides 7<sub>a-d</sub>. The C-glycosides 8<sub>a,b</sub> and 9<sub>c-e</sub> 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.National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161031Application of Poly (Tetraflouroethylene) Grafted with Styrene/Acrylic Acid for Proton Exchange Fuel Cell799818145810.21608/ejchem.2016.1458ENJournal Article20160629AMMA irradiation was used effectively for grafting styrene<br />and …….acrylic acid onto commercial poly<br />(tetraflouroethylene) (PTFE) films with 0.5% alumina nano-particle. It<br />was found that; 40 KGy was the optimum dose to attain the maximum<br />grafting yield when the monomers ratio was 60% styrene: 40% acrylic<br />acid. The prepared membranes are characterized using FT-IR, tensile<br />strength and scanning electron microscopy. Some parameters such as<br />water uptake, ion exchange capacity and proton conductivity were<br />determined in order to examine the membranes capability for the fuel<br />cell application. The free volumes sizes were evaluated using positron<br />annihilation lifetime spectroscopy (PALS). Fuel cell performance<br />based the highest grafted yield membrane was tested onto proton<br />exchange membrane fuel cell (PEMFC). The membrane proved their<br />applicability up to 450 hr that recommend their utility from the cost<br />benefit point of view.National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161031ZnTiO3 Nanoparticles as Novel Multifunctional Finishing of Cotton Fabric819831146710.21608/ejchem.2016.1467ENJournal Article20170228MULTIFUNCTIONAL textiles, a topic which is important from<br />scientific and economic point of view will be the new direction<br />for development of fabrics and clothing. Finishing of textiles with<br />nanoparticles is a novel rout for creation of unique functions.It is<br />well known that ZnO and TiO2 possess UV-protection, antibacterial<br />and photocatalytic properties, but there is no enough information<br />concerning the similar behavior of ZnTiO3. This provokes the<br />interest to synthesize that compound and to examine its UVprotection<br />and antibacterial properties in addition to its photocatalytic<br />activity. In this study the synthesis and use of hybrid polymers<br />loaded with ZnTiO3 nanoparticles were presented. Hybrid<br />polymerused here are based on 3-glycidyloxypropyltrimethoxysilane<br />(GPTMS). ZnTiO3 nanoparticles was used to impart cotton based<br />fabric UV-protection, antibacterial and self-cleaning properties. The<br />viability of the novel finishing as UV-protection will be dictatedby<br />UV-Vis spectroscopy and byassessment of the ultraviolet protection<br />factor (UPF). The antibacterial activity of these sol-gel derived<br />hybrid materials will be researched against Gram-negative bacterium<br />Escherichia coli DSMZ 498 and Gram-positive Micrococcus lutues<br />ATCC 9341. Photocatalytic degradation (decolorization) of<br />methylene blue (MB) in both ZnTiO3 nanoparticles sol-gel solution<br />/or on the coated fabrics was evaluated. The impact of this finishing<br />technique on other fabric properties, e.g. air permeability,<br />whiteness,and stiffness will be investigatedNational Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161031The Electrochemical Behaviour of 70-30 Cu-Ni Alloy in LiBr Solutions833850147110.21608/ejchem.2016.1471ENJournal Article20170228THE BEHAVIOUR of 70-30Cu-Ni alloy has been investigated in<br />different concentrations of LiBr solutions from 10-1 to 9 M.<br />Electrochemical measurements and surface examination complemented<br />with solution analysis were carried out. The results revealed that the<br />passivation current of (Ip1) at low anodic potential (-200) is due to<br />the formation of a doped Cu2O film involving surface enrichment of<br />nickel. Increasing the anodic potential to ≥ 300 mV, after the<br />formation of a peak of anodic current maximum (Ip2) a partially<br />passive film of Cu2(OH)3 Br is formed and the surface suffered from<br />denicklefication.<br />Furthermore, solution analysis proves that the alloy dissolves<br />showing a copper/ nickel ratio in solution which approximation<br />complete that of the alloy surface . Two types of pitting corrosion<br />were recorded at 2 and 4 M LiBr, the first one was recorded after Ip1<br />while the second is recorded after +1000mV. Except the<br />concentration of 2 and 4 M the first one only of pitting which<br />recorded after Ip1 were observed beside the general dissolution<br />through the partially soluble Cu2(OH)3Br.National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161031Effect of Some Prepared Superplasticizers (Cyclohexanone Based) on Compressive Strength and Physico-chemical Properties of Oil Well Cement Pastes851866147910.21608/ejchem.2016.1479ENJournal Article20160712TWO 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.National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161031Synthesis, Thermolysis, Photolysis and Antimicrobial Evaluation of some Novel Semicarbazones and Thiosemicarbazones Derived from 3-Methyl-2- benzothiazolinone Hydrazone867885148310.21608/ejchem.2016.1483ENJournal Article20160718REACTION of 3-methyl-2-benzothiazolinone hydrazone (1) with<br />...... some selected isocyanate and isothiocyanate reagents 2a−j gave<br />the respective semicarbazones and thiosemicarbazones 3a−j.<br />Thermolysis of compound 3a under reduced pressure gave<br />N,N`−diethylurea (4) in addition to 1,2-bis(3-methylbenzo[d]thiazol-<br />2(3H)-ylidene)hydrazine (5). Compound 3a was almost quantitatively<br />recovered upon its exposure to sunlight in methanol for 60 days.<br />Elementary and spectroscopic measurements (IR, 1H NMR, 13C NMR,<br />MS) are in good accord with the structures postulated for the new<br />compounds. The single crystal X-ray crystallographic analysis of 3f<br />was given and its data were discussed. The synthesized compounds 3aj<br />as well as the hydrazone 1 were screened for their antibacterial<br />properties against Bacillus subtilis (G+), Escherichia coli (G-),<br />Pseudomonas aeruginosa (G-) and Staphylococcus aureus (G+) and<br />for their antifungal properties against Aspergillus flavus and Candida<br />albicans. Some of the tested compounds showed an activity against the<br />four bacterial strains where their order of activity was found to be 1 ><br />3g > 3j > 3i > 3e > 3h > 3a. The MIC90 value of compound 1 against<br />P. aeruginosa was 9 mg/ml. On the other hand only compound 1<br />showed a significant activity against A. flavus fungal species where it<br />recorded an inhibition zone diameter value (16 mm/mg) which is very<br />near to that of the standard drug, amphotericin B (17 mm/mg).<br />However, the C. albicans was found to be insensitive to all of the<br />investigated compounds.National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161031Novel Route for Antibacterial Finishing of Cotton Fabric Based on Ag Loaded Cyclodextrin –PAN Copolymers887910155310.21608/ejchem.2016.1553ENJournal Article20160719HEREIN, 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.National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228559520161031Synthesis and Characterization of MEH-PPV for Solar Cell Application911933155410.21608/ejchem.2016.1554ENJournal Article20160824POLY [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