National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Synthesis, Spectroscopic and Thermal Behaviour of Salicylaldimine Complexes329339122410.21608/ejchem.2010.1224ENJournal Article20091119THE COMPLEXES of N-salicylaldimine 2-urea (L <span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">1</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">) and N-salicylaldimine-2-thiourea (L</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">2</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">) with Fe(III), Co(II), Ni(II) and Cu(II) are formed in the molar ratios (1:1) as well as (1:2) (M:L) and characterized by elemental analysis, IR, electronic spectra, thermogravimetric analysis and magnetic measurements. The stoichiometry, proton-reagent stability constant, conditional formation constant of the complexes and the conductance are determined by using potentiometric and conductometric measurements. The study revealed that the ligands behave as monobasic bidentates, electronic spectra and magnetic measurements indicate that the metal chelates have octahedral or square-planar arrangements. Also, the TG analysis indicates the presence of hydrated and coordinated water molecules. The electrolytic and nonelectrolytic nature of the complexes were assigned based on molar conductance measurements.</span></span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Enhanced One-Pot Microwave Efficient Synthesis of Some Pyrrolidine-2, 5-Diones, Butenamides and their Sulfonamide Derivatives Versus Conventional Thermal Heating Technique341357122510.21608/ejchem.2010.1225ENJournal Article20100124
<span style="font-size: xx-small;">DUE TO the highly important medical applications and wide biological activities of pyrrolidines, butenamides, and their sulfonamide derivatives, such as bacteriocides, fungicides, and insecticides, compounds (4-42) were synthesized from condensation of α, β-unsaturated anhydrides (1-3), with the corresponding amines, using either enhancing microwave irradiation heating or the conventional thermal heating technique in order to compare between their efficiency. </span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Synthesis of Some New Thieno [2, 3-d] pyrimidines359366122610.21608/ejchem.2010.1226ENJournal Article201003294IMINO-3N- (substituted) -5-(thiophen-2-yl) -3,4,dihydro-thieno [2,3-d] pyrimidine-2(1H) (2) was used as precursor for the preparation of some novel 1-(2,3-dihydro-3-methyl-5-(thiophen-2-yl)-2-thioxothieno[2,3-d] pyrimidine <span style="font-family: Times New Roman; font-size: xx-small;" lang="JA"><span style="font-family: Times New Roman; font-size: xx-small;" lang="JA">– </span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">4 (1H)-ylidene) -3-methyl or phenylthiourea (3a,b) and also for the preparation of 2-Hydrazinyl -3-methyl-5- (thiophen-2-yl)- thieno [2,3-d] pyrimidin-4(3H-imine) (5) which was reacted with methyl and phenylisothiocyanat at room temp. to give compounds 6a,b. Also, 5 was reacted with methylisothiocyanate, and / or formic acid to give the triazolopyrimidines 7 and 8. Also, 5 was reacted with nitrous acid to give the 2-azido thienopyrimidine 9.</span></span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Effect of Water Content Chemical Composition and Antioxidant Activity from Volatile Generated from Beef Fat in Maillard Reaction367383122710.21608/ejchem.2010.1227ENJournal Article20100823THE PRESENT work was aimed to examine the chemical composition and antioxidant activity of the reaction between beef fat and cysteine with and without water model systems. Fifty two and thirty three volatile compounds were isolated and identified with the predominance of esters and sulfur-containing compounds. Sensory evaluation was also performed for the model systems according to (ISO) and the results revealed that the presence of volatiles having roasted meat <span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">–</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">like aroma might be due to certain components such as pyrazine and thiazoles derivatives as the main compounds. The radical scavenging activity of the model systems was quantified spectrophotometricall</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">y, using DPPH radical and β</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">-carotene bleaching assays.</span></span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Synthesis of New Bithiophene and Thieno [2,3-d] Pyrimidine Derivatives with Potent Antimicrobial Activity385401122910.21608/ejchem.2010.1229ENJournal Article20100412
<span style="font-size: xx-small;">THE VERSATILE synthon 2-Amino-4-(thiophene-2-yl) thiophene-3-carbonitrile (1) was used as precursor for the synthesis of a series of bithiophene (2) and thieno [2, 3-</span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">d</span></span></em><span style="font-size: xx-small;">] pyrimidine (3) derivatives. The antimicrobial evaluations of the newly synthesized compounds were carried out in vitro assays for antifungal and antibacterial activities. Amongst the tested compounds, 1-(4</span><span style="font-size: xx-small;">\</span><span style="font-size: xx-small;">-cyano-2,3</span><span style="font-size: xx-small;">\</span><span style="font-size: xx-small;">-bithiophen-5</span><span style="font-size: xx-small;">\</span><span style="font-size: xx-small;">-yl)3-phenylthiourea (2b), 4-imino-3-phenyl-5-(thiophenyl-2-yl)-3,4-dihydrothieno[2,3-</span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">d</span></span></em><span style="font-size: xx-small;">] pyrimidine-2(1</span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">H</span></span></em><span style="font-size: xx-small;">)-thione (3b) and 1-phenyl-3-(5-(thiophenyl-2-yl)thieno[2,3-</span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">d</span></span></em><span style="font-size: xx-small;">]pyrimidin-4-yl) thiourea (5c) exhibit significant antibacterial activities against </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Pseudomonas sp</span></span></em><span style="font-size: xx-small;">, </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Escherichia coli</span></span></em><span style="font-size: xx-small;">, </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Streptococcus lactis</span></span></em><span style="font-size: xx-small;">, </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Bacillus subtilis </span></span></em><span style="font-size: xx-small;">and exhibit significant antifungal activities against </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Aspergillus niger</span></span></em><span style="font-size: xx-small;">, </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Penicillium sp, Candida albicans </span></span></em><span style="font-size: xx-small;">and </span><em><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">Rhodotorula ingeniosa. </span></span></em><span style="font-size: xx-small;">From structure-activity relationship (SAR) point of view, the attachment of phenyl thioureido moiety to bithiophenes can be considered as a breakthrough in developing a new therapeutic antimicrobial agents related to bithiophene system. </span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Corrosion Inhibition of Copper and Its Alloys Using Benzotriazole403415123110.21608/ejchem.2010.1231ENJournal Article20100503THIS paper investigates the effect of benzotriazole (BTAH) on the corrosion of copper and two of its alloys namely; Cu-10Ni and Cu-37Zn brass alloys in 3.5 % NaCl solution. Potentiodynamic polarization, potentiostatic polarization and electrochemical impedance spectroscopy (EIS) techniques were used in this investigation. Surface morphology was examined by using scanning electron microscopy (SEM). At lower concentration of BTAH (0.001 M) copper and brass showed slightly better behavior than CuNi while <span style="font-family: Times New Roman; font-size: xx-small;" lang="JA"><span style="font-family: Times New Roman; font-size: xx-small;" lang="JA">at high concentration (≥ 0.005 M) the Cu</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">-10Ni alloy showed excellent inhibition efficiency compared to copper and brass. EIS showed that the polarization resistance, R</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">p</span></span><span style="font-family: Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman; font-size: xx-small;">, and hence the corrosion resistance is increased with the addition of BTAH. Results are supported by surface investigations.</span></span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Synthesis and Structural Characterization of Lithiated and Delithiated LiCoO2 Using Different Chelating Agents417434123210.21608/ejchem.2010.1232ENJournal Article20100516
<span style="font-size: xx-small;">LAYERED LiCoO</span><span style="font-size: xx-small;">2 </span><span style="font-size: xx-small;">was synthesized by sol-gel method using ……succinic, malic and tartaric acid as chelating agent. The delithiated Li</span><span style="font-size: xx-small;">x</span><span style="font-size: xx-small;">CoO</span><span style="font-size: xx-small;">2 </span><span style="font-size: xx-small;">oxide was obtained by chemically extracting lithium from the corresponding LiCoO</span><span style="font-size: xx-small;">2 </span><span style="font-size: xx-small;">with the oxidizer K</span><span style="font-size: xx-small;">2</span><span style="font-size: xx-small;">S</span><span style="font-size: xx-small;">2</span><span style="font-size: xx-small;">O</span><span style="font-size: xx-small;">8</span><span style="font-size: xx-small;">. X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electronic Microscope (TEM), Fourier Transform Infra-Red (FTIR), and Raman Scattering (RS) were used for characterization of the lithiated and delithiated phase. It shows that the samples obtained are layered LiCoO</span><span style="font-size: xx-small;">2 </span><span style="font-size: xx-small;">with the α-NaFeO</span><span style="font-size: xx-small;">2 </span><span style="font-size: xx-small;">structure. All the samples are homogenous and the particle size can be easily controlled by the preparation temperature. Upon lithium deintercalation from the host material, two different phases can be found. </span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Synthesis and Conformational Analysis of Some Erythropoietin Mimetic Peptides Using Microwave Energy435448123310.21608/ejchem.2010.1233ENJournal Article20100622
<span style="font-size: xx-small;">THE CURRENT study describes the synthesis of Erythropoietin- ......which is a prohibited hormone by WADA-mimetic peptides </span><strong><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">[</span></span></strong><span style="font-size: xx-small;">(AFIII54(chain I), (Ser)</span><span style="font-size: xx-small;">12</span><span style="font-size: xx-small;">AFIII54(chain II), AFIII54 with addition of Gly and Tyr in position 4 and 5, respectively (chain VI), AFIII54 devoid (Thr)</span><span style="font-size: xx-small;">9 </span><span style="font-size: xx-small;">and )Trp)</span><span style="font-size: xx-small;">10 </span><span style="font-size: xx-small;">(chain VII), (EMP3(chain III),(Ser)</span><span style="font-size: xx-small;">15</span><span style="font-size: xx-small;">EMP3 (chain IV), (Ala)</span><span style="font-size: xx-small;">15</span><span style="font-size: xx-small;">EMP3(chain V), EMP3 with addition of Gly and Tyr in position 7 and 8, respectively (chain VIII) and EMP3 devoid (Thr)</span><span style="font-size: xx-small;">12</span><span style="font-size: xx-small;">and (Trp)</span><span style="font-size: xx-small;">13</span><span style="font-size: xx-small;">(chain IX) </span><strong><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">] </span></span></strong><span style="font-size: xx-small;">by SPPS using microwave energy which accelerated reaction rate and improved the purities and yield. </span>
Conformational analysis using FT-IR spectroscopy showed that most the synthesised peptides existed in α-helix structure
<strong><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;"><span style="font-family: Times New Roman,Times New Roman; font-size: xx-small;">. </span></span></strong><span style="font-size: xx-small;">Also, biological activity for one of these sequences was studied. </span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Utilization of Synthetic Zeolite for Removal of Anionic Dyes449464123410.21608/ejchem.2010.1234ENJournal Article20100714
<span style="font-size: xx-small;">THE REMOVAL performance of highly colored soluble organic pollutpollutants in water has been investigated. Comparative adsorption studies of some anionic dyes on commercially zeolite X and zeolite X powder prepared from Egyptian kaolin have been studied. Brilliant blue FCF (BL), brilliant black PN (BB), eriochrome black T (EBT) and ponceau 3R (P3R) were introduced as models for organic pollutants of different structures. For comparison, the properties of the synthetic zeolite and commercial grade zeolite, such as crystallinity, thermal stability and cation exchange capacity using XRD, DSC and atomic absorption spectroscopy, respectively were conducted. UV/visible spectroscopic measurements have been used to determine the amount of adsorbed dyes by zeolites. The adsorption capacities for batch method were recorded. The influential parameters, such as initial pH value of the solution, temperature, adsorbate concentration and ion exchange on the adsorption process were studied. The suitability of Langmuir and Freundlich isotherms to the equilibrium data was investigated in the solid-liquid system. In all the adsorption experiments, the variation of adsorption capacities were recorded and explained in terms of both zeolite behaviour and dyes structures. Attempts to regenerate the adsorbents physically (at high temperature) were also made and the adsorptive properties of the recovered zeolite have been provided. </span>National Information and Documentation Centre (NIDOC), Academy of Scientific Research and Technology, ASRTEgyptian Journal of Chemistry0449-228553320100630Synthesis and Characterization of Carbon Nanotubes Using Amorphous Alloy Catalysts465475124210.21608/ejchem.2010.1242ENJournal Article20100104
<span style="font-size: xx-small;">ARC DISCHARGE method was utilized to synthesize carbon nanotubes ….. (CNTs). The arcing was carried out in air atmosphere in presence of amorphous alloy as catalyst. The current density was maintained constant during the experiment. The amorphous alloys used were CoFeB amorphous alloy and ZrCuNiAl amorphous alloy. Characterization of the samples produced indicates that the presence of CoFeB amorphous alloy much enhanced the yield of multiwall carbon nanotubes (MWNTs). In contrast, the use of ZrCuNiAl amorphous alloy exerted an opposite effect. The produced MWNTs were tested for hydrogen sorption at 20 bar. </span>