STRUCTURAL OF SUPRAMOLECULAR HYDROGEN BONDING DIOXOURANIUM (VI) COMPLEXES

The azodye ligands were synthesized from the coupling of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one with aniline derivatives and characterized by elemental analyses, IR and NMR spectroscopy. Dioxouranium (VI) complexes of the prepared ligands were characterized by elemental analyses, conductance, thermal analysis and spectral (UV, IR and NMR) results. IR spectra show that the ligands behave as a monobasic bidentate coordinating via the hydrazo nitrogen atom and CO of the pyrazole ring. Thermal studies to verify the status of water molecules inside or outside the coordination sphere of the central metal ion. The optimized bond lengths, bond angles and the calculated quantum chemical parameters for the ligands were investigated. The coordination geometries and electronic structures are determined from a framework for the modeling of the complexes. The force constants, FUO (10-8 N/Ao) and the bond lengths, RUO (Ao) have been calculated from an asymmetric stretching frequency of O-U-Ogroup

Preparation, characterization and application of synthesized thiourea formaldehyde-calcium alginate in removing of Reactive black 5

Thiourea formaldehyde calcium alginate (TFCA) composite was successfully synthesized and used for removal of Reactive black 5 dye. The synthesized composite was applied and characterized by Fourier transform infrared spectrometer (FT-IR) spectra, scanning electron microscope (SEM)/EDS, Energy Dispersive X-Ray Analysis (EDX) and X-ray diffraction (XRD). SEM and EDX analyses confirm the homogeneity of the sorbent in term of composition. Batch adsorption experiments were performed to evaluate the adsorption conditions such as pH value, dye concentration, contact time, temperature and sorbent dose, as well as the ionic strength effect. Experimental data have been modeled by using Langmuir, Freundlich, Dubinin Radushkevich (D–R) and Temkin isotherms. Kinetic adsorption data modeled using PFORE, PSORE, Morris Weber and Elovich. Thermodynamic parameters (ΔG, ΔH, and ΔS) were evaluated for the dye adsorbent systems. These data indicated an exothermic spontaneous adsorption process that kinetically followed the pseudo-second-order adsorption process, Removal of Reactive Black 5 (RB5) dye from aqueous solution the results showed that the maximum adsorption capacity was 0.02 mmol. g-1, observed at pH 1 and temperature 25 ◦C. Equilibrium adsorption was achieved within 60 min.The accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author

متراكبات الروثنيوم الثنائي والثلاثي والأوزميوم الثلاثي مع المرتبطات المعطية المتعادلة للنتروجين - نتروجين وخواصها في الاكسدة الحفزية

A number of new complexes [RunCl2 (PPh3)2L], [RumX3 (AsPh3)L] and [OsnICl3(PPh3)L'] [L= o-anthranilonitrile(anth), o-phenylenediamine(phdm), l,10-phenanthroline(phen), 2,2'-bipyridine(bipy); L' = Phen, bipy; X = Cl, Br] have been prepared. They were characterized by spectroscopic techniques and investigated by cyclic voltammetry. The ruthenium(III) complexes were found to be more efficient catalytic oxidants than those of ruthenium(II), while osmium(III) complexes showed a weak catalytic activity. In the presence of N-methylmorpholine-N-oxide as a co-6xidant, the ruthenium catalysts oxidised primary alcohols to aldehydes and secondary alcohols to ketones.تم تحضير عدد من المتراكبات الجديدة للروثنيوم الثنائي والثلاثي وكذلك الأوزميوم الثلاثي مع مرتبطات ثنائية المخلب متعادلة الشحنة من نوع النتروجين - نتروجين . وقد تم التعرف على تلك المتراكبات بالطرق الطيفية المختلفة ودرست بجهاز الفولتامتر الدائري . ووجد أن متراكبات الروثنيوم الثلاثي أكثر كفاءة كعوامل مؤكسدة حفازة للكحولات الأولية والثانوية التي تتأكسد إلى الدهيدات وكيتونات

Unlocking the Potential of NiSO4·6H2O/NaOCl/NaOH Catalytic System: Insights into Nickel Peroxide as an Intermediate for Benzonitrile Synthesis in Water

Nickel peroxide nanoparticles (NPNPs) were prepared and characterized using various techniques including transmission electron microscope (TEM), scan electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD), and FTIR spectra. The aqueous basic catalytic system NiSO4·6H2O/NaOCl/NaOH (pH = 14) was investigated for the catalytic dehydrogenation of benzylamine and parasubstituents to their corresponding nitriles at room temperature. The obtained results confirmed the formation of NiO2 nanocrystalline particles with a size of 20 nm. Benzylamine with electron-donating groups showed higher yields of nitriles compared to electron-withdrawing groups. The mechanism involved in the in situ generated NiO2 nanoparticles dehydrogenating benzylamine to benzonitrile, with the produced NiO converting back to NiO2 nanoparticles through the excess of NaOCl