Inorganic Chemistry Research
Volume:4 Issue: 1, Jul 2020

Dibenzothiophene (DBT), benzothiophene (BT) and thiophene (T) were catalytically oxidized to their corresponding sulfone products by H2O2 in the presence of magnetically recoverable polyoxometalate-based nano catalyst. Different extracting solvents including ethanol, acetonitrile, and dimethylformamide were tested. The best results were obtained by ethanol extraction. The oxidative desulfurization (ODS) of model oils was investigated using different sulfur levels (100-1000 ppm). The removal of DBT could reach >99% and the sulfur content would be reduced from initial 100 to lower than 1 ppm, which can meet the standards of deep desulfurization. Two main aspects including the effects of nitrogen containing compounds and aromatic compounds on ODS of model oil were studied. Effect of indole, quinoline, toluene, xylene, mesitylene and naphthalene in ODS conversion were investigated. The catalyst could be easily separated from the reaction mixture using an external magnetic field, demonstrated an effective and simple separation method, and reused several times without significant change on ODS results.

A new one-dimensional uranium(VI) coordination polymer, [UO2(μ-DMP)2(TMP)]n (1) (DMP is dimethyl phosphate and TMP is trimethyl phosphate), was prepared from the reaction of UO2(NO3)2.6H2O and TMP in in THF (THF is tetrahydrofuran) as a solvent. Suitable crystals of this complex for crystal structure determination were obtained by slow evaporation of the produced yellow solution at room temperature. Complex 1 was characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. The X-ray structural analysis indicated that the uranium(VI) is seven-coordinated in a pentagonal bipyramidal configuration by two axial uranyl oxygens, four bridged dimethyl phosphate and monodentate trimethyl phosphate ligands. Also, the thermal stability of 1 was studied by thermogravimetric and differential thermal analyses.

A new two-dimensional manganese(II) coordination polymer, [Mn(μ-DEP)(μ-Cl)(H2O)2]n (1) (DEP is diethyl phosphate), was prepared from the reaction of MnCl2.4H2O and TEP (TEP is triethyl phosphate) ligand in mixture of H2O/CH3OH (1:10) at 40 °C. Suitable crystals of this complex for crystal structure determination were obtained by slow evaporation of the produced colorless solution at room temperature. Complex 1 was characterized by elemental analysis, IR spectroscopy and single-crystal X-ray diffraction. The X-ray structural analysis indicated that the manganese(II) is six-coordinated in a distorted octahedral configuration by four oxygen atoms from two water and two bridged diethyl phosphate ligands and two bridged chloride anions. Also, the thermal stability of 1 was studied by thermogravimetric and differential thermal analyses.

The aim of this research is to develop new mordants and a wide range of colors for natural dyeing of silk. In this study, two new erbium(ΙΙΙ) complexes, [Er(AO)(H2O)7](OAc)3 and [Er(AMH)(H2O)6](OAc)3 (AO = acridine orange, AMH = azomethine-H, and OAc = acetate anion), were synthesized, characterized and used as a mordant for the natural dyeing of silk yarns with an aqueous extract of green walnut husk. The mordanting method and the effective dyeing parameters including the quantity of the dye material, the pH and temperature of the dyeing bath, the mordant concentration, and the dyeing time were carefully optimized. The colorimetric properties (L*, a*, b*, and K/S) and color fastness characteristics (light and wash) of the dyed samples were also investigated. The mordanted silk yarns with synthesized erbium(ΙΙΙ) complexes were compared to unmordanted dyed samples as well as mordanted dyed samples only with simple salts including starting erbium salt (erbium(ΙΙΙ) acetate), stannous chloride, and aluminum potassium sulfate. The results indicated that the dyeing of silk in the presence of [Er(AO)(H2O)7](OAc)3 as the mordant provides the highest color difference, whereas the treated silk with [Er(AMH)(H2O)6](OAc)3 shows the most color strength value (K/S). Furthermore, all of the mordanted and unmordanted samples exhibited proper color fastness characteristics.

A highly efficient Ullmann homocoupling reaction of aryl halides using palladium (II) phosphine-ylide complexes as homogenous pre-catalysts under aerobic conditions has been developed without the need for any chemical co‐reducing agents. The procedure is relatively mild and appears to have broad applicability, being useful for the homocoupling of both electron-deficient and electron-rich aryl halides and also homocoupling of phenylboronic acid and phenylacetylene.

The new heterogeneous catalyst based on MoO2(acac)2 immobilized on superparamagnetic nanoparticle functionalized with dendrimer was synthesized. The dendrimer with amine and sulfur functional groups offer proper positions for a strong connection between MoO2(acac)2 and support. The synthesized catalyst was characterized by FT-IR spectroscopy, ICP, TGA, SEM, TEM, and XRD. This catalyst showed high activity in the epoxidation of alkene with tert-BuOOH. These reactions displayed the best performance in the present of 1,2-dichloroethan as a solvent and 0.0108 mmol of the catalyst. The use of magnetic nanoparticles (MNPs) as support facilitates the separation of the catalyst from the reaction media by simple magnetic decantation. Eventually, the catalyst can be recovered and reused without a decrease in its catalytic activity and significant Mo leaching for five times.

In this research, self-assembled copper sulfide nanospheres were synthesized by the solvothermal method and the effects of reaction parameters, including reaction time and reaction temperature on the morphology and phase evolution of copper sulfide nanostructures were investigated. For the identification of copper sulfide nanostructures, X-ray diffraction (XRD), infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), and elemental analysis (EDX) were used. The results showed that the temperature of 200 °C for 24 h is sufficient for the formation of the pure hexagonal Cu7.2S4 phase. The Cu7.2S4 nanostructures have a spherical morphology that formed from the self-assembly of the nanoparticles. Finally, the photocatalyst efficiency of Cu7.2S4 sphere was investigated.

A symmetric complex [NiL2(H2O)2]Cl2, where L = 2-picolylamine was synthesized and characterized by spectroscopic and structural methods. Single crystal X-ray studies reveal that the Ni(II) center located in a pseudo-octahedral N4O2 environment with bidentate ligands L positioned in basal and two water molecules in the apical position. The complex is solvatochromic, ionochromic and thermochromic. The observed positive solvatochromism in polar solvents is due to the substitution of water molecules by the solvent. The complex demonstrated distinct ionochromism towards cyanide and bromide anions in the presence of other halides and pseudo-halide anions and can be served as a ‘‘naked-eye’’ indicator for the qualitative detection of these anions. The compound showed reversible thermochromism in solid-state from blue to green due to dehydration and hydration process.

Oxovanadium(IV), manganese(II) and copper(II) complexes of a Schiff base ligand derived from 2,4-dihydroxyacetophenone and 1,2-diaminocyclohexane have been encapsulated in the nanocavity of zeolite-Y by flexible ligand method and characterized by metal analysis, IR spectroscopic studies and X-ray diffraction patterns. The encapsulated complexes abbreviated here as CuL-Y, MnL-Y and VOL-Y catalyze the oxidation of various olefins using tert-butyl hydroperoxide (TBHP) as oxidant in good yield (α-methyl styrene: 75%). The catalytic activity of the encapsulated Schiff base complexes decreased in the order CuL-Y > VOL-Y > MnL-Y.

To model the active layer in the hetero-junction solar cells, the C60, C70, PC60BM, PCBDAN fullerenes as acceptor, and (OS)n=1) oligoselenophenes as donor were considered. The (OS)n=14/C60, (OS)n=14/C70, (OS)n=14/PC60BM, and (OS)n=14/PCBDAN blends as a model of the active layer in the BHJ solar cell were chosen, and the optoelectronic properties were studied. The calculated efficiency of these complexes based on the Scharber diagram is 8%, 8.2%, 9.3%, and 9.7%, respectively. These results indicate that the (OS)n=14/PCBDAN blend is a favorable candidate as solar cell than that of the other blends. In order to investigate the effect of the chain length of oligomers on the solar cell properties, the optoelectronic properties of (OS)n=12/C60 blend was also studied. The electronic and optical properties and the calculated efficiency values of (OS)n=12/C60 and (OS)n=14/C60 (7.7% and 8% respectively) show that the (OS)n=14/C60 complex is more suitable candidate than the (OS)n=12/C60 complex for modeling the active layer in the BHJ solar cells.

In this paper, we have reported removal of Bisphenol A (BPA) by Hydroxyapatite/NaP zeolite (HAp: Zeolite ) nanocomposite which synthesized in previous our work and characterized by using different methods such as X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscope, Energy Dispersive X-ray analysis, surface area, and thermogravimetric analysis. To investigate the purification performance for removal BPA batch experiments were used. The results showed that the removal capacity could reach an equilibrium value of 11.125 mg/g in the initial BPA concentration of 50 mg/L. Some parameters such as initial concentration, pH, contact time, adsorbent dosage, and the temperature were studied that result shows this nanocomposite have high capacity for adsorption of BPA. The kinetic study presented that it agreed well with the pseudo-second-order model (R2= 0.994). Furthermore, thermodynamics studies were carried out, and result showed an exothermic condition for adsorption process. An artificial neural networks (ANNs) model was developed to predict the performance removal process based on experimental information which shows an association between the predicted results of the designed ANN model and experimental data. Results showed that the neural network model predicted values are found in close agreement with the batch experiment result with a correlation coefficient (R2) about 0.99051 and mean squared error 0.005938.

In a systematic effort to identify a potent antiproliferative agent, four complexes of vanadium containing maltol and deferiprone ligands were synthesized and evaluated for their cytotoxic activity against five human and animal cancer cell lines, including human breast cancer cells (MCF-7), human cervix epithelial carcinoma (HeLa), human colon cancer cell line (HT-29), human leukemia cell line (K-562), and mouse neuroblastoma cell line (Neuro-2a) using cisplatin as a comparative standard by the MTT assay. The results revealed that the vanadium complexes induce apoptosis in cancer cell lines. The flow cytometry results confirmed that complex 4 exhibits a high population of apoptotic cells (65.8%) and 2-fold higher than cisplatin (32.1%) at the same concentration and induces apoptosis of K-562 cancer cells.