Journal of Applied Organometallic Chemistry
Volume:2 Issue: 3, Aug 2022

In this study, an amide-functionalized metal-organic framework, namely TMU-24 was selected to adsorb Co(II) from wastewater with an adsorption capacity of 500 mg. g-1 in less than 20 minutes in neutral pH (pH=7). The effect of diverse parameters such as adsorbent dosage, competitive ions, and contact time on the adsorption process was investigated to find the optimal amounts of them. Also, the modeling calculations demonstrated that this compound obeys Pseudo-Second-order and Langmuir models with correlation coefficients of R² = 0.9996 and R² = 0.9761, respectively. So, the adsorption mechanism could be monolayer chemical interaction according to these models. Moreover, PXRD patterns of the framework before the adsorption procedure and after that revealed that the MOF could keep its structure, suggesting the stability of the framework. So, we can claim that our proposal adsorbent is a promising candidate for cobalt(II) removal from pollutant water.

Scutellaria is widely used in traditional medicine as a medical plant, in Asian countries, especially in China. It has been applied in treatment because of its sedative, antithrombotic, anti-inflammatory, antioxidant, and antiviral effects. Scutellaria condensata Rech. f. subsp. pycnotricha (Rech. f.) Rech. f. is a wild perennial plant which  grows in Iran. In this study, GC-FID and GC-MS were used to examine the hydro-distilled volatile oil from the aerial parts of S. condensate. The total phenolic and flavonoids contents were determined by spectrophotometer. Also, the evaluation of antioxidant activity of essential oil and the methanolic extract was carried out using DPPH assay. The antibacterial activity of S. condensate essential oil was examined against four Gram-negative and five Gram-positive bacteria. Additionally, the review evaluation of volatile oil compounds of Scutellaria species was done. The process led to the identification of thirty-two compounds constituting 96.5% of the volatile oil. The major constituents were found to be linalool (25.3%), carvacrol (16.3%), and (E)-caryphyllene (13.4%). As a result, the highest scavenging activity belonged to methanolic extract (IC50= 38.2 µg/ml), followed by essential oil (IC50= 93.2 µg/ml). The total phenolic and flavonoid content were (120.7 mg GAE/g sample) and (78.6 mg QE /g sample), respectively for the methanolic extract. The essential oil showed moderate to high inhibitory activity against the Bacillus cereus, Escherichia coli, Staphylococcus epidermidis and Bacillus pumilus. The study indicates S. condensate potential for being a prospective antioxidant and antibacterial source in pharmaceutical and food industries.

In this work, 5,6,7,8-Tetrabromo-2,3-dihydro-2,3-bis(2-hydroxyethyl)phthalazine-1,4-dione is synthesized by the reaction of 5,6,7,8-tetrabromo-2,3-dihydrophthalazine-1,4-dione with 2-bromoethanol in the presence of triethylamine. The obtained monomer was polymerized with different diisocyanates, including hexamethylenediisocyanate (HMDI), tolylene-2,4-diisocyanate (TDI), isophoronediisocyanate (IPDI), 1,4-phenylene diisocyanate (p -PDI) and 4,4'-methylenebis (phenyl isocyanate) (MDI),  to obtain polyurethanes. The measured viscosity for these polymers is in the range of 0.5-0.6 dlg-1. The structure of the synthesized polymers was analyzed by infrared (IR), 1H-NMR spectroscopy methods, viscometry measurements, thermal gravimetric analysis (TGA/DTG), as well as elemental analysis. All the polyurethanes showed very good solubility in common aprotic polar solvents. The good solubility of the polyurethanes can be due to presence of bulky pendant group as side group. The inherent viscosity of the polyurethanes in the range of 0.5 – 0.6 dL/g indicated the relatively high molecular weight. The diol synthesized here is reported for the first time, and data from different spectra analyses were used to confirm the structures of all compounds. Besides, the analysis suggests that not only the synthetized polymers have favorable polymer properties such as acceptable viscosity range and high thermal resistance, but also these polymers, due to the presence of phthalazine nucleus in their structure, may have medical applications as well.

Xanthenes have been considered in medicine and biology. Their medicinal properties include antiviral, antibacterial, anti-inflammatory, and therapeutic photodynamic activities, as well as the antagonist for paralytic action. 1,8-Dioxo-octahydroxanthenes have synthesized good yields via a reaction of aldehydes and dimedone in the presence of  cerium oxide/aluminum oxide nano-catalyst as a catalyst. High efficiency, short time and reuseability of catalyst are the advantages of this method.

The effect of the adsorbed thiophene (T) on the surface of (8,0) zigzag single walled boron nitride nanotubes (BNNTs) was studied using density functional theory calculations in the gas phase. Geometry optimizations were also carried out at the B3LYP/6-31G (d) level of theory. The Gaussian 09 suites of programs were used. The geometric optimization of (8, 0) BNNT-T was performed using the minimum energy criterion in six different configurations of the adsorbed thiophene on the nanotube. Our computer simulations have found that the preferred adsorption site of the molecule is at the end of the nanotube for the T component and all cases have physical interactions. The results showed an increase in polarity due to the proper distribution of electrons. It was also found that the reduction in global hardness, energy gap and electronic chemical potential due to thiophene adsorption leads to an increase in the stability of the (8,0) zigzag BNNT-T complex. In this study, natural bond analysis, global softness, ionization potential and electrophilicity index for nanotubes were calculated.

Some bis(3-methylphenyl)sulfoxide aza macrocycles (3–8) were synthesized in high yields based on the conventional methods of the reaction of corresponding bis(3-methylphenyl)sulfoxide diester and diamines in refluxing methanol. Bis(3-methylphenyl)sulfoxide diester was synthesized from the reaction of 2-[(2-hydroxy-5-methylphenyl)sulfinyl]-4-methylphenol and methyl chloroacetate. The structures of these compounds were confirmed using IR, 1H NMR, 13C NMR and Mass spectroscopy.