Synthesis, crystal structure, and antiviral evaluation of new imidazopyridine-schiff base derivatives: and anti-HIV studies.

A series of Imidazo[1,2-]pyridine-Schiff base derivatives were synthesized and characterized using H NMR, C NMR, Mass Spectrometry and FTIR techniques, and the structure of 4a was further confirmed through single-crystal X-ray diffraction analysis. Density Functional Theory (DFT) has been used to investigate the structural and electronic properties. The synthesized compounds were evaluated for their antiviral activity against human immunodeficiency virus type-1 (HIV-1) and human immunodeficiency virus type-2 (HIV-2) in MT-4 cells.

The effects of Sr-substitution in BaSmTiNbO ceramics: structural study, optical properties, and complex impedance spectroscopy.

Ceramics of (BaSr)SmTiNbO, denoted as BSSTN ( = 0, 0.25 and 0.5), were synthesized by the conventional solid-state reactions route.

Effect of sodium substitution by yttrium on the structural, dielectric and electrical properties of BaNaYNbO ceramics.

The effects of Na substitution by Y on the structural, microstructural, dielectric and electrical properties of BaNaYNbO compositions with (x = 0, 0.02 and 0.04) have been studied in detail.

Dissolution mechanism of cellulose in a benzyltriethylammonium/urea deep eutectic solvent (DES): DFT-quantum modeling, molecular dynamics and experimental investigation.

In this paper, a benzyltriethylammonium/urea DES was investigated as a new green and eco-friendly medium for the progress of organic chemical reactions, particularly the dissolution and the functionalization of cellulose. In this regard, the viscosity-average molecular weight of cellulose () during the dissolution/regeneration process was investigated, showing no significant degradation of the polymer chains. Moreover, X-ray diffraction patterns indicated that the cellulose dissolution process in the BTEAB/urea DES decreased the crystallinity index from 87% to 75%, and there was no effect on type I cellulose polymorphism.

Structural, electrical, and dielectric study of the influence of 3.4% lanthanide (Ln = Sm and La) insertion in the A-site of perovskite BaLnTiZrO.

This paper presents a systematic study of the substitution effect by lanthanides (Ln = Sm and La) in the A-site of perovskite BaLn(TiZr)O with a substitution rate equal to 3.4%. All samples were synthesized by the classical solid-state reaction route and characterized by X-ray diffraction and a complex impedance spectroscopy technique.

Environmental-Friendly Adsorbent Composite Based on Hydroxyapatite/Hydroxypropyl Methyl-Cellulose for Removal of Cationic Dyes from an Aqueous Solution.

The aim of this study is to develop a new, efficient, and inexpensive natural-based adsorbent with high efficacy for the cationic dye methylene blue (MB). A natural-based nanocomposite based on hydroxyapatite (HAp) and hydroxypropyl methylcellulose (HPMC) was selected for this purpose. It was synthesized by the dissolution/reprecipitation method.

Impact of rare earth (RE = La, Sm) substitution in the A site perovskite on the structural, and electrical properties of Ba(ZrTi)O ceramics.

Undoped Ba(ZrTi)O and rare-earth-doped (Ba RE)(ZrTi)O (RE = La, Sm) perovskite compounds were synthesized by the conventional solid-state reaction route. Both solubility of rare earth in Ba(ZrTi)O and formation of perovskite structure with the 3̄ space group were verified by the Rietveld method using X-ray diffraction data. SEM micrographs of all ceramics revealed high densification, low porosity, and even homogeneous grain distribution of various dimensions over the total surface.

New benzyltriethylammonium/urea deep eutectic solvent: Quantum calculation and application to hyrdoxylethylcellulose modification.

In this paper, a new deep eutectic solvent (DES) has been successfully synthesized that is based on benzyltriethylammonium bromide as a hydrogen bond acceptor (HBA) and urea as a hydrogen bond donor (HBD). However, its usability in modifying cellulose derivatives, especially acylating hydroxyethylcellulose (HEC) was investigated. The chemical modification (acetylation) of HEC was carried out in BTEAB/urea DES system without any additional conventional solvent or catalyst.

Structural, dielectric and impedance spectroscopy analysis of BaCaTiZnNbO ferroelectric ceramic.

In this work, Zn co-doped tungsten bronze having nominal formula BaCaTiZnNbO has been synthesized and systematically studied for structure, dielectric and electrical properties. The formation of the phase of tetragonal tungsten bronze with space group 4 and the occurrence of oxygen vacancies were verified by the Rietveld refinement using X-ray diffraction data. Scanning electron microscopy (SEM) of BaCaTiZnNbO ceramic shows high densification, low porosity, and homogeneous distribution of grains of different sizes over the total surface.

New quaternized cellulose based on hydroxyethyl cellulose (HEC) grafted EDTA: Synthesis, characterization and application for Pb (II) and Cu (II) removal.

In this paper, new quaternized cellulose derivative based on Ethylenediaminetetraacetic acid (EDTA) and hydroxyethyl cellulose (HEC) is successfully prepared in homogeneous medium. The resulted product is characterized using spectroscopy techniques (FTIR, H NMR and C NMR). At the supramolecular level, the x-ray patterns show that a high hydrogen bond density occurs by grafting EDTA on the HEC fibers.