An efficient protocol for the synthesis of 3,4-dihydropyrimidin-2-(1H)-one/thione derivatives via multi-component coupling reaction of aromatic aldehydes, β-ketoester and urea or thiourea under solvent-free conditions using Silica Supported Barium Chloride as a catalyst is described. All prepared compounds with melting points, IR,1H NMR and 13C NMR were identified. High yields, mild conditi...

In this work, palladium (II) chloride-supported-N-(dipyridine-2-ylmethyl)-3-(silica-magnetite)propan-1-amine (nano-Fe3O4@SiO2@dipy@PdCl2) as a new nanostructured catalyst was prepared and its structure completely studied by different techniques and then successfully tested on Heck and Suzuki reactions.

A highly efficient and general method for the synthesis of aryloylamido coumarinsderivatives by a three-component condensation of 4-hydroxycoumarin or 4-hydroxy-6-methylpyran-1-one, aryl glyoxals and benzamide in the presence of nano silica supported tin(II) chloride as a heterogeneous catalyst is established. In this method, SnCl2/nano SiO2 wasused as green and reusable catalyst. Excellent yie...

Calcium (Ca2+), strontium (Sr2+), and barium (Ba2+) are expected to exert similar chemical and pharmacological effects. The effects of barium, strontium and calcium were studied on the contractions of rat phrenic nerve-diaphragm preparations, following electrical stimulation and their interactions with nifedipine (nif) and diltiazem (DZM) were also studied. Low doses of strontium chloride (SrCl...

Barium (Ba) with CAS number 513-77-9 and atomic number 56 is a soft silvery metallic alkaline earth metal. It has a high chemical reactivity and is never found in nature as a free element. It is highly toxic upon acute and chronic exposures (Bhoelan et al., 2014). Barium has been tested for its toxicity in different studies (Llugany et al., 2000; Langdon, 1994; Akinfieva and Gerasimova, 1984). ...

We report on the synthesis of nanosized single-crystalline spherical b-Ga2O3 particles (GONP) by thermal annealing of gallium nanoparticles (GaNP), which previously has been prepared under ultrasonication. GONP displayed a spherical morphology and the particle size reflected that of GaNP. The nanoparticles have been confirmed as crystalline b-Ga2O3 by powder X-ray diffraction. The selected area...

Barium chloride dihydrate (min. 99%) was purchased from Riedel-de Haёn and used as received. The silica source was a commercial sodium silicate solution (so-called water glass) containing about 12.5 wt% SiO2 and 13.8 wt% Na, as supplied by Sigma-Aldrich (reagent grade). All solvents employed for the spectroscopic measurements were of UV spectroscopic grade (Aldrich). Stock solutions (0.1 and 1 ...

Internal cation mobility ratios in molten (Ca, Ba)Cl2 have been measured by the Klemm method for xBa (mole fraction of barium chloride) = 0.25 0.51 at 973 K and xBa = 0 0.61 at 1073 K. From these and available data on the densities and conductivities the internal cation mobilities b have been calculated, assuming additivity of the molar volume. Although bCa in pure CaCl2 is greater than bBa in ...

Supported metal catalysts, particularly noble metals supported on SiO2, have attracted considerable attention due to the importance of the silica–metal interface in heterogeneous catalysis and in electronic device fabrication. Several important issues, e.g., the stability of the metal–oxide interface at working temperatures and pressures, are not well-understood. In this review, the present sta...

In this study, we showed for the first time that barium (Ba) codoping improves luminescent properties of terbium (Tb)-doped SiO2 nanoparticles (NPs). particular, quantum yield (QY) SiO2-Ba,Tb NPs was found to be ∼10.7%, whereas QY bare SiO2-Tb only ∼4.3%. Several mechanisms luminescence enhancement have been proposed. We strongly believe methodology can used create alternative silica-based with...