Multicomponent synthesis of propargylamines in the presence of magnetic nanocatalyst

In current study Fe3O4 nanoparticles were used as a catalyst in the synthesis of propargylamines via three component reaction between aldehyde, alkyne, and an amine. The effect of different reaction parameters on conversion of aldehyde was investigated and the samples were characterized by SEM, EDS, GC, and NMR spectroscopy. It was observed that in the presence of Fe3O4 nanoparticles and by applying microwave irradiation reaction time decreased significantly

2-Amino­pyridinium diphenyl­phosphinate monohydrate

In the crystal of the title hydrated salt, C5H7N2 +·C12H10O2P−·H2O, the cations, anions and water mol­ecules connected by N—H⋯O and O—H⋯O hydrogen bonds into a layer along the bc plane; the phenyl rings protrude into the space between the layers. The dihedral angle between rings of anion is 86.1 (1)°

Monoclinic modification of 1,2-bis­(diphenyl­seleno­phosphino­yl)ethane

The complete mol­ecule of the title compound, C26H24P2Se2, is generated by crystallographic 2-fold symmetry, with the rotation axis bisecting the central C—C bond. The dihedral angle between the terminal aromatic rings is 74.1 (1)°

Preparation and Quality Control of the [153Sm]-Samarium Maltolate Complex as a Lanthanide Mobilization Product in Rats

Development of lanthanide detoxification agents and protocols is of great importance in management of overdoses. Due to safety of maltol as a detoxifying agent in metal overloads, it can be used as a lanthanide detoxifying agent. In order to demonstrate the biodistribution of final complex, [153Sm]-samarium maltolate was prepared using Sm-153 chloride (radiochemical purity >99.9%; ITLC and specific activity). The stability of the labeled compound was determined in the final solution up to 24h as well as the partition coefficient. Biodistribution studies of Sm-153 chloride, [153Sm]-samarium maltolate were carried out in wild-type rats comparing the critical organ uptakes. Comparative study for Sm3+ cation and the labeled compound was conducted up to 48 h, demonstrating a more rapid wash out for the labeled compound. The effective and biological half lives of 2.3 h and 2.46h were calculated for the complex. The data suggest the detoxification property of maltol formulation for lanthanide overdoses

rac-(3-Hydr­oxy-2-phenyl­propionato-κO)triphenyl­tin(IV)

The SnIV atom in the monomeric title compound, [Sn(C6H5)3(C9H9O3)] exists in a distorted SnC3O tetra­hedral geometry. In the crystal structure, inversion dimers arise from pairs of O—H⋯O hydrogen bonds

Layered double hydroxides intercalated by long chain anions as oil phase gelling agent

Layered double hydroxides intercalated by long-chain anionic species were prepared and characterized by X-ray powder diffraction.The linear carboxylates are greatly disordered along the stacking direction but dimer fatty acids with planar aromatic moieties show regular X-ray patterns. Alkylarylsulfonates and petroleum sulfonates aggregated in the interlayer spaces forming bimolecular films of constant thickness, which produce integral series of basal reflections in the X-ray diagrams. Solubility and gel strength of prepared exchanged layered double hydroxides were tested in an oil base drilling fluid formulation and applications of these compounds were compared with conventional organophilic clays

Layered double hydroxides intercalated by long chain anions as oil phase gelling agent

485-490Layered double hydroxides intercalated by long-chain anionic species were prepared and characterized by X-ray powder diffraction.The linear carboxylates are greatly disordered along the stacking direction but dimer fatty acids with planar aromatic moieties show regular X-ray patterns. Alkylarylsulfonates and petroleum sulfonates aggregated in the interlayer spaces forming bimolecular films of constant thickness, which produce integral series of basal reflections in the X-ray diagrams. Solubility and gel strength of prepared exchanged layered double hydroxides were tested in an oil base drilling fluid formulation and applications of these compounds were compared with conventional organophilic clays

Synthesis, Characterization and Cytotoxic Activity of 8-Hydroxyquinoline Derivatives

ABSTRACT The cytotoxic effects of synthesized quinoline derivatives were tested against the leukemia derived Nalm6 cell lines. The preliminary cytotoxicity screening program revealed that the investigated compounds induced 50% inhibition of the cell at micromolar concentrations and thus could be considered as biologically active. The compound of 5-chloro-8-hydroxyquinolinium chloride proved superior to the remaining agents. The synthesized compounds were characterized by 1 HNMR, 13 CNMR and Mass spectroscopy. Moreover, the crystal structure of 5-chloro-8-hydroxyquinolinium chloride was solved which confirms the several hydrogen bonding in the solid state of this compound that stabilized crystal packing

Photonic design of embedded dielectric scatterers for dye sensitized solar cells

Embedded dielectric scatterers comprise an important approach for light trapping in dye-sensitized solar cells (DSCs) due to their simple fabrication process. The challenge in applying these scatterers lies in finding the optimal dimensions and concentration of the scatterers. This requires many experiments and it is often quite difficult to have a starting point for optimizing the concentration. Based on theories of light propagation in random media, we propose a simple model for DSCs with embedded silica spherical particles. Then, by full-wave optical calculations, we determine a narrow range for the concentration of silica particles that leads to the largest optical absorption in the cell. The simulation results were verified by realizing DSCs with different concentrations of silica particles. A power conversion efficiency of 8.08% in an 11 mu m-thick N719-sensitized DSC was achieved with 6 vol% embedded silica, which further increased to 9.30% by applying a white scattering layer on the rear-side of the counter electrode. The design approach, presented here, is a general approach that can be applied for other types of solar light harvesting structures with low optical absorption coefficient

Markovnikov hydroformylation catalyzed by ROPAC in the presence of phosphine and phosphine oxide ligands

<div><p>Rhodium catalyzed hydroformylation of 1-octene in the presence of different phosphine and phosphine oxide ligands has been investigated. The molecular structure of new phosphine ligand, fluorenylidine methyl phenyl diphenylphosphine was determined by single-crystal X-ray crystallography. Parameters such as different ligands, molar ratio of ligand to rhodium complex, ratio of olefin to rhodium complex, pressure of CO:H₂ mixture and time of the reaction were studied. The linear aldehyde was the main product when the phosphine ligands were used as auxiliary ligands while the selectivity was changed to the branched products when the related phosphine oxide ligands were used. Under optimized reaction conditions, in the presence of [Rh(acac)(CO)(Ph₃P)]-di(1-naphthyl)phenyl phosphine oxide, conversion of 1-octene reached 97% with 87% selectivity of branched aldehyde.</p></div