Silica-supported molybdenum surface complexes were prepared by the reaction between (N=)Mo(OtBu)3 and silica via displacement of the tert-butoxy ligands for siloxyls from the silica surface. The structure of the surface molybdenum complexes was well defined by in-situ FT-IR, elemental analysis, H NMR and C CP/MAS NMR techniques. The surface complexes could undergo alcoholysis reaction with CD3O...

Precious metals are currently associated with selenium (naumannite, Ag2Se) and tellurium (calaverite, AuTe2; sylvanite, (Au,Ag)2Te4) to form species refractory to cyanidation. The aim of this preliminary work was to study the use of the solvent extraction technique to recover tellurium and selenium ions from a synthetic solution similar to the cyanidation effluents to recycle the free cyanide b...

The ion exchange reaction between ammonium cyanoureate NH4[H2NC(=O)NCN] and zinc chloride yielded single crystals of the urea derivative cyanoguanylurea H2NC(=O)NHC(NH2)NCN, which was obtained as a by-product alongside zinc cyanoureate and traces of ammonium chloride. It is assumed that owing to its Lewis and Brønsted acidity, the hydrated Zn2+ ion acts as a catalyst, promoting the degradation ...

We describe the first use of Bis-tris propane {2,2'-(propane-1,3-diyldiimino)bis[2-(hydroxymethyl)propane-1,3-diol], H(6)L}, in nickel and cobalt chemistry and report the synthesis, structure and magnetic properties of [Ni(4)(H(4)L)(H(3)L)(acac)(2)](+) (1) and [Co(II)(3)Co(III)(2)(H(2)L)(2)(acac)(3)(MeOH)](+) (2).

Potential of rhodium(III) chloride in catalyzing, in aqueous sulfuric acid medium, the oxidation of vicinal diols, and the kinetics of reaction of cerium(IV) with propane-1,2-diol and butane-2,3-diol catalyzed by rhodium(III) chloride was investigated. Data show that the reactions follow first order kinetics with respect to low cerium(IV) for lower concentrations, but a further increase in the ...

We developed a facile method to fabricate deep ultraviolet (UV) photonic crystal crystalline colloidal array (CCA) Bragg diffraction devices. The CCAs were prepared through the self-assembly of small, monodisperse, highly surface charged silica particles (~50 nm diameter) that were synthesized by using a modified Stöber process. The particle surfaces were charged by functionalizing them with th...

In the title complex, [RuCl(2)(C(8)H(12))(C(3)H(5)N)(2)], the metal ion is coordinated to both double bonds of the cyclo-octa-1,5-diene ligand, two chloride ions (in cis positions) and two N-atom donors from two propane-nitrile mol-ecules that complete the coordination sphere for the neutral complex. The coordination around the Ru(II) atom can thus be considered as octa-hedral with slight trigo...

The aim of the present study was to assess the effects of ammonium sulphate exposure on the antioxidant defence system and lipid peroxide concentration in the testes of wistar rats, as well as the examine possible protective role of zinc from the adverse effects of ammonia .The LD50 of Ammonium Sulphate and Zinc Chloride were determined, after toxicity testing evaluation. It is 91.5 mg/kg body ...

We evaluated the efficacy of the antimicrobial activity of cotton-polyester fabric treated with 3-(trimethoxysilyl)propyldimethyloctadecyl ammonium chloride (DC 5700), a quaternary ammonium compound bound irreversibly to the material. Significant antimicrobial activity was observed with 58 of 61 gram-positive cocci but with only 1 of 35 gram-negative bacilli and 0 of 5 yeasts. No inhibition of ...