Multifunctional phosphine stabilized gold nanoparticles: an active catalytic system for three-component coupling reaction.

Multifunctional phosphine based ligands, 1,1,1-tris(diphenylphosphinomethyl)ethane [CH3C(CH2 PPh2)3][P3] and 1,1,1-tris(diphenylphosphinomethyl)ethane trisulphide [CH3C(CH2P(S)Ph2)3][P3S3] have been introduced to stabilize Au(o)-nanoparticles having small core diameter and narrow size distribution. The Au(o)-nanoparticles were synthesized by the reduction of HAuCl4 precursor with NaBH4 in the presence of ligand P3 or P3S3 using two phases, one pot reaction at room temperature. The Au(o)-nanoparticles exhibit face centered cubic (fcc) lattice having different crystalline shape i.

Au(degrees)-nanoparticles: control size and morphology stabilized by tripodal phosphine based ligands and their antimicrobial activity.

Metal nanoparticles have attracted great attention due to their potential applications in the fields like electronics, opto-electronics, bioscience, catalysis, etc. New ligands 1,1,1-tris (diphenylphosphinomethyl) ethane [CH3C(CH2PPh2)3] 1 and 1,1,1-tris-(diphenylphosphino methyl) ethane trisulphide [CH3C(CH2P(S)Ph2)3] 2 for stabilization of Au(degrees)-nanoparticles having small core diameter were prepared. The Au(degrees)-nanoparticles are more active against Gram(+) bacteria, e.

Metal nanoparticles: in-situ stabilization, characterization and reactivities.

We report here, the technique for preparation, characterization and reactivities of different metals (Cu, Ni, Au, Ru, Pt etc.) nanoparticles. The stabilized metal nanoparticles are, in general, very active as catalysts, e.

Synthesis, characterisation and thermal studies of ruthenium(II) carbonyl complexes of functionalised tripodal phosphine chalcogen donor ligands, [CH(3)C(CH(2)P(X)Ph(2))(3)], where X=Se, S, O.

The polymeric ruthenium(II) carbonyl complex, [Ru(CO)(2)Cl(2)](n) reacts with 1,1,1-tris-(diphenylphosphinomethyl)ethane trichalcogenide ligands, [CH(3)C(CH(2)P(X)Ph(2))(3)], where X=Se(a), S(b) and O(c) in 1:1 (metal:ligand) molar ratio to afford hexa-coordinated complexes of the type eta(2)-(X,X)-[Ru(CO)(2)Cl(2)P(3)X(3)] (1a-c). The complexes 1a-c exhibit two equally intense nu(CO) bands in the range 1979-2060cm(-1) indicating cis-disposition of the two terminal carbonyl groups. The values of nu(CO) frequencies containing different ligands, in general, follow the order: P(3)O(3)>P(3)S(3)>P(3)Se(3) which may be explained in terms of 'Soft-Hard' (Ru(II)-O) and 'Soft-Soft' (Ru(II)-S/Se) interactions.