65295-04-7Relevant academic research and scientific papers
Efficient general procedure to access a diversity of gold(0) particles and gold(I) phosphine complexes from a simple HAuCl4 source. Localization of homogeneous/heterogeneous system's interface and field-emission scanning electron microscopy study
Zalesskiy, Sergey S.,Sedykh, Alexander E.,Kashin, Alexey S.,Ananikov, Valentine P.
supporting information, p. 3550 - 3559 (2013/05/09)
Soluble gold precatalysts, aimed for homogeneous catalysis, under certain conditions may form nanoparticles, which dramatically change the mechanism and initiate different chemistry. The present study addresses the question of designing gold catalysts, taking into account possible interconversions and contamination at the homogeneous/heterogeneous system's interface. It was revealed that accurate localization of boundary experimental conditions for formation of molecular gold complexes in solution versus nucleation and growth of gold particles opens new opportunities for well-known gold chemistry. Within the developed concept, a series of practical procedures was created for efficient synthesis of soluble gold complexes with various phosphine ligands (R3P)AuCl (90-99% yield) and for preparation of different types of gold materials. The effect of the ligand on the particles growth in solution has been observed and characterized with high-resolution field-emission scanning electron microscopy (FE-SEM) study. Two unique types of nanostructured gold materials were prepared: hierarchical agglomerates and gold mirror composed of ultrafine smoothly shaped particles.
Late transition metal oxo and imido complexes. II. Gold(I) oxo complexes
Yang, Yi,Ramamoorthy, Visalakshi,Sharp, Paul R.
, p. 1946 - 1950 (2008/10/08)
The gold(I) oxo complexes [(LAu)3(μ3-O)] BF4 (1) have been prepared for L = PMePh2, PMe2Ph, PEtPh2, PPriPh2, P(p-ClPh)3, P(o-tol)3, P(OEt)Ph2, and P(OMe)3. Two of these new oxo complexes, as well as a new crystal form of [(PPh3Au)3(μ3-O)]BF4, were structurally characterized. Crystals of [(PMePh2Au)3(μ3-O)]BF 4·CH2Cl2 from CH2Cl2/ether are monoclinic (P21/c) with a= 11.395(2) A?, b = 25.901(2) A?, c = 16.024(3) A?, β = 110.615(8)°, and Z = 4. Crystals of [(PPh3Au)3(μ3-O)]BF 4·1.5CH2Cl2 from CH2Cl2/ether are monoclinic (P21/c) with a = 14.723(3) A?, b = 14.808(3) A?, c = 25.999(3) A?, β = 104.06(3)°, and Z = 4. Crystals of [(P(O-tol)3Au)3(μ3-O)]BF 4·xC6H14·0.5H2O from CH2Cl2/hexane are monoclinic (P21/a) with a = 14.2611(45) A?, b = 27.4668(71) A?, c = 23.0907(81) A?, β = 91.37(2)°, and Z = 4. The PPh3 and the PMePh2 structures consist of inversion-related edge-bridged [(LAu)3O]+ dimers held together by Au-Au interactions. The P(o-tol)3 structure consists of isolated [(LAu)3O]+ units. New oxo complexes are also formed in equilibrium mixtures of [((PPh3)Au)3(μ3-O)]BF4 and LAuCl. Oxygen-17 NMR data for 1 show chemical shifts of +19.7 to -36.0 ppm (H2O reference) with upfield shifts corresponding to increasing basicity of the phosphine, L.
