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A procedure to synthesize (μ-hydroxo)bis-pentaaquarhodium(III) nitrate tetrahydrate [Rh2(H2O)8(μ-OH)2](NO3)4·4H2O from potassium hexachlororhodiate(III) is elaborated. The compound is isolated into the solid phase and structurally characterized. The crystallographic data are as follows: a = 5.8763(2) Å, b = 9.4749(4) Å, c = 9.6249(3) Å, α = 79.905(1)°, β = 84.324(1)°, γ = 82.922(1)°, space group P-1, Z = 1, ρcalc = 2.240 g/cm3. The compound is soluble in water, ethanol, and acetone. Hydrolysis takes place in concentrated nitric acid with the formation of mononuclear aqua- and aquanitrate complexes. Thermal decomposition of the salt at a temperature above 580 °C leads to the formation of a single product-rhodium(III) oxide. [ABSTRACT FROM AUTHOR]

The ionic complex, methyltriphenylphosphonium(I) trans-bis(dimethylsulfoxido)tetrabromorhodiate, was prepared by the reaction of sodium hexabromorhodiate with methyltriphenylphosphonium bromide in dimethyl sulfoxide and studied by X-ray diffraction. The phosphorus atom in the [PhMeP] cation has an almost undistorted tetragonal coordination (the CPC angles are 108.3(2)°-110.5(2)°, the P-C bonds are 1.779(6)-1.798(4) Å). In the octahedral complex anion [RhBr(DMSO)- trans], the dimethyl sulfoxide ligands are coordinated by the sulfur atoms (Rh-S, 2.344(1), 2.336(1); Rh-Br, 2.4839(7)-2.4934(7) Å; SRhS, 179.56(7)°; trans-BrRhBr, 179.30(3)°, 179.56(7)°) (CIF file CCDC no. 978748). [ABSTRACT FROM AUTHOR]

A new two-step procedure for modifying graphene oxide by the methylation of its surface with trimethyl- o-formate followed by the treatment with methyl iodide was developed. The methylation product was used as a support for the formation of rhodium nanoparticles. The obtained samples of graphene oxide containing rhodium nanoparticles were characterized by IR spectroscopy, X-ray fluorescence spectroscopy, and transmission electron microscopy. The Rh-containing nanocomposites were used as atalysts for the hydroformylation of olefins in upercritical carbon dioxide and organic solvents. [ABSTRACT FROM AUTHOR]

The syntheses and spectral (IR, UV-VIS, XPS, and H and C NMR) characteristics of the rhodium(III), palladium(II), and platinum(II) complexes with 2-(2-hydroxybenzoyl)- N-methylhydrazinecarbothioamide (HBMHCTA) are described. The coordination of HBMHCTA to the central metal ion and its intraligand rearrangement in the complex formation of rhodium(III) ions are studied. The structure of the mixed-ligand complex [Pd(HL)PPh] is determined by X-ray diffraction analysis. [ABSTRACT FROM AUTHOR]

Preparation of ruthenium( iii) and rhodium( iii) tris-acetylacetonates and palladium( ii) bisketoiminate (Pd(i-acac)) under microwave irradiation using different synthetic conditions, both in the solid-phase and in solution, was studied with precise control of parameters. In the solid-phase systems, the preparation of the target product was hindered. The efficiency of the microwave heating increased when liquid phases of the reagent mixtures were used. For Pd(i-acac), the highest yield was achieved under elevated temperature of the process, with the reaction time decreasing to several minutes. A laboratory procedure for the microwave synthesis of ruthenium( iii) and rhodium( iii) tris-acetylacetonates and palladium( ii) bis-ketoiminate in aqueous solutions was developed, which allowed us to obtain them in 85, 55, and 80% yields, respectively. These yields are higher than those reported in the literature, with the process becoming considerably less time consuming and laborious. [ABSTRACT FROM AUTHOR]