- Separation and characterization of new transition metal complexes of some chromone derivatives
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Transition metal complexes of two new ligands derived from the condensation of 6-formyl-7-hydroxy-5-methoxy-2-methylchromone with barbituric acid (H2L1) and 6-formyl-5,7-dihydroxy-2-methylchromone with thiobarbituric acid (H3/s
- Youssef, Nabil S.
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- Studies on metal carboxylates. 12. Reactions of molybdenum(II), rhodium(II), and rhenium(III) acetates with gaseous hydrogen chloride and hydrogen bromide
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Molybdenum(II) acetate (Mo2(O2CCH3)4) reacts with gaseous hydrogen chloride and hydrogen bromide at 300°C to afford the phases β-MoX2, where X = Cl or Br. Reaction of these halides with pyridine and monodentate tertiary phosphines to produce metal-metal bonded dimers of the type Mo2X4L4 suggests that they are best formulated as [Mo2X4]n and are accordingly the parent halides of haloanions Mo2X84-. In contrast to this behavior, the rhenium(III) acetates, Re2-(O2CCH3)4X2, where X = Cl or Br, react with HCl and HBr to yield the trinuclear halides Re3X9. This is the first instance where a dinuclear rhenium halide containing a quadruple metal-metal bond has been converted to a trinuclear cluster. The related reaction of dinuclear rhodium(II) acetate with HCl and HBr differs from those involving Mo2(O2CCH3)4 and Re2(O2CCH3)4X2 in that disproportionation to RhX3 and rhodium metal occurs.
- Glicksman,Hamer,Smith,Walton
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- Kinetic studies on the oxidation of dichlorotetracarbonyldirhodium(I) by hydrogen peroxide
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Kinetic measurements on the oxidation of dichlorotetracarbonyldirhodium(I) by hydrogen peroxide in ethanol/hydrochloric acid indicate that reaction proceeds through the intermediate "".The reaction rate is first order with respect to the rhodiu
- Chipperfield, John R.,Shana'a, May,Webster, David E.
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- Chlorination kinetics of rhenium, rhodium and iridium
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The rates of reaction between flowing chlorine and rhodium, rhenium and iridium were measured by the rates of mass change of samples of the reacting metal and correlated as functions of temperature and chlorine pressure. Attempts were made to correlate th
- Landsberg Arne
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- Thermodynamic Properties of Ruthenium and Rhodium Chlorides
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Thermodynamic properties of ruthenium and rhodium trichlorides were studied by high-temperature mass spectrometry from 591 to 724 and 500 to 683 K, respectively. RuCl3 and RhCl3 dissociate to metal at these temperatures. The dissociation pressures of RuCl3 and RhCl3 were measured. No ruthenium or rhodium chlorides were found in the gas phase.
- Tagirov,Makarov,Bryukvin
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p. 919 - 921
(2008/10/08)
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- Ortho-chelated arylrhodium(I) complexes. X-ray structure of RhI[C6H3(CH2NMe2) 2-o,o′-C,N ](COD)
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The reaction of Lin[C6H3(CH2NMe 2)-o-R-o′]n with [RhCl(diene)]2 yields the ortho-chelated arylrhodium(I) complexes Rh[C6H3(CH2NMe 2)-o-R-o′](diene) (R = CH2NMe2, diene = COD (1a) or NBD (1b); diene = COD, R = Me (2) or H (3)). The solid-state structure of 1a was determined by a single-crystal X-ray diffraction study. C20H31N2Rh: triclinic, space group P1, with lattice parameters a = 10.169 (1) ?, b = 13.036 (1) ?, c = 14.688 (2) ?, α = 79.54 (1)°, β = 77.04 (1)°, γ = 79.53°; V = 1845.6 (4) ?3, Z = 4; D(calcd) = 1.448 g cm-3. Refinement with 4696 observed reflections converged at R = 0.0395. The structure of 1a consists of a rhodium(I) center that has a square-planar coordination comprising the two double bonds of COD and a C atom and one of the N atoms of the monoanionic aryl ligand. In solution compounds 1 and 2 exhibit dynamic behavior which involves a reversible dissociation of the Rh-N bond and rotation of the aryl moiety around Rh-C. This process, which generates a highly unsaturated T-shaped 14 electron species, is accompanied by the relief of steric repulsions within the complex. Complex 1 reacts with a range of electrophilic reagents leading to Rh-C bond breakage (HX, X = acac, Cl, Br, OAc, OH, OMe, L-alanyl; MXnLm, SnMe2Br2, NiBr2(PBu3)2, ZrCl4, PdCl2(NCPh)2, HgCl2, PtBr2(COD), and [IrCl(COD)]2). A redox reaction of 1 with AgX (X = OAc, NO3) leads to the formation of RhIIIX2[C6H3(CH2NMe 2)2-o,o′](H2O).
- Van Der Zeijden, Adolphus A. H.,Van Koten, Gerard,Nordemann, Richard A.,Koji?-Prodi?, Biserka,Spek, Anthony L.
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p. 1957 - 1966
(2008/10/08)
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