Group VII donors

The P—M—Cl group moment of mer-[RhCl3(PEt2R)3] has been estimated as 

Kane-Maguire and C. H. Langford, Inorg. Chim. Acta, 1976,17, L29. 

Ruthenium(m).—Group VII Donors. The consecutive stability constants Ky—Kj of chloro-complexes of Ru have been determined in aqueous and aqueous-alcoholic 1N-HC104. Other Russian workers have compared the 

Ruthenium(IV).—Group VII Donors. An investigation of the hydrolysis of the complexes [RuClg] - and [Ru20Clio] in HCl solution shows that hydrolysis of both begins at HCl concentrations less than 6 mol 1 at 0.1—0.3 

Ruthenium( iv).—Group VII Donors. Electronic spectra have been recorded for a 

Ohyoshi, S. Hiraki, and H. Kawasaki, Bull Chem. Soc. Japan, 1974, 47, 841. 

Poddar, I. P. Khullar, and U. Agarwala, Inorg. Nuclear Chem. Letters, 1974,10, 221. 

Aquation of the oxo-bridged dimer K4[Ru2OCl10] has been re-investigated in aqueous HC1.84 Various RuIV species were observed at different times and acid concentrations (0.002—12 M), although no definite assignments were made. 

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Ruthenium(ii).—Group VII Donors. Halide donor ligands. A study has shown that the blue complexes obtained by electrolytic reduction of H2[RuCl5H20] in acidic solution are further examples of mixed Ru"-Ru " complexes. They were previously assumed to contain only Ru . Dimers of the type Ru2Ch3Vi," (n = 0,1, or 2) were separated and isolated using ion-exchange chromatography. 

Rhodium(i).—Group VII Donors. Halogeno-carbonyl and -phosphine complexes. Convenient atmospheric pressure syntheses have been reported for the complexes [RhCI(PF3)2]2 and [Rh(acac)2(PF3)2], by replacing olefins from suitable substrate complexes, e.g. 

Iridiuin(iv).—Group VII Donors. All reported studies of Ir concerned halogen complexes. Pure IrF4 has been prepared for the first time via reduction of IrFg on a hot filament of Ir or W. X-Ray powder pattern studies of this volatile, red-brown compound showed it to be different from IrFj or IrFs. A simple melt synthesis of K2lrFg has been developed involving the reaction ... 

Platinum(iv).—Group VII Donors. Simple syntheses of hexafluoro-complexes of some noble metals have been reported, including K2[PtF ]. The method involved the melt reaction between KHFj and K2[PtXg] (X = Cl, Br, or I), which has the advantage of not requiring corrosive reagents such as fluorine or BF3- The stepwise stability constants K have been measured for the bromoaquo-complexes [PtBr , (H20)-7 ] "" (n = 4, 5, or 6) formed in... 

Osmium(n).—Group VII Donors. Hydrido- and halogeno-carbonyl complexes. Carbonylation of [OsHX(CO)(PCy3)2] has produced the novel dicarbonyl hydride [OsHX(CO)2(PCy3)2] (X = Cl or Br Cy = tricyclohexyl).17 I.r. and n.m.r. data indicate the geometry (17). Addition of other ligands to the five-co-ordinate... 

Rhodium(i).—Group VII Donors. Hydrido-phosphine complexes. The trifluorophos-phine complex [RhH(PF3)(PPh3)3], an analogue of the well-known homogeneous catalyst [RhH(CO)(PPh3)3], has been synthesized by the displacement process (27).117 Similarly, white crystalline [RhH(PF3)2(PPh3)2] was obtained using a two-molar... 

Iridium)in ) —Group VII Donors. Pulse radiolysis of [IrCl6]3- in aqueous solution has been shown to give [IrCl6]2 " via oxidation with the hydroxyl radicals produced.2 36 On the other hand, when propan-2-ol was added to the solution, pulse radiolysis led to reduction by aquated electrons, hydrogen radicals, and R to yield [IrCl6]4 ... 

Platinum( iv).—Group VII Donors. The equilibrium constants of equation (43) have been studied potentiometrically for am = NH2EtOH, MeNH2, EtNH2, NH3 or... 

Silver(i).—Group VII Donors. A study of the phase equilibria of the AgI-NaI-HzO system has previously led to the isolation of the compound AgI,NaI,3H20 194 u.v-visible spectra and X-ray powder studies indicate the formulation Na[AgI2],3H20.195 The phase transition for the system AgI-I -(KNa)N03 at 280 °C has been studied at high iodide concentrations.196 The results indicate the presence of [Agl4]3 and polynuclear species. Thermodynamic calculations on the distribution of Agl between solid or liquid (K2Ag)I and a nitrate melt have been reported.197 It was concluded... 

Gold(iu).—Group VII Donors. The intermediate in the reduction of [AuC14] by NIV -diphenylthiourea has been isolated as [AuC12(DPT)2]C1.229 The self-reduction of this complex was followed kinetically (equation 51). A new improved preparation of AuC13 has also been reported.230 HAuC14 has been shown to oxidize (S)-methionine... 

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