Group VII Donor Ligands

Silver(i).-Group VII Donor Ligands. AW-Dimethylthioformamide complexes AgCl,-2DMTF, AgBr,2DMTF, and AgI,DMTF have been characterized in solution and in the solid state, and the dissociation constant for reaction (26) was determined from conductivity measurements. Complex solubilities of AgX (X = Cl, Br, or I) have been determined in benzonitrile and trichloroacetonitrile mixtures with propylene-carbonate.The results were compared with previous work in acetonitrile and propionitrile. 

Treatment of AgBr with PPhj in refluxing MeCN yields the new dimer (60) and the tetramer [(PhaP)4 Ag4Br4], both of whose Jf-ray structures were also reported (see Table 7). Their stereochemistries were compared with the structurally analogous 

Danksagmuller, G. Gritzner, and V. Gutmann, Inorg. Chun. Acta, 1976,18,269. 

Ag3P309,H20 0.048 P3O9 cyclic anion has chair configuration h  

A new ternary halide CaAg2H has been obtained as a black, diamagnetic compound either by hydriding CaAg2 alloy or by the solid state reaction between Ag and CaH2 in a H2 atmosphere.  

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Gold(lll).—Group VII Donor Ligands. The single-crystal polarized electronic spectra of NaAuCl4,2H20 have been measured at a number of temperatures. The bands... 

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. 

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... 

Clusters of the group V-VII metals in high formal oxidation states, stabilised by 7t-donor ligands such as oxide, sulphide, or halides. Examples here include [Nb6Cli2] +, [WeBrgJ +and [Re3Cl9] +. 

Little reliable data concerning the influence of the nature of ligands can be found in the literature. A recent study by Pretzer et at. covers the Group V triphenyl derivatives [25]. Use of triphenyl phosphine yields ethanol in high selectivity, whereas iriphcnyl arsine yields preponderantly acetaldehyde (c.f. Table VII). This finding is interpreted by correlating the o-donor ability of... 

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