Group VII ligands

L-2-Amino-2-me thy 1-3-pho spho-propanoic acid (phospho-a-methylserine) (C/H,aO,NP), 

L-2-Amino-3-(methylthio)- HL/H.L propanoic acid (S-methyl-cysteine) (C H O NS), HL 

Nitrilobis (ethyleneimino) -tributanedioic acid (diethylenetriamino-trisuccinic acid) 

Other references 73GK, 73GKS,73GSK,79MMb, 

DL-l-Carboxy 2-(2-mercapto-4- HL/H.L imidazolyl)ethyl(trimethyl)-ammonium (chloride)  

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In the case of replacement of CO from the group VI carbonyl compounds there is additional evidence to the effect that the type A ligands labilize CO whereas the type B do not, but rather promote a second-order reaction. For the group VII octahedral compounds there is no strong evidence in favour of an associative activation step, except when interpretation is obscured by subsequent or concurrent reaction (but see ref. 146). There is, however, good reason to believe that such an associative reaction does occur in certain of the group VI compounds. 

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... 

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. 

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... 

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