Group VI Donor Ligands

Dithioacid complexes [MX(PR3)(S-S)] (M = Pd X = Cl, Br, or I Pr = PMe2 Ph S-S = S2PRi, S2CNRi, or S2COR M = Pt X = Cl, PrJ = PMeiPh or PMePh2) have been characterized by i.r., and in some cases n.m.r. and mass spectroscopy. The mixed dithio-complex (40), which is stereochemically rigid 

Oxidative addition of dithiophosphonic and dithiophosphinic acids to [Pt(PPh3)4] produces the air-stable hydrido [v(PtH) = 2150cm ] complex c/s-[PtH(PPh3)2- 

Santoro, G. Cum, and N. Giordano, Inorg. Chim. Acta, 1976,17, 97. A. Albinati, A. Musco, G. Cartuian, and G. Strukul, Inorg. Chim. Acta, 1976,18, 219. 

A series of sulphide, selenide, and telluride complexes [MLjXj] (M = Pd or Pt L = SEtj, SeEtj, or TeEtj X = Cl, Br, or I) have been prepared (see p. 353).  

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Group VI Donor Ligands. It has been reported that amorphous Au203(aqueous) may be transformed in HCIO4 solution to give single crystals of ruby orthorhombic AU203. ... 

The review of the literature of 1991 follows the sane format as last year, with some general review articles given in section 2. This chapter is further divided into sections for the metals of each periodic group with subdivisions, where necessary, to help the reader locate complexes of basic structural types. Substitution reactions of mononuclear metal carbonyls with group V and/or group VI donor ligands are fully discussed, but metal-metal bonded polynuclear metal carbonyls are only covered when reactions lead to products in which these bonds are cleaved. Carbonyl complexes which contain metal-metal bonds are fully reviewed in Chapter 9. 

Rather less attention has been paid to complexes with Group VI donor ligands. The reaction of Cr(C0)g with Et NOH in aqueous THE solution affords [Et N] [Cr (CO) 2 ], the cubane-like anion... 

Group VI Donors. Oxygen donor ligands. A series of unsymmetrical tris-(P-diketonato)M " complexes (17) has been investigated in order to establish CIS—trans isomer distributions, and relative rates of isomerization. Included in this study was the preparation and separation of the geometric isomers of [Ru(tfac)3] and [Ru(bzac)3] (tfac = trifluoroacetylacetone, bzac = benzoyl-acetylacetone). In weakly polar media, the trans-isomer of [Ru(tfac)3] was found to be more stable, whereas the isomer distribution of similar complexes with R, R = alkyl or Ph, is statistical. ... 

Group VI Donors. Oxygen donor ligands. A new and more successful preparation of CIS- and tra s-K[Rh(ox)2(H20)2] has been reported, via the chromatographic separation of the acid hydrolysis products from Kj[Rh(ox)3],4j-H20. The u.v.-visible spectra of these complexes cast doubts on the purity of the samples previously described. An interesting feature of Rh -oxalate chemistry is the assertion that K3[Rh(ox)3],4 H20 actually exists as the partly unidentate K6[Rh(ox)3][Rh(ox)2(C204H)(OH)],8H20. This has now... 

Group VI Donors. Oxygen and sulphur donor ligands. Oxidative addition of tetrachloro-l,2-benzoquinone to rrans-[Ir(CO)Cl(PR3)2] (R3 — Ph3 or Ph2Me) has been shown to give the Ir ° products [Ir(02CgCl4)(C0)Cl(PR3)2], whose structures (45) were confirmed from far-i.r. and H n.m.r. data. Comparison... 

Group VI Donors. Oxygen and mixed oxygen-nitrogen donor ligands. A more convenient synthesis has been reported for the chiral complex [Pd(tfacCam)2] (52), involving the reaction of Ba(tfacCam)2 with PdCl2- ... 

Group VI Donors. O-Donor ligands. A general route to noble metal carboxylate derivatives has been described involving reaction of low oxidation state complexes... 

Carbonyl complexes containing group IV. V or VI donor ligands 285... 

R. J. Mawby Substitution reactions of metal and organometal carbonyls with Group V and VI donor ligands, pp. 228-253 (165). 

Lewis Base complexes—ligands with Group VI donor atoms... 

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