Oxo-complexes

The hydroxo complexes [Au(6-Rbipy)(OH)2], postulated as intermediates in the formation of 44c-i, are not isolated nevertheless, in all the mass spectra (FAB conditions) a weak peak is found corresponding to these species. Unchanged 44c-i are quantitatively recovered from the reaction with aqueous solutions of HX (X = BF4 or PFfi) neither dihydroxo complexes similar to those observed in the vapor phase, nor hydroxo bridged dimers are obtained [25]. 

The molybdenum(vi)-dioxo-complexes studied are all octahedral. In [MoOaCCsHeNO) ] (20) the two Mo-O(terminal) bonds, of 1.71(2) A, are cis to one another and subtend an angle at the molybdenum atom of 

O anometallic Molecules.—The complexes reported are mostly molybdenum carbonyls involving a variety of other ligands. 

Carbonyl Complexes. In all of these the metal atom is six- or seven-coordinate. In the six-co-ordinate complexes the co-ordination polyhedron around the metal atom is the octahedron. 

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Mono(cyclopentadienyl), or half-sandwich poly-oxo complexes are of interest as hydrocarbon-soluble models for oxide catalysts. The action of water on [Ta( j -C5Me5)(PMe3)2] yields the colourless [Ta4( j -C5Me5)407(0H)2] which has a tetranuclear butterfly core (Fig. 22.12c).( >... 

Again, fluoro and oxo complexes of rhenium predominate. The reaction of KF and ReFe in an inert PTFE vessel yields pink K2[ReFs], the anion of which has a square-prismatic structure hydrolysis converts it to K[ReOFs]. 

It gives the parent ion in the mass spectrum and has a simple IR spectrum (i (Ru=0) 1040 cm-1 and (i/(Ru—F) 720 cm-1) similar to that of the vapour (1060, 710, 675 cm-1), implying a monomeric structure. Chlorides RuOC12 and Ru2OC1x (x = 5,6) have been claimed various oxo complexes Ru2OX o are well defined. 

Another, and less surprising, example of ruthenium(IV) lies in the oxo complexes with macrocycles like 14-TMC (Figure 1.53). 

Seven and eight coordinate molybdenum complexes and related molybaenum(IV) oxo complexes with cyanide and isocyanide ligands. S. J. Lippard, Prog. Inorg. Chem., 1976, 21, 91-103 (44). 

Gable, Kevin P, Rhenium and Technetium Oxo Complexes in the Study of Organic... 

In the latter case, a dinuclear oxo bridged complex [Au2(N,N)2(p,-0)2][BF4]2 is also formed in small amounts. The same oxo complexes are obtained in high yields, as the... 

D.G., Morokuma, K, Takahashi, M. and Hill, C.L. (2007) Terminal Gold-Oxo Complexes. Journal of the American Chemical Society, 129, 11118—11133. 

The second example of a high-spin iron-oxo complex, [Fe (0)(TMG3tren)] (see Table 8.4) has been published only recently. In this compound, the HS state is afforded by the trigonal bipyramidal symmetry of the TMG3tren ligand, causing... 

Each of the functionals included in Table 11-3 shows a comparably good performance for all oxo complexes. The differences between the functionals, be they of pure GGA or hybrid type are in general small. This is even more remarkable if one takes into account that... 

Table 11-3. Absolute 170 NMR chemical shifts [ppm] in transition metal oxo complexes.

Deng, L., Ziegler, T., 1997, Theoretical Study of the Oxidation of Alcohols to Aldehyde by d° Transition-Metal-Oxo Complexes Combined Approach Based on Density Functional Theory and die Intrinsic Reaction Coordinate Method , Organometallics, 16, 716. 

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