Sulfato ligand

A simplified series of reactions between a hafnium salt and sulfuric acid is given in Fig. 4.3. The reactions showcase important facets of thin-film synthesis (but do not address the precise identities of intermediates or complexities of aqueous hafnium chemistry.) In the first step, a hafnium oxide chloride crystal hydrate is dissolved in water to disperse small hafnium-hydroxo molecular clusters. Sulfato ligands are subsequently added in the form of sulfuric acid. Since sulfato binds more strongly than chloro, hafnium-hydroxo-sulfato aqueous species are created. Under mild heating, these species readily poly-... 

The reaction of a dicobalt complex bridged by a peroxo ligand with the sulfite ion has been reported. In this reaction, a dicobalt complex containing a bridging sulfato ligand is formed, along with free sulfate (196). 

A crystal structure determination of [pyH]4[Mo203(S04)(NCS)6] has shown the two molybdenum atoms to be bridged by one oxo and the sulfato ligand. The terminal oxygens are syn and each molybdenum has a distorted octahedral geometry.415 Persulfide bridges have been identified in several dimeric Mov complexes. In each molybdenum is... 

Isolation of the Mo2Br8 ion has proven more elusive than that of the chloride derivative. Brencic et at. have recently reported the characterization and crystal structure of (NH4)4Mo2Br8 formed by substitution of the sulfato ligands of Mo2(S04)4 in hydrobromic acid solution (40). Vibrational data for Cs4Mo2Br8 prepared from Mo2(02CCH3)4 and aqueous HBr was published in 1973 by Ketteringham and Oldham (165). 

The IR spectrum of Kg(V0)20(S04)6 includes bands from both unidentate and bridging sulfato ligands.422... 

We write the sulfato ligand as OSO3 to emphasize that it is coordinated through a lone pair on one of the O atoms. 

The and PtNMR spectra of the binuclear /i-sulfato and ju-hydrogen phosphato complexes of platinum(III) show values of V(PtP) in the range 40-100 Hz, and V(PtPt) between 3500 and 5400 Hz. The V(PtPt) values for the hydrogen phosphato complexes are significantly larger than those of complexes with bridging sulfato ligands. 

The variety of kinetic behaviors observed in the reductions of [(NH3)5RuX] -" (X"- = SO, S20r, and NH2SO3) by TP has been interpreted in terms of the ability of sulfato ligands to mediate electron transfer. Outer-sphere reductions occur when X" = NH2SOJ or SO4", with TP and... 

The general mechanism of sulfite oxidation at the Mo active site is as described in Scheme 5.8. Sulfite attacks the equatorial oxido ligand of Mo and is incorporated into the coordination sphere as a sulfato ligand bound to Mo The two electrons on Mo are passed, one at a time, to the adjacent heme (if present), which then relays them to the terminal electron acceptor cytochrome c7 ... 

Fig. 60. Different coordination modes of the sulfato ligand in rare earth sulfate structures (after Ponomarenko et al., 1978).

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