Osmyl complexes halides

As might be expected for chelating 0,0 donor ligands it is the intermediate trivalent state of osmium which is stabilized by /J-diketonates (as is the case for catechols, p. 597, and tropolonato complexes, p. 597). In the presence of rc-acceptor chelates such as bipy, phen and terpy the II state is favoured, while with halides the IV state is preferred. The apparent absence of an osmyl complex, e.g. 0s02acac2, is surprising. 

A wide range of d Os complexes has been prepared and characterized. These complexes are usnally diamagnetic see Diamagnetism) and often incorporate the osmyl trans-0=0s=0 dioxo unit or the monooxo 0s=0 nnit, often with halide, N-, or O-donor ligands. They are more stable and less oxidizing than their Ru analogs, and are often prepared by rednction of OSO4 or, in certain cases, by controlled oxidation of Os and Os precursors. 

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See also in sourсe #XX -- [ ]

See also in sourсe #XX -- [ , ]

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