Osmium tetracarbonyl

Your first question is one which we have discussed previously. You know that the report by Rest is simply cited in a footnote somewhere. It has never been presented in detail. I think that what really counts is the stability of the organo-metallic product which is left behind. Certainly iron tetracarbonyl is an organo-metallic fragment which is produced in many reactions of iron carbonyls. But, as you know, osmium tetracarbonyl is apparently of such high energy that its forma-... 

The mononuclear metal carbonyls contain only one metal atom, and they have comparatively simple structures. For example, nickel tetracarbonyl is tetrahedral. The pentacarbonyls of iron, ruthenium, and osmium are trigonal bipyramidal, whereas the hexacarbonyls of vanadium, chromium, molybdenum, and tungsten are octahedral. These structures are shown in Figure 21.1. 

SbFeOC22H 3, Iron, tetracarbonyl-(triphenylstibine)-, 26 61 Se, Silenium, Osmium, carbonyl clusters, 26 308... 

CIH)090s3C,o, Osmium, nonacarbonyKp,-chloromethylidyne)tri-p-hydrido-triangulo-Ui-, 27 205 ClHgMnjOgPCjoHio, Manganese, p-(chloromercurio)-p-(diphenylphos-phino)-bis(tetracarbonyl-, (Mn—Mn 26 230... 

The structurally characterized octahedral tetracarbonyl complex m-[Os(GO)4(FSbF5)2] 3 is formed upon fluorination of [OS3GO12] with HF/SbFs. The oxidative fluorination of [M3(GO)i2] with XeF2 in anhydrous HF provides a route to m-[M(GO)4F2] (M = Ru 4a, Os 4b). Both the ruthenium and osmium complexes were characterized by multi-nuclear NMR spectroscopy, along with [M(GO)sF] (M = Ru 5a, Os 5b), mer- and < -[Ru(GO)3F3] 6 and 7, and a range of dinuclear complexes, which were formed as minor products. Removal of the HF solvent in vacuo results in conversion of [M(GO)4F2] to the tetrameric species [ Os(GO)3F2 4]- ... 

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