Osmium cyclopentadienyl carbonyls

CioH20,oOs3Ci,H3, Osmium, p-carbonyl-noncarbonyl(T -cyclopentadienyl)-di- jL-hydrido-cobtilttri-, 25 195 C,oH30,Os3Ci4H5, Osmium, nonacarbonyI(Ti -cyclopentadienyl)-tri- jL-hydrido-cobalt-tri-, 25 197... 

Binding energy, pentacarbonyliron, 6, 3 Binuclear complexes bis-Cp titanium halides, 4, 522 with Ni-M and Ni-C cr-bonds heterometallic clusters, 8, 115 homometallic clusters, 8, 111 Binuclear dicarbonyl(cyclopentadienyl)hydridoiron complexes, with rand C5 ligands, 6, 178 Binuclear iridium hydrides, characteristics, 7, 410 Binuclear monoindenyl complexes, with Ti(IV), 4, 397 Binuclear nickel(I) carbonyl complexes, characteristics, 8, 13 Binuclear osmium compounds, with hydrocarbon bridges without M-M bonds, 6, 619... 

Heterometal alkoxide precursors, for ceramics, 12, 60-61 Heterometal chalcogenides, synthesis, 12, 62 Heterometal cubanes, as metal-organic precursor, 12, 39 Heterometallic alkenes, with platinum, 8, 639 Heterometallic alkynes, with platinum, models, 8, 650 Heterometallic clusters as heterogeneous catalyst precursors, 12, 767 in homogeneous catalysis, 12, 761 with Ni—M and Ni-C cr-bonded complexes, 8, 115 Heterometallic complexes with arene chromium carbonyls, 5, 259 bridged chromium isonitriles, 5, 274 with cyclopentadienyl hydride niobium moieties, 5, 72 with ruthenium—osmium, overview, 6, 1045—1116 with tungsten carbonyls, 5, 702 Heterometallic dimers, palladium complexes, 8, 210 Heterometallic iron-containing compounds cluster compounds, 6, 331 dinuclear compounds, 6, 319 overview, 6, 319-352... 

Osmium forms a wide variety of alkyl and aryl complexes including homoleptic alkyl and aryl complexes and many complexes with ancillary carbonyl (see Carbonyl Complexes of the Transition Metals), cyclopentadienyl (see Cyclopenta-dienyl), arene (see Arene Complexes), and alkene ligands (see Alkene Complexes). It forms stronger bonds to carbon and other ligands than do the lighter elements of the triad. Because of this, most reactions of alkyl and aryl osmium complexes are slower than the reactions of the corresponding ruthenium complexes. However, because osmium is more stable in higher oxidation states, the oxidative addition (see Oxidative Addition) of C-H bonds is favored for osmium complexes. The rate of oxidative addition reactions decreases in the order Os > Ru Fe. 

OSH4P3Z1C34H43, Zirconium, bis(l,l(T )-cyclopentadienyl]tris(dimethylphenyl-phosphine-2KP)-tri- j-hydrido-hydrido-Ipfr-osmium-, 27 27 OSOP2SC42H34, Osmium, carbonyl(5-thioxo-1,3-pen tadiene-1,5-diyl-C, C yS)bis(triphenylphosphine)-, 26 188... 

Some reactions of 77-cyclopentadienyl iron carbonyl complexes are shown in Figure 32. The chemistry of the ruthenium and osmium analogues would be expected to be similar, but few studies have yet been made. 

---