Osmium, hexacarbonyl

C5HgAgF303S2, Silver(l), trifluoromethanesul-fonato(tetrahydrothiophene)-, 34 89 C6CL4O6OS2, Osmium, hexacarbonyl-(di-/r-chloro)(dichloro)di-, 34 219 CsCrKsNs, Chromate(lll), hexa[ C]cyano-, potassium, 34 145... 

O6C6CI4OS2, Osmium, hexacarbonyl(di-/i-chloro)(dichloro)di-, 34 219 O6C0KN3C20H29, Cobalt(III), tricyano(cyclo-pentadienyl)-, (18-crown-6)potassium, 34 169... 

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. 

OsF9NjO,S3CsHi8, Osmium(III), (acetoni-tTile)pentaammine-, tris(trifluorome-thanesulfonate), 24 275 OSIO2C7HS, Osmium, dicarbonyI(Ti -cyclo-pentadienyl)iodo-, 25 191 OSIO2C12H13, Osmium, dicarbonyliodo(Ti -pentamethylcyclopentadienyl)-, 25 191 0s2l20tC6, Osmium(I), hexacarbonyl-di-p.-iododi-, 25 188... 

Chemical identification is a desirable method for detection of a new element Chemical identification of the elements immediately beyond hahnium (element 105) should be possible, but rapid chemical reactions will be required. Chemical properties can be predicted with the help of the periodic table shown in Fig. 24.1, which indicates that elements 106,107, 108, etc., should be chemical homologs, respectively, of tungsten (W), rhenium (Re), osmium (Os), etc. The utilization of volatility properties perhaps offers the best possibility for very rapid chemical identification. The hexafluoride and hexacarbonyl of element 106 (eka-tungsten) should be quite volatile and the hexachloride, pentachloride, and oxychlorides... 

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