Triosmium clusters

Reactions of triosmium clusters with organic compounds. K. Burgess, Polyhedron, 1984. 3, 1175... 

Scheme 61. Synthesis of the silsesquioxane triosmium cluster compound 180.

Acetylides (continued) liquid crystals, 12, 246 powder diffraction studies, 1, 586 in Ru—Os mixed-metals, 6, 1081 j2-Acetylides, in triruthenium and triosmium clusters, 6, 761... 

Over the past few years there has been a growing body of literature on the photophysics and photochemistry of organometallic Os complexes. A significant portion of the literature has focused on the photochemistry and transient photophysical characterization of triosmium clusters involving Os - Os bond homolysis. There is also a significant body of literature on CO loss from diosmium and triosmium complexes. 

Molecular rearrangements of diynes coordinated to triosmium carbonyl clusters have been reported.179 Triosmium clusters can act as templates for the rearrangement of l,4-dipyridylbuta-l,3-diyne, leading to the formation of fused-ring organic products, in a manner similar to that previously reported for other 1,3-diyne compounds. 

Triosmium clusters with electron counts of 46, 48, 49, 50, or 52 have been described (see Table I). The 49-electron system [Os3(CO)12] appears unique and has so far only been characterized by its esr spectrum (50). The 44-electron compound Os3(CO)10 has been considered as a reaction intermediate but without substantiating evidence (51). In established cases the varying... 

Os3(CO)I2, Os3H2(CO), t(53-55), and most other triosmium clusters Very common... 

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