Abstract
The reactions of the pentamethylcyclopentadienyl-osmium compound Cp ∗Os(NO)Br 2 ( 1) with Na 2S 4 and (NEt 4) 2Se 6 in dimethyl- formamide solution lead to mononuclear tetrachalcogenido complexes Cp ∗ Os(NO) (E 4) (E = S ( 2a), Se ( 2b)), whereas binuclear products Cp 2 ∗Os 2(NO) 2(μ-E) 2 (E = S ( 3a), Se ( 3b), Te ( 3c)) are obtained from the reactions of 1 with Li 2 E in tetrahydrofuran solution. Dechalcogenation of 2a,b using tri(n-butyl)phosphane gives 3a,b. The molecular geometry of Cp ∗ Os(NO)(Se 4) ( 2b) has been determined by an X-ray crystal structure analysis which confirms the presence of a non-planar cyclotetraselenido chelate ligand.
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