Abstract
AbstractThe three‐component reaction of [(η5‐C5H5)Co(η5‐(CEt)2(BEt)2CMe)]−, CoCl2 and B9H−14 (7) yields the triple‐decker complex [(η5‐C5H5)Co{μ,η5‐(CEt)2(BEt)2CMe}‐6‐Co(B9H13)] (8) with a terminal B9H13 ligand contaning two cobalt–boron‐bridging hydrogen atoms. Analogously, (6‐H)−, CoCl2, and arachno‐6‐SB9H−12 (10) react to give the triple‐decker [(η5‐C5H5)Co{μ,η5‐(CEt)2(BEt)2CMe}‐1‐Co‐2‐(SB9H9)] (11). The analogous reaction with the heteroboranyl anion arachno‐6,8‐S2B7H8− leads to the loss of one boron atom, forming the air‐stable triple‐decker complex [(η5‐ C5H5)Co{μ,η5‐(CEt)2(BEt)2CMe}‐7‐Co‐6,8‐(S2B6H8)] (12). The X‐ray structure determination shows that the dithiacobaltaborane fragment in 12 has an arachno cluster geometry. The three‐component reaction of (6‐H, CoCl2, and arachno‐2,3‐S2B9H10− yields the expected triple‐decker [(η5‐C5H5)Co{μ,η5‐(CEt)2(BEt)CMe}Co‐6,8‐(S2B9H9)] (15), and surprisingly the sandwich complex (η5‐C5H5)Co‐6,8‐(S2B9H9) (16). The constitutions of the new compounds are based on NMR and MS data. A rule is described regarding the electron donation of heteroboranyl cluster ligands in metal complexes.
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