D. Ellis, A. Franken, T. McGrath
Dec 8, 2000
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0
Influential Citations
6
Citations
Journal
Journal of Organometallic Chemistry
Abstract
In bromobenzene at reflux temperatures the compounds [Os 3 (CO) 12 ] and [N(PPh 3 ) 2 ][ nido -7-CB 10 H 13 ] yield a mixture of the anionic tri- and mono-osmium complexes [Os 3 (CO) 8 (η 5 -7-CB 10 H 11 )] − and [Os(CO) 3 (η 5 -7-CB 10 H 11 )] − , respectively, characterized as their [N(PPh 3 ) 2 ] + salts ( 2b , 3c ). Protonation of 2b with HBF 4 ·Et 2 O in thf (tetrahydrofuran) yields the hydrido cluster complex [Os 3 (μ-H)(CO) 8 (η 5 -7-CB 10 H 11 )] ( 4b ), whilst treatment of 2b in the same solvent with CuCl and PPh 3 in the presence of TlPF 6 affords the bimetallic complex [Os 3 (μ-H)(CO) 8 {η 5 -10-Cu(PPh 3 )-7-CB 10 H 10 }] ( 5b ). In contrast, the compounds [NHMe 3 ][ nido -7-CB 10 H 13 ] and [Os 3 (CO) 12 ] in refluxing bromobenzene give the novel zwitterionic complex [Os(CO) 3 {η 5 -5-(NMe 3 )-7-CB 10 H 10 }] ( 6 ). The structure of 6 was determined by X-ray crystallography, revealing an Os(CO) 3 moiety η 5 -ligated by the carborane cluster in which, unusually, the NMe 3 ligand is bonded to a boron atom on the upper B 5 belt.