Direct Insertion of Transition Metals into Polyhedral Carboranes. Structurally Novel Mono-, Di-, and Trimetallic Small Cage Systems.
VIRGINIA UNIV CHARLOTTESVILLE DEPT OF CHEMISTRY
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Metallocarboranes of iron, cobalt and nickel have been prepared by the direct reaction of the small polyhedral carboranes 1,5-C2B3H5, 1,6-C2B4H6, or 2,4-C2B5H7 with organometallic and metal carbonyl reagents in the gas phase or in solution, without the use of a prior cage-opening step. Novel 6-vertex cages as well as 7-vertex species were obtained, including mono-, di-, and trimetallocarborane species. Molecular structures were assigned to the new compounds on the basis of boron-11 and proton nmr spectra. Fine structure in the carborane CH proton nmr signals exhibited by several of the cobaltacarborane species was interpreted on the basis of H-C-B-H proton-proton coupling. Modified author abstract
- Inorganic Chemistry
- Organic Chemistry