Tricarba-'closo'-octaborane(7), a Polyhedral Carborane Containing a Bare Carbon Atom.
VIRGINIA UNIV CHARLOTTESVILLE DEPT OF CHEMISTRY
Pagination or Media Count:
A new carborane has been isolated from the pyrolysis of mu-SiH3- or 4-SiH3-2,3-C2B4H7 at 220-250C and characterized as closo-C3B5H7, a polyhedron isoelectronic with the known C2B6H8 and B8H8-2 species and containing a carbon atom having no attached hydrogen. The molecular formula is established from the chemical ionization mass spectrum, boron-11 and proton NMR spectra, vapor density, and infrared spectrum. From NMR evidence, a dodecahedral structure which undergoes rapid intramolecular rearrangement in solution is proposed. The carborane is thermally stable to at least 250C but is essentially 100 converted to closo-2,4-C2B5H7 by pyrolysis at 400C or by electron-impact mass spectrometry. Author
- Inorganic Chemistry