Tricarba-'closo'-octaborane(7), a Polyhedral Carborane Containing a Bare Carbon Atom.
Abstract
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1971
- Accession Number
- AD0729264
Entities
People
- Martin L. Thompson
- Russell N. Grimes
Organizations
- University of Virginia