1,2-Dimethyl-1,2-Disila-Closo-Dodecaborane(12), A Silicon Analog of an Ortho-Carborane: Synthesis; X-Ray Crystal Structure; NMR, Vibrational and Photoelectron Spectra; Bonding
Abstract
The reaction of (CH3)2Si(NMe2)2 with BlOH14 Yields a polymer, BlOH12. Me2NSi(CH3)2NMe2n, whose pyrolysis in a stream of ammonia gives hexagonal boron nitride containing 'a' little silicon nitride. In contrast, CH3(H)Si(NMe2)2 reacts with BlOH14 to give 1,2-dimethyl-1,2-disila-closo-dodecaborane(12) (DMSB) , an air-sensitive solid, the structure of whose 1:1 benzene solvate was determined by X-ray diffraction. This compound crystallizes in the space group P ccn ( 56) with a 10.081(1) b = 10 . 666(8) A, c = 16.130(5) A, V = 1734(2)A3 and Z = 4. Final R = 0.044 and RW = 0.058. The 1H, 13C, 29Si and 11B NMR spectra and mass spectrum of DMSB are reported. Its vibrational spectrum (Raman, 5-3600 cm-1 ; IR, 200-3600 cm-1) has been measured and compared with that of ortho- carborane. A study of its He(I) photoelectron spectrum led to the conclusion that DMSB is the most electro rich cluster of type XYB1OH1O with two adjacent main group element centers known.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 20, 1993
- Accession Number
- ADA264709
Entities
People
- Dietmar Seyferth
- Klaus D. Buechner
- Lars Wesemann
- William M. Davis
- William S. Rees Jr.
Organizations
- Massachusetts Institute of Technology