Accession Number : AD0770337

Title :   Proton Nmr Study of the Small Carboranes, 1,5-C2B3H5, CB5H7, 1,2-C2B4H6, 1,6-C2B4H6 and 2,4-C2B5H7.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA STATE UNIV LOS ANGELES DEPT OF CHEMISTRY

Personal Author(s) : Onak,Thomas ; Wan,Emma

Report Date : NOV 1973

Pagination or Media Count : 29

Abstract : Boron-11 decoupled proton nuclear magnetic resonance spectra and data are reported for the closo-carboranes 1,5-C2B3H5, CB5H7, 1,2-C2B4H6, 1,6-C2B4H6, and 2,4-C2B5H7. The proton nmr results are in agreement with the assignments for these carboranes and are compatible with previously obtained boron-11 nmr results. Fine structure, attributed to homonuclear long-range coupling, is observed in the decoupled spectrum of each of these closed polyhedral compounds. An estimate of orbital hybridization in C2B3H5 from coupling data indicates that most of the cage-orbital s-character is to be found in the C-B bonds and very little in the B-B bonds. Chemical shift assignments are made. (Modified author abstract)

Descriptors :   *Carboranes, *Nuclear magnetic resonance, Spectrum analysis, Molecular structure, Spectra, Coupling(Interaction), Pentaboranes, Chemical equilibrium, Molecular orbitals

Subject Categories : Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE