Negative Ion Mass Spectrometry of Closo-Carboranes.
CALIFORNIA STATE COLL LOS ANGELES DEPT OF CHEMISTRY
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The negative ion mass spectra of the small closo-carbonanes, 1,5-C2B3H5, 1,2-C2B4H6, 1,6-C2B4H6, and 2,4-C2B5H7 exhibit much more intense P-1 ions than parent ions, indicating the ease with which conjugate base anions of these cage compounds are formed. Ionization efficiency diagrams were gathered for the parent regions as well as for important fragments. These suggest that negative ions of closo-carbonanes are formed with somewhat difficulty than those of nido-carboranes which appears to reflect the lack of bridge hydrogens in the former. Percentage composition of carborane mixtures have been determined using a combination of mass spectral patterns and energy dependency information. Author
- Atomic and Molecular Physics and Spectroscopy