E.S.R. spectra of diboranyl radicals in the solid states

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Abstract
E.S.R. Spectra of the radicals produced from the γ-irradiated diborane (6) in polycrystal or single crystal have been investigated. From the analysis of the results of the single crystal, the radical was identified as neutral diboranyl, ·B2H5, produced by extracting one of the two bridging hydrogen atoms of diborane. The major portion of the spin density on the radical is equally shared by the two boron atoms, a considerable portion exists on the bridging hydrogen atom, and a small portion with negative sign on the four terminal hydrogens. The orbitals of the unpaired electron on the two borons are in the same plane at an angle of 73°. These results are in good agreement with those from INDO calculation for the radicals. The structure of the radical is discussed in comparison with some other radicals having a similar structure.

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