Abstract
Exposure of dilute solutions of trimethylamine–boron hydride (Me3N–BH3) in freon (CFCl3) at 77 K to ionizing radiation gave a radical cation whose EPR spectrum was that expected for the parent radical cation. This resembled those obtained for the BH4 radical previously studied, having a nearly isotropic hyperfine coupling to boron, and a large coupling to two equivalent protons. The possibility that this might be a σ1-radical the SOMO being the N–B σ-bond is dismissed: the favoured structure places the hole on two hydrogens and on boron only.
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