Bis(1,4-di-tert-butyl-1,4-diazabutadiene)gallium is not a gallium(II) compound

Abstract
The recently reported paramagnetic compounds (dbdab)2M (dbdab = 1,4-di-tert-butyl-1,4-diazabutadiene, M = Ga, Al), both contain trivalent metal bound to one singly and one doubly reduced dbdab ligand; the larger metal hyperfine coupling in the EPR spectrum of the gallium complex is not due to a gallium(II) oxidation state, it is simply a result Of the quite large isotropic hyperfine coupling constants of 69Ga and 71Ga as demonstrated previously for the related radicals (bpy˙)MIIIMe2(bpy = 2,2′-bipyridine).

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