Abstract
Reaction of a tethered triamine ligand with Bi(NMe2 )3 gives a Bi triamide, for which a BiI electronic structure is shown to be most appropriate. The T-shaped geometry at bismuth provides the first structural model for edge inversion in bismuthines and the only example of a planar geometry for pnictogen triamides. Analogous phosphorus compounds exhibit a distorted pyramidal geometry because of different Bi-N and P-N bond polarities. Although considerable BiI character is indicated for the title Bi triamide, it exhibits reactivity similar to BiIII electrophiles, and expresses either a vacant or a filled p orbital at Bi, as evidenced by coordination of either pyridine N-oxide or W(CO)5 . The product of the former shows evidence of coordination-induced oxidation state change at bismuth.
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