While assessing the donor strength of tris(phosphinomethyl)phenylborates towards zerovalent group VI metals by cyclic voltammetry, the prospect of chemical oxidation of these d6 complexes to d5 radicals was suggested. Our subsequent successes in isolating and fully characterizing zwitterionic chromium(I) tricarbonyl complexes of tris(phosphinomethyl)phenylborates will be detailed in this oral presentation. The featured complexes are isoelectronic with long known [Cr(CO)3(PR3)3]+ and [Cr(CO)3(triphos)]+ that have defied complete characterization on the basis of their thermal instablilty at ambient temperature. Complexes to be presented include the first chromium(I) tricarbonyl tris(phosphine) units to be structurally characterized, and the only known bimetallics containing cationic Cr(CO)3P3 units.

Zwitterionic chromium(I)-centered radicals: Isolable cousins of thermally unstable d5 tricarbonyl complexes

2019 Spring National Meeting

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