Inorganic synthesis study reveals mixed scorpionate transition metal complexes, highlighting persistent B–H agostic interactions across various coordination geometries.
Scorpionate chemistry has long featured sandwich complexes with two trispyrazolylborate (Tp) or two bispyrazolylborate (Bp) ligands coordinated to a transition metal. Less common are complexes in which one Tp and one Bp ligand are coordinated to the metal. We report herein five such complexes of Ni II , Mn II , Co II , or Fe II involving Tp and Bp ligands comprising either 3‐phenyl‐4‐cyanopyrazole or 3‐phenylpyrazole, as well as a related Co II complex with two Tp ligands, one of which is coordinated in a κ 2 fashion. All complexes feature an agostic interaction with a B–H hydrogen atom.
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Kadel et al. (2016) studied this question.
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