AI Article Synopsis
- Borolides (BC) act as dianionic counterparts to monoanionic cyclopentadienides, both being six-π-electron donors but differing in their electronic structures in transition metal complexes.
- The Ni(iPrNBCPh) complex shows a unique geometry with a ∼90° angle between its Ni-B-N planes, suggesting a significant contribution from resonance structures with Ni bonded to two BC ligands.
- The compound undergoes two one-electron oxidation processes within a narrow potential range (<0.2 V), which is notably different from the wider potential separations typically found in metallocenes, leading to a discussion of possible underlying causes for this behavior.
Article Abstract
Borolides (BC) can be considered as dianionic heterocyclic analogues of monoanionic cyclopentadienides. Although both are formally six-π-electron donors, we herein demonstrate that the electronic structure of their corresponding transition metal complexes differs significantly, leading to altered properties. Specifically, the 18-electron sandwich complex Ni(iPrNBCPh) () features an ∼90° angle between the Ni-B-N planes and is best described as a combination of three limiting resonance structures with the major contribution stemming from a formally Ni species bound to two monoanionic radical (BC) ligands. Compound displays two sequential one-electron oxidation events over a small potential range of <0.2 V, which strikingly contrasts the large potential separations between redox partners in the family of metallocenes, and the potential reasons for this unusual observation are discussed.
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| http://dx.doi.org/10.1021/acs.inorgchem.1c01845 | DOI Listing |
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