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A Crystalline NiX6 Complex
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DOI：10.1021/jacs.4c12125.png)
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Abstract
En 中文
High-valent nickel species are implicated as intermediates in industrially relevant chemical transformations and in the catalytic cycles of metalloenzymes. Although a small number of tetravalent NiX4 complexes have been crystallographically characterized, higher nickel valence states have not been identified. Here we report a stable, crystalline NiX6 complex, Ni(BeCp)6 (1; cyclopentadienyl anion (Cp)), formed by the insertion of zerovalent nickel into three Be-Be bonds. This 16-electron species features an inverted ligand field, is diamagnetic, and exhibits C 3v symmetry, on account of the lifting of Ni 4p-orbital degeneracy in this molecular geometry. Single-crystal X-ray diffraction and quantum chemical calculations both reveal a toroidal band of electron density perpendicular to the C 3 axis of the complex, which may be attributed to delocalized, multicenter aromatic NiBe6 bonding.
Keywords:
ELECTRON-DENSITY
TRANSITION-METAL
OXIDATION-STATE
BOND
REACTIVITY
MOLECULES
CHEMISTRY
COMPOUND
VALENCE
BORYL
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15.6
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20.0W
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60.2W
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