4-Fold Protonation of Tetracyanometalates in Superacids: Hydrogen and π-Hole Bonding in the Solid State.

ABSTRACT: Reaction of the group 10 tetracyanometalates K₂[M^II(CN)₄] (M = Ni, Pd, Pt) and tetracyanoaurate K[Au^III(CN)₄] with an excess of the superacid HF/SbF₅ results in the formation and structural characterization of homoleptic hydrogen isocyanide complexes [M^II(CNH)₄][SbF₆]₂ (M = Ni, Pd, Pt) and [Au^III(CNH)₄][SbF₆]₃·2HF, respectively. The intermolecular interactions in the solid state are dominated by strong H···F bonded networks as well as weak contacts between the fluorine atoms and C≡N groups, which are more pronounced for the more electrophilic trication. Additionally, M···F contacts below the sum of van der Waals radii for all compounds ar

SUBMITTER: Streit TN 

PROVIDER: S-EPMC12801322 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature