The Structures of the Decaphenylmetallocenium Cations of Chromium and Cobalt

Abstract

Decaphenylchromocenium and decaphenylcobaltocenium cations [M(η⁵-C₅Ph₅)₂]⁺, M = Cr and Co, were synthesized by oxidation of the corresponding neutral decaphenylchromocene and decaphenylcobaltocene respectively with nitrosyl tetrafluoroborate. The complexes are air-stable and were fully characterized; decaphenylchromocenium tetrafluoroborate (1) and decaphenylcobaltocenium tetrafluoroborate (2) were structurally characterized by X-ray crystallography. Crystals of (1) (as a water/methylene chloride solvate), C_70·5H₅₀BClCrF₄O_0·5, M 1079·42, are triclinic, space group P ^-1 (No. 2), a 13·634(5), b 17·424(5), c 13·298(4) Å, α 106·45(2), β 101·83(3), γ 74·56(2)°, Z 2. Crystals of (2) (as a water/methylene chloride solvate), C_70·5H₅₀BClCoF₄O_0·5, M 1086·36, are triclinic, space group P^-1 (No. 2), a 13·633(2), b 17·683(3), c 13·255(3) Å, α 107·95(1), β 102·71(1), γ 73·23(1)°, Z2.