Crystal Structure of a Dinuclear Co Complex with Doubly Bridged Fluorides: Di-μ-fluoride Bis{(2-pyridylmethyl)bis(2-quinolylmethyl)amine} Dicobalt(II) Bis(tetrafluoroborate), [Co₂(μ-F)₂(pbqa)₂](BF₄)₂

Abstract

The reaction of a methanol solution containing Co(BF₄)₂·6H₂O and (2-pyridylmethyl)bis(2-quinolylmethyl)amine (pbqa) afforded a dinuclear cobalt(II) complex, [Co₂(μ-F)₂(pbqa)₂](BF₄)₂, where the two metal centers are doubly bridged by two fluoride ions. BF₄⁻ is a fluoride source. A temperature-dependent magnetic susceptibility measurement reveal that a strong spin orbit contribution with a zero-field splitting effect of two high-spin Co(II) ions. It crystallizes in the monoclinic space group C2/c with a = 24.9600(9)Å, b = 11.1533(3)Å, c = 20.0575(6)Å, α = 90°, β = 109.439(4)°, γ = 90°, V = 5265.4(3)ų, D_calc = 1.535 g/cm³, and Z = 4. The R1 [I > 2σ(I)] and wR2 (all data) values are 0.0403 and 0.1018, respectively, for all 7897 independent reflections.