Structure and Properties of [Cr^IIIF(NCMe)₅](BF₄)₂·MeCN: A Nonaqueous Source of Cr^IIIF²⁺ and a Building Block for New Prussian-Blue-Like Magnetic Materials

[Cr^IIIF(NCMe)₅](BF₄)₂·MeCN (1) was synthesized from a prolonged dissolution of [Cr^III(NCMe)₆](BF₄)₃ in MeCN via fluoride abstraction from BF₄⁻. Complex 1 exhibits a crystal field splitting, Δ_o, of 17 470 cm⁻¹ and is a nonaqueous source of Cr^IIIF²⁺. The reaction of 1 with (NEt₄)₃[Cr^III(CN)₆] formed a new Prussian-blue-like magnetic material of (NEt₄)_0.04[Cr^IIIF]_1.54[Cr^III(CN)₆](BF₄)_0.12·0.10(MeCN) (2) composition. Complex 2 magnetically orders at a critical temperature, T_c, of 85 K and at 2 K exhibits magnetic hysteresis with a coercive field, H_cr, of 60 Oe and a remanent magnetization, M_rem, of 1880 emuOe/mol.