(Picolinato-κ²N,O)[tris(2-isopropyl-1H-imidazol-4-yl-κN³)phosphane]cobalt(II) nitrate

Single crystals of the title compound, [Co(C₆H₄NO₂)(C₁₈H₂₇N₆P)]NO₃, were obtained from the reaction of nitrato[tris­(2-isopropyl­imidazol-4-yl)phosphane]cobalt(II) nitrate with picolinic acid in the presence of potassium tert-butoxide as base. The coordination polyhedron around the central Co^II ion is about halfway between square-pyramidal and trigonal-bipyramidal geometry. In the structure, the nitrate counter-anion is connected by N—H...O hydrogen bonding to the complex cation. Additionally, the complex cations form one-dimensional chains along [010] by hydrogen bonding of the NH group of an imidazole ring to the picolinate group of a neighbouring complex cation.