{Bis[5-methyl-3-(trifluoro-meth-yl)pyrazol-1-yl]borato}{tris-[5-methyl-3-(trifluoro-meth-yl)pyrazol-1-yl]borato}cobalt(II): a structure containing a B-H⋯Co agostic inter-action.

The title compound, [Co(C(10)H(10)BF(6)N(4))(C(15)H(13)BF(9)N(6))], is a neutral Co(II) complex which contains one each of the anionic ligands, bis-(3-trifluoro-methyl-5-methyl-pyrazol-1-yl)borate (Bp) and tris-(3-trifluoro-methyl-5-methyl-pyrazol-1-yl)borate (Tp). A distorted octa-hedral coordination geometry results from ligation of an H atom, which is part of an agostic B-H⋯Co inter-action (H⋯Co = 2.17 Å), and by five imine N atoms, two from a Bp ligand and three from a Tp ligand. In the crystal, mol-ecules form layers parallel to the (10) planes, and the layers are linked along the a axis by C-H⋯F hydrogen bonds. An intra-molecular C-H⋯F inter-action also occurs.