title: A second monoclinic polymorph of {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.
abstract: The title compound, [Co(C(10)H(10)BF(6)N(4))(C(15)H(13)BF(9)N(6))], is a polymorph of the previously reported neutral cobalt(II) complex [Stibrany & Potenza (2010 ▶). Acta Cryst. E66, m506-m507], which contains one each of the monoanionic ligands, bis-[5-methyl-3-(trifluoro-meth-yl)pyrazol-1-yl]borate (Bp) and tris-[5-methyl-3-(trifluoro-meth-yl)pyrazol-1-yl]borate (Tp). A distorted octahedral coordination geometry of the Co(II) atom results from ligation of an H atom, which is part of an agostic B-H⋯Co inter-action [H⋯Co = 2.12 (3) Å], and by five imine N atoms, two from a Bp ligand and three from a Tp ligand. Weak intra- and inter-molecular C-F⋯π inter-actions with F⋯centroid distances ranging from 3.025 (4) to 3.605 (4) Å are observed.
authors.affiliation: Department of Chemistry and Chemical Biology, Rutgers, The State University of New Jersey, 610 Taylor Road, Piscataway, New Jersey 08854 USA.
authors.forename: Robert T
authors.initials: RT
authors.lastname: Stibrany
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Potenza