A second monoclinic polymorph of {bis[5-methyl-3-(trifluoromethyl)pyrazol-1-yl]borato}{tris[5-methyl-3-(t rifluoromethyl)pyrazol-1-yl]borato}cobalt(II): a structure containing a B-H center dot center dot center dot Co agostic interaction

作者：Stibrany Robert T^*; Potenza Joseph A

来源：Acta Crystallographica Section E-Structure Reports Online, 2011, 67: M911-U874.

DOI：10.1107/S1600536811021994

The title compound, [Co(C10H10BF6N4)(C15H13BF9N6)], 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-(trifluoromethyl)pyrazol-1-yl]borate (Bp) and tris[5-methyl-3-(trifluoromethyl)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 center dot center dot center dot Co interaction [H center dot center dot center dot Co = 2.12 (3) angstrom], and by five imine N atoms, two from a Bp ligand and three from a Tp ligand. Weak intra- and intermolecular C-F center dot center dot center dot pi interactions with F center dot center dot center dot centroid distances ranging from 3.025 (4) to 3.605 (4) angstrom are observed.

• 出版日期2011-7