title: A tetra-gonal polymorph of bis-[hydro-tris-(pyrazol-1-yl)borato]iron(II).
abstract: The title compound, [Fe(C(9)H(10)BN(6))(2)], is a polymorph of a compound reported previously [Oliver et al. (1980 ▶). Inorg. Chem.19, 165-168]. In the previous report, the compound crystallized in the monoclinic space group P2(1)/c (Z = 4), whereas the crystal symmetry of the compound reported here is tetra-gonal (P4(2)/ncm, Z = 4). The mol-ecular structure is comprised of two hydro-tris-(1-pyrazol-yl)borate ligands (Tp(-)) and a central Fe(II) ion, which is coordinated by six pyrazole N atoms from two two Tp(-) ligands, yielding a distorted bipyramidal FeN(6) geometry. The complete molecule exhibits symmetry 2/m.
authors.affiliation: School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, Jiangsu Province,  People's Republic of China.
authors.forename: Zhong-Hai
authors.initials: ZH
authors.lastname: Ni
authors.forename: Guo-Ling
authors.initials: GL
authors.lastname: Li
authors.forename: Rui
authors.initials: R
authors.lastname: Ma
authors.forename: Jing
authors.initials: J
authors.lastname: Nie
references.citation: Inorg Chem. 2005 Mar 21;44(6):1852-66
references.pmid: 15762712
references.citation: Acta Crystallogr A. 2008 Jan;64(Pt 1):112-22
references.pmid: 18156677