A tetragonal polymorph of bis-[hydro-tris-(pyrazol-1-yl)borato]iron(II)

Abstract

The title compound, [Fe(C 9H 10BN 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 FeN6 geometry. The complete molecule exhibits symmetry 2/m.