Crystal structure of bis­{(3,5-di­methyl­pyrazol-1-yl)di­hydro­[3-(pyridin-2-yl)pyrazol-1-yl]­borato}iron(II)

The structure determination of [Fe(C(13)H(15)BN(5))(2)] was undertaken as part of a project on the modification of the recently published spin-crossover (SCO) complex [Fe{H(2)B(pz)(pypz)}(2)] (pz = pyrazole, pypz = pyridyl­pyrazole). To this end, a new ligand was synthesized in which two additional methyl groups are present. Its reaction with iron tri­fluoro­methane­sulfonate led to a pure sample of the title compound, as proven by X-ray powder diffraction. The asymmetric unit consists of one complex mol­ecule in a general position. The Fe(II) atom is coordinated by two tridentate N-binding {H(2)B(3,5-(CH(3))(2)-pz)(pypz)}(−) ligands. The Fe—N bond lengths range between 2.1222 (13) and 2.3255 (15) Å, compatible with Fe(II) in the high-spin state, which was also confirmed by magnetic measurements. Other than a very weak C—H⋯N non-classical hydrogen bond linking individual mol­ecules into rows extending parallel to [010], there are no remarkable inter­molecular inter­actions.