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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 = pyridyl-pyrazole). To this end, a new ligand was synthesized in which two additional methyl groups are present. Its reaction with iron tri-fluoro-methane-sulfonate led to a pure sample of the title compound, as proven by X-ray powder diffraction. The asymmetric unit consists of one complex mol-ecule 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 mol-ecules into rows extending parallel to [010], there are no remarkable inter-molecular inter-actions.

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