An article Crystal structure of bis{(3,5-dimethylpyrazol-1-yl)dihydro[3-(pyridin-2-yl)pyrazol-1-yl]borato}iron(II) WOS:000569355400017 published article about SPIN-CROSSOVER; MAGNETIC-PROPERTIES; IRON(II) COMPLEXES; STATE; POLYMORPHISM; TEMPERATURE; TRANSITION; PYRAZOLYL; CHEMISTRY; CONTACT in [Ossinger, Sascha; Naether, Christian; Tuczek, Felix] Christian Albrechts Univ Kiel, Inst Anorgan Chem, Max Eyth Str 2, D-24118 Kiel, Germany in 2020.0, Cited 44.0. Recommanded Product: 67-51-6. The Name is 3,5-Dimethyl-1H-pyrazole. Through research, I have a further understanding and discovery of 67-51-6
The structure determination of [Fe(C13H15BN5)(2)] was undertaken as part of a project on the modification of the recently published spin-crossover (SCO) complex [Fe{H2B(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 {H2B(3,5-(CH3)(2)-pz)(pypz)}(-) ligands. The Fe-N bond lengths range between 2.1222 (13) and 2.3255 (15) angstrom, compatible with Fe-II in the high-spin state, which was also confirmed by magnetic measurements. Other than a very weak C-H center dot center dot center dot N non-classical hydrogen bond linking individual molecules into rows extending parallel to [010], there are no remarkable intermolecular interactions.
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Reference:
Pyrazole – Wikipedia,
,Pyrazoles – an overview | ScienceDirect Topics