page_title: Potassium tris(3,5-dimethyl-1-pyrazolyl)borate
section_title: Role as ligand
hierarchical_section_title: Potassium tris(3,5-dimethyl-1-pyrazolyl)borate / Role as ligand
caption_attribution_description: English: structure of generic Tp*M complex
context_page_description: Potassium tris(3,5-dimethyl-1-pyrazolyl)borate, abbreviated KTp*, is the potassium salt of the anion HB((CH₃)₂C₃N₂H)₃. Tp*⁻ is a tripodal ligand that binds to a metal in a facial manner, more specifically a Scorpionate ligand. KTp* is a white crystalline solid that is soluble in polar solvents, including water and several alcohols.
context_section_description: The active binding sites in Tp*⁻ are the three nitrogen centers that are not bonded to the boron. Although more weakly binding than cyclopentadienyl ligands, Tp*⁻ is still a tightly coordinating. The benefit of Tp*⁻ over its sister compound Tp⁻ is the addition of the methyl groups on the pyrazolyl rings, which increases the steric hindrance of the ligand enough that only one Tp*⁻ can bind to a metal. This leaves the remaining coordination sites available for catalysis.
caption: Structure of generic Tp*M complex illustrating the steric protection afforded by the methyl groups.
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