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Tp ligands : ウィキペディア英語版
Trispyrazolylborate

In inorganic chemistry, the trispyrazolylborate ligand, abbreviated Tp, is an anionic tridentate and tripodal ligand. Trispyrazolylborate refers specifically to the anion (), but the term trispyrazolylborate refers to derivatives substituted at on the pyrazolyl rings. This family of compounds are sometimes called scorpionate ligands.〔Trofimenko, S., "Scorpionates: genesis, milestones, prognosis", Polyhedron, 2004, 23, 197-203. 〕〔Trofimenko, S., "Recent advances in poly(pyrazolyl)borate (scorpionate) chemistry", Chem. Rev., 1993, 93, 943-80. 〕
==Tp ligands==

As suggested by the resonance structures, the nitrogen centers that are not bonded to boron are basic. These centers bind to three adjacent sites of a metal such that the simple adducts have C3v symmetry. The facial bonding mode is reminiscent of cyclopentadienyl ligands, although the ligand field stabilization energy of Tp is weaker as indicated by the fact that Fe(Tp)2 is a spin-crossover complex whereas ferrocene is low-spin.
The Tp ligands are usually prepared from the reaction of pyrazole with potassium borohydride:〔S. Trofimenko ”Poly(1-Pyrazolyl)Borates, Their Transition-Metal Complexes, and Pyrazaboles” Inorganic Syntheses, 1970, Volume 12, p 99-109. 〕
:KBH4 + 3 C3H3N2H → K() + 3H2
Intermediates include the monopyrazolylborate (()) and the bispyrazolylborate (()). KTp (m.p. 188-189 °C) is a colourless solid that soluble in polar solvents.

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